This is a multi-part message in MIME format.
My new laptop is set up to dual boot and has a clean Gentoo install as
the second operating system.  It looks like there may be an issue with
the /usr Logical Volume (LV) somewhere between LVM, initramfs and udev. 
Only the base system has been installed and updated (no desktop).

The issue is the /usr logical volume is not mounted as expected. After
booting without the livecd:
  * The df -h command show /usr on /dev/dm-1 and not
/dev/mapper/vg0-usr like the in the fstab.
  * My expectation is it should follow the other LVs (home, var, opt,
vm) and be in the vg0 Volume Group on /dev/mapper .
  * However the mount /usr command indicates that it is mounted
correctly:  mount: /usr: /dev/mapper/vg0-usr already mounted or mount
point busy.

Is there something off here or is this correct behavior?

The laptop is a new HP Envy x360, 2-in-1 Flip Laptop, 15.6" Full HD Touchscreen, AMD Ryzen 7 5700U Processor, 64GB RAM and 1TB PCIe SSD.

Below is the /etc/fstab and output from lsblk, df -h and the links in
the volume group after booting to the livecd and booting to the ssd.

Thank you

#
*****************************************************************************
# /etc/fstab:  This is a dual boot system (Windows 11 & Gentoo), the
# same results occurred using straight mount points, LABEL and UUID.
#
*****************************************************************************
# <fs>          <mountpoint>    <type> <opts>                     
<dump/pass>
#/dev/nvme0n1p1 /efi            vfat noauto,noatime                    1 2
#/dev/nvme0n1p2 /
#/dev/nvme0n1p3 /Win11
#/dev/nvme0n1p4 /Win11Data
#/dev/nvme0n1p5 /Win11Recovery
/dev/nvme0n1p6  /boot           ext2 defaults,noatime                  0 2
/dev/nvme0n1p7  none            swap sw                                0 0
/dev/nvme0n1p8  /               ext4 defaults,noatime,discard          0 1
/dev/nvme0n1p9  /lib/modules    ext4 defaults,noatime,discard          0 1
/dev/nvme0n1p10 /tmp            ext4 defaults,noatime,discard          0 2

#/dev/mapper/vg0-usr     /usr    ext4 defaults,noatime,discard          0 0
#/dev/mapper/vg0-home    /home   ext4 defaults,noatime,discard          0 1
#/dev/mapper/vg0-opt     /opt    ext4 defaults,noatime,discard          0 1
#/dev/mapper/vg0-var     /var    ext4 defaults,noatime,discard          0 1
#/dev/mapper/vg1-vm      /vm     ext4 noauto,noatime,discard,user       0 1

#Use blkid /dev/mapper/* to get the LABEL and UUID (quotes cause errors). LABEL=usr   /usr    ext4    defaults,noatime,discard          0 0
LABEL=home  /home   ext4    defaults,noatime,discard          0 1
LABEL=opt   /opt    ext4    defaults,noatime,discard          0 1
LABEL=var   /var    ext4    defaults,noatime,discard          0 1
LABEL=vm    /vm     ext4    noauto,noatime,discard,user       0 1

#UUID=d9237094-6589-4e90-989d-17bfe74082a4 /usr    ext4 defaults,noatime,discard          0 0 #UUID=53831f3e-6266-4186-a7e1-90ecd027b981 /home   ext4 defaults,noatime,discard          0 1 #UUID=cbdfcbb5-dff1-4b21-8eca-d1684b621fb2 /opt    ext4 defaults,noatime,discard          0 1 #UUID=d43c8c7a-1a83-42f7-958d-9402e7bcc48f /var    ext4 defaults,noatime,discard          0 1 #UUID=95ea1fcc-df9d-4c0b-bce4-a979f8430728 /vm     ext4 noauto,noatime,discard,user       0 1

/dev/cdrom      /mnt/cdrom      auto rw,exec,noauto,user               0 0


#
*****************************************************************************
# Booting to the livecd and before chroot, all looks good.
#
***************************************************************************** livecd ~ # lsblk
NAME         MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS loop0          7:0    0 385.7M  1 loop /mnt/livecd sda            8:0    1     2G  0 disk └─sda1         8:1    1     2G  0 part /mnt/cdrom nvme0n1      259:0    0 931.5G  0 disk
├─nvme0n1p1  259:1    0   100M  0 part
├─nvme0n1p2  259:2    0    16M  0 part
├─nvme0n1p3  259:3    0  52.2G  0 part
├─nvme0n1p4  259:4    0  40.2G  0 part
├─nvme0n1p5  259:5    0 608.6M  0 part
├─nvme0n1p6  259:6    0   2.8G  0 part /mnt/gentoo/boot ├─nvme0n1p7  259:7    0   4.7G  0 part [SWAP]
├─nvme0n1p8  259:8    0   9.3G  0 part /mnt/gentoo
├─nvme0n1p9  259:9    0   3.7G  0 part /mnt/gentoo/lib/modules ├─nvme0n1p10 259:10   0   2.8G  0 part /mnt/gentoo/tmp ├─nvme0n1p11 259:11   0 186.3G  0 part
│ ├─vg0-usr  253:1    0    25G  0 lvm  /mnt/gentoo/usr
│ ├─vg0-var  253:2    0    20G  0 lvm  /mnt/gentoo/var
│ ├─vg0-home 253:3    0    80G  0 lvm  /mnt/gentoo/home
│ └─vg0-opt  253:4    0    20G  0 lvm  /mnt/gentoo/opt ├─nvme0n1p12 259:12   0 186.3G  0 part
│ └─vg1-vm   253:0    0   150G  0 lvm  /mnt/gentoo/vm ├─nvme0n1p13 259:13   0  93.1G  0 part
├─nvme0n1p14 259:14   0  93.1G  0 part
├─nvme0n1p15 259:15   0  46.6G  0 part
├─nvme0n1p16 259:16   0  46.6G  0 part
├─nvme0n1p17 259:17   0  46.6G  0 part
├─nvme0n1p18 259:18   0  46.6G  0 part
├─nvme0n1p19 259:19   0  46.6G  0 part
└─nvme0n1p20 259:20   0  23.5G  0 part

livecd ~ # df -h
Filesystem            Size  Used Avail Use% Mounted on none                   32G  704K   32G   1% /run udev                   10M     0   10M   0% /dev shm                    32G     0   32G   0% /dev/shm tmpfs                  32G   60M   32G   1% / /dev/sda1             2.0G  436M  1.6G  22% /mnt/cdrom /dev/loop0            386M  386M     0 100% /mnt/livecd cgroup_root            10M     0   10M   0% /sys/fs/cgroup /dev/nvme0n1p8        9.1G  915M  7.7G  11% /mnt/gentoo /dev/nvme0n1p6        2.8G  105M  2.6G   4% /mnt/gentoo/boot /dev/nvme0n1p9        3.6G  112M  3.3G   4% /mnt/gentoo/lib/modules /dev/nvme0n1p10       2.7G   32K  2.6G   1% /mnt/gentoo/tmp /dev/mapper/vg0-usr    25G  3.7G   20G  16% /mnt/gentoo/usr /dev/mapper/vg0-var    20G  2.4G   17G  13% /mnt/gentoo/var /dev/mapper/vg0-home   79G   24K   75G   1% /mnt/gentoo/home /dev/mapper/vg0-opt    20G   14M   19G   1% /mnt/gentoo/opt /dev/mapper/vg1-vm    147G   28K  140G   1% /mnt/gentoo/vm tmpfs                  32G     0   32G   0% /mnt/gentoo/dev/shm


#
*****************************************************************************
# Booting to the livecd and after chroot, all looks good.
#
***************************************************************************** (chroot) livecd # lsblk
NAME         MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS loop0          7:0    0 385.7M  1 loop
sda            8:0    1     2G  0 disk └─sda1         8:1    1     2G  0 part
nvme0n1      259:0    0 931.5G  0 disk
├─nvme0n1p1  259:1    0   100M  0 part
├─nvme0n1p2  259:2    0    16M  0 part
├─nvme0n1p3  259:3    0  52.2G  0 part
├─nvme0n1p4  259:4    0  40.2G  0 part
├─nvme0n1p5  259:5    0 608.6M  0 part
├─nvme0n1p6  259:6    0   2.8G  0 part /boot
├─nvme0n1p7  259:7    0   4.7G  0 part [SWAP]
├─nvme0n1p8  259:8    0   9.3G  0 part /
├─nvme0n1p9  259:9    0   3.7G  0 part /lib/modules
├─nvme0n1p10 259:10   0   2.8G  0 part /tmp
├─nvme0n1p11 259:11   0 186.3G  0 part
│ ├─vg0-usr  253:1    0    25G  0 lvm  /usr
│ ├─vg0-var  253:2    0    20G  0 lvm  /var
│ ├─vg0-home 253:3    0    80G  0 lvm  /home
│ └─vg0-opt  253:4    0    20G  0 lvm  /opt
├─nvme0n1p12 259:12   0 186.3G  0 part
│ └─vg1-vm   253:0    0   150G  0 lvm  /vm
├─nvme0n1p13 259:13   0  93.1G  0 part
├─nvme0n1p14 259:14   0  93.1G  0 part
├─nvme0n1p15 259:15   0  46.6G  0 part
├─nvme0n1p16 259:16   0  46.6G  0 part
├─nvme0n1p17 259:17   0  46.6G  0 part
├─nvme0n1p18 259:18   0  46.6G  0 part
├─nvme0n1p19 259:19   0  46.6G  0 part
└─nvme0n1p20 259:20   0  23.5G  0 part

(chroot) livecd # df -h
Filesystem            Size  Used Avail Use% Mounted on /dev/nvme0n1p8        9.1G  915M  7.7G  11% / /dev/nvme0n1p6        2.8G  105M  2.6G   4% /boot /dev/nvme0n1p9        3.6G  112M  3.3G   4% /lib/modules /dev/nvme0n1p10       2.7G   32K  2.6G   1% /tmp /dev/mapper/vg0-usr    25G  3.7G   20G  16% /usr /dev/mapper/vg0-var    20G  2.4G   17G  13% /var /dev/mapper/vg0-home   79G   24K   75G   1% /home /dev/mapper/vg0-opt    20G   14M   19G   1% /opt /dev/mapper/vg1-vm    147G   28K  140G   1% /vm cgroup_root            10M     0   10M   0% /sys/fs/cgroup udev                   10M     0   10M   0% /dev tmpfs                  32G     0   32G   0% /dev/shm none                   32G  704K   32G   1% /run



#
*****************************************************************************
# Booting to new system, the df -h does not shows /usr in
# the vg0 volume group under /dev/mapper.
#
***************************************************************************** newhost / # df -h
Filesystem            Size  Used Avail Use% Mounted on none                   32G  604K   32G   1% /run udev                   10M     0   10M   0% /dev tmpfs                  32G     0   32G   0% /dev/shm /dev/nvme0n1p8        9.1G  916M  7.7G  11% / */dev/dm-1              25G  3.9G   20G  17% /usr **  # This looks
wrong,**the expectation is that it would be /dev/mapper/vg0-usr .** *cgroup_root            10M     0   10M   0% /sys/fs/cgroup /dev/nvme0n1p6        2.8G  105M  2.6G   4% /boot /dev/nvme0n1p9        3.6G  112M  3.3G   4% /lib/modules /dev/nvme0n1p10       2.7G   32K  2.6G   1% /tmp /dev/mapper/vg0-home   79G   24K   75G   1% /home /dev/mapper/vg0-opt    20G  7.3M   19G   1% /opt /dev/mapper/vg0-var    20G  2.8G   16G  15% /var

newhost / # lsblk
NAME         MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
nvme0n1      259:0    0 931.5G  0 disk
├─nvme0n1p1  259:1    0   100M  0 part
├─nvme0n1p2  259:2    0    16M  0 part
├─nvme0n1p3  259:3    0  52.2G  0 part
├─nvme0n1p4  259:4    0  40.2G  0 part
├─nvme0n1p5  259:5    0 608.6M  0 part
├─nvme0n1p6  259:6    0   2.8G  0 part /boot
├─nvme0n1p7  259:7    0   4.7G  0 part [SWAP]
├─nvme0n1p8  259:8    0   9.3G  0 part /
├─nvme0n1p9  259:9    0   3.7G  0 part /lib/modules
├─nvme0n1p10 259:10   0   2.8G  0 part /tmp
├─nvme0n1p11 259:11   0 186.3G  0 part
│ ├─*vg0-usr  253:1    0    25G  0 lvm  /usr **  # This looks right.*
│ ├─vg0-var  253:2    0    20G  0 lvm  /var
│ ├─vg0-home 253:3    0    80G  0 lvm  /home
│ └─vg0-opt  253:4    0    20G  0 lvm  /opt
├─nvme0n1p12 259:12   0 186.3G  0 part
│ └─vg1-vm   253:0    0   150G  0 lvm
├─nvme0n1p13 259:13   0  93.1G  0 part
├─nvme0n1p14 259:14   0  93.1G  0 part
├─nvme0n1p15 259:15   0  46.6G  0 part
├─nvme0n1p16 259:16   0  46.6G  0 part
├─nvme0n1p17 259:17   0  46.6G  0 part
├─nvme0n1p18 259:18   0  46.6G  0 part
├─nvme0n1p19 259:19   0  46.6G  0 part
└─nvme0n1p20 259:20   0  23.5G  0 part

newhost / # ls -l /dev/vg0 /dev/vg1
/dev/vg0:
total 0
lrwxrwxrwx 1 root root 7 Apr  4 03:32 home -> ../dm-3
lrwxrwxrwx 1 root root 7 Apr  4 03:32 opt -> ../dm-4
lrwxrwxrwx 1 root root 7 Apr  4 03:32 *usr -> ../dm-1  # This looks right.* lrwxrwxrwx 1 root root 7 Apr  4 03:32 var -> ../dm-2

/dev/vg1:
total 0
lrwxrwxrwx 1 root root 7 Apr  4 03:32 vm -> ../dm-0

# mount /usr
mount: /usr: /dev/mapper/vg0-usr already mounted or mount point busy.

<html>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<body>
My new laptop is set up to dual boot and has a clean Gentoo install
as the second operating system.  It looks like there may be an issue
with the /usr Logical Volume (LV) somewhere between LVM, initramfs
and udev.  Only the base system has been installed and updated (no
desktop).<br>
<br>
The issue is the /usr logical volume is not mounted as expected. 
After booting without the livecd:<br>
  * The df -h command show /usr on /dev/dm-1 and not
/dev/mapper/vg0-usr like the in the fstab.<br>
  * My expectation is it should follow the other LVs (home, var,
opt, vm) and be in the vg0 Volume Group on /dev/mapper .<br>
  * However the mount /usr command indicates that it is mounted
correctly:  mount: /usr: /dev/mapper/vg0-usr already mounted or
mount point busy.<br>
<br>
Is there something off here or is this correct behavior?<br>
<br>
The laptop is a new HP Envy x360, 2-in-1 Flip Laptop, 15.6" Full HD
Touchscreen, AMD Ryzen 7 5700U Processor, 64GB RAM and 1TB PCIe SSD.<br>
<br>
Below is the /etc/fstab and output from lsblk, df -h and the links
in the volume group after booting to the livecd and booting to the
ssd.<br>
<br>
Thank you<br>
<br>
# *****************************************************************************<br>
# /etc/fstab:  This is a dual boot system (Windows 11 &amp; Gentoo),
the<br>
# same results occurred using straight mount points, LABEL and UUID.<br>
# *****************************************************************************<br>
# &lt;fs&gt;          &lt;mountpoint&gt;    &lt;type&gt; 
&lt;opts&gt;                      &lt;dump/pass&gt;<br>
#/dev/nvme0n1p1 /efi            vfat   
noauto,noatime                    1 2<br>
#/dev/nvme0n1p2 /<br>
#/dev/nvme0n1p3 /Win11<br>
#/dev/nvme0n1p4 /Win11Data<br>
#/dev/nvme0n1p5 /Win11Recovery<br>
/dev/nvme0n1p6  /boot           ext2   
defaults,noatime                  0 2<br>
/dev/nvme0n1p7  none            swap   
sw                                0 0<br>
/dev/nvme0n1p8  /               ext4   
defaults,noatime,discard          0 1<br>
/dev/nvme0n1p9  /lib/modules    ext4   
defaults,noatime,discard          0 1<br>
/dev/nvme0n1p10 /tmp            ext4   
defaults,noatime,discard          0 2<br>
<br>
#/dev/mapper/vg0-usr     /usr    ext4   
defaults,noatime,discard          0 0<br>
#/dev/mapper/vg0-home    /home   ext4   
defaults,noatime,discard          0 1<br>
#/dev/mapper/vg0-opt     /opt    ext4   
defaults,noatime,discard          0 1<br>
#/dev/mapper/vg0-var     /var    ext4   
defaults,noatime,discard          0 1<br>
#/dev/mapper/vg1-vm      /vm     ext4   
noauto,noatime,discard,user       0 1<br>
<br>
#Use blkid /dev/mapper/* to get the LABEL and UUID (quotes cause
errors).<br>
LABEL=usr   /usr    ext4    defaults,noatime,discard          0 0<br>
LABEL=home  /home   ext4    defaults,noatime,discard          0 1<br>
LABEL=opt   /opt    ext4    defaults,noatime,discard          0 1<br>
LABEL=var   /var    ext4    defaults,noatime,discard          0 1<br>
LABEL=vm    /vm     ext4    noauto,noatime,discard,user       0 1<br>
<br>
#UUID=d9237094-6589-4e90-989d-17bfe74082a4 /usr    ext4   
defaults,noatime,discard          0 0<br>
#UUID=53831f3e-6266-4186-a7e1-90ecd027b981 /home   ext4   
defaults,noatime,discard          0 1<br>
#UUID=cbdfcbb5-dff1-4b21-8eca-d1684b621fb2 /opt    ext4   
defaults,noatime,discard          0 1<br>
#UUID=d43c8c7a-1a83-42f7-958d-9402e7bcc48f /var    ext4   
defaults,noatime,discard          0 1<br>
#UUID=95ea1fcc-df9d-4c0b-bce4-a979f8430728 /vm     ext4   
noauto,noatime,discard,user       0 1<br>
<br>
/dev/cdrom      /mnt/cdrom      auto   
rw,exec,noauto,user               0 0<br>
<br>
<br>
# *****************************************************************************<br>
# Booting to the livecd and before chroot, all looks good.<br>
# *****************************************************************************<br>
livecd ~ # lsblk <br>
NAME         MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS<br>
loop0          7:0    0 385.7M  1 loop /mnt/livecd<br>
sda            8:0    1     2G  0 disk <br>
└─sda1         8:1    1     2G  0 part /mnt/cdrom<br>
nvme0n1      259:0    0 931.5G  0 disk <br>
├─nvme0n1p1  259:1    0   100M  0 part <br>
├─nvme0n1p2  259:2    0    16M  0 part <br>
├─nvme0n1p3  259:3    0  52.2G  0 part <br>
├─nvme0n1p4  259:4    0  40.2G  0 part <br>
├─nvme0n1p5  259:5    0 608.6M  0 part <br>
├─nvme0n1p6  259:6    0   2.8G  0 part /mnt/gentoo/boot<br>
├─nvme0n1p7  259:7    0   4.7G  0 part [SWAP]<br>
├─nvme0n1p8  259:8    0   9.3G  0 part /mnt/gentoo<br>
├─nvme0n1p9  259:9    0   3.7G  0 part /mnt/gentoo/lib/modules<br>
├─nvme0n1p10 259:10   0   2.8G  0 part /mnt/gentoo/tmp<br>
├─nvme0n1p11 259:11   0 186.3G  0 part <br>
│ ├─vg0-usr  253:1    0    25G  0 lvm  /mnt/gentoo/usr<br>
│ ├─vg0-var  253:2    0    20G  0 lvm  /mnt/gentoo/var<br>
│ ├─vg0-home 253:3    0    80G  0 lvm  /mnt/gentoo/home<br>
│ └─vg0-opt  253:4    0    20G  0 lvm  /mnt/gentoo/opt<br>
├─nvme0n1p12 259:12   0 186.3G  0 part <br>
│ └─vg1-vm   253:0    0   150G  0 lvm  /mnt/gentoo/vm<br>
├─nvme0n1p13 259:13   0  93.1G  0 part <br>
├─nvme0n1p14 259:14   0  93.1G  0 part <br>
├─nvme0n1p15 259:15   0  46.6G  0 part <br>
├─nvme0n1p16 259:16   0  46.6G  0 part <br>
├─nvme0n1p17 259:17   0  46.6G  0 part <br>
├─nvme0n1p18 259:18   0  46.6G  0 part <br>
├─nvme0n1p19 259:19   0  46.6G  0 part <br>
└─nvme0n1p20 259:20   0  23.5G  0 part<br>
<br>
livecd ~ # df -h<br>
Filesystem            Size  Used Avail Use% Mounted on<br>
none                   32G  704K   32G   1% /run<br>
udev                   10M     0   10M   0% /dev<br>
shm                    32G     0   32G   0% /dev/shm<br>
tmpfs                  32G   60M   32G   1% /<br>
/dev/sda1             2.0G  436M  1.6G  22% /mnt/cdrom<br>
/dev/loop0            386M  386M     0 100% /mnt/livecd<br>
cgroup_root            10M     0   10M   0% /sys/fs/cgroup<br>
/dev/nvme0n1p8        9.1G  915M  7.7G  11% /mnt/gentoo<br>
/dev/nvme0n1p6        2.8G  105M  2.6G   4% /mnt/gentoo/boot<br>
/dev/nvme0n1p9        3.6G  112M  3.3G   4% /mnt/gentoo/lib/modules<br>
/dev/nvme0n1p10       2.7G   32K  2.6G   1% /mnt/gentoo/tmp<br>
/dev/mapper/vg0-usr    25G  3.7G   20G  16% /mnt/gentoo/usr<br>
/dev/mapper/vg0-var    20G  2.4G   17G  13% /mnt/gentoo/var<br>
/dev/mapper/vg0-home   79G   24K   75G   1% /mnt/gentoo/home<br>
/dev/mapper/vg0-opt    20G   14M   19G   1% /mnt/gentoo/opt<br>
/dev/mapper/vg1-vm    147G   28K  140G   1% /mnt/gentoo/vm<br>
tmpfs                  32G     0   32G   0% /mnt/gentoo/dev/shm<br>
<br>
<br>
# *****************************************************************************<br>
# Booting to the livecd and after chroot, all looks good.<br>
# *****************************************************************************<br>
(chroot) livecd # lsblk<br>
NAME         MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS<br>
loop0          7:0    0 385.7M  1 loop <br>
sda            8:0    1     2G  0 disk <br>
└─sda1         8:1    1     2G  0 part <br>
nvme0n1      259:0    0 931.5G  0 disk <br>
├─nvme0n1p1  259:1    0   100M  0 part <br>
├─nvme0n1p2  259:2    0    16M  0 part <br>
├─nvme0n1p3  259:3    0  52.2G  0 part <br>
├─nvme0n1p4  259:4    0  40.2G  0 part <br>
├─nvme0n1p5  259:5    0 608.6M  0 part <br>
├─nvme0n1p6  259:6    0   2.8G  0 part /boot<br>
├─nvme0n1p7  259:7    0   4.7G  0 part [SWAP]<br>
├─nvme0n1p8  259:8    0   9.3G  0 part /<br>
├─nvme0n1p9  259:9    0   3.7G  0 part /lib/modules<br>
├─nvme0n1p10 259:10   0   2.8G  0 part /tmp<br>
├─nvme0n1p11 259:11   0 186.3G  0 part <br>
│ ├─vg0-usr  253:1    0    25G  0 lvm  /usr<br>
│ ├─vg0-var  253:2    0    20G  0 lvm  /var<br>
│ ├─vg0-home 253:3    0    80G  0 lvm  /home<br>
│ └─vg0-opt  253:4    0    20G  0 lvm  /opt<br>
├─nvme0n1p12 259:12   0 186.3G  0 part <br>
│ └─vg1-vm   253:0    0   150G  0 lvm  /vm<br>
├─nvme0n1p13 259:13   0  93.1G  0 part <br>
├─nvme0n1p14 259:14   0  93.1G  0 part <br>
├─nvme0n1p15 259:15   0  46.6G  0 part <br>
├─nvme0n1p16 259:16   0  46.6G  0 part <br>
├─nvme0n1p17 259:17   0  46.6G  0 part <br>
├─nvme0n1p18 259:18   0  46.6G  0 part <br>
├─nvme0n1p19 259:19   0  46.6G  0 part <br>
└─nvme0n1p20 259:20   0  23.5G  0 part<br>
<br>
(chroot) livecd # df -h<br>
Filesystem            Size  Used Avail Use% Mounted on<br>
/dev/nvme0n1p8        9.1G  915M  7.7G  11% /<br>
/dev/nvme0n1p6        2.8G  105M  2.6G   4% /boot<br>
/dev/nvme0n1p9        3.6G  112M  3.3G   4% /lib/modules<br>
/dev/nvme0n1p10       2.7G   32K  2.6G   1% /tmp<br>
/dev/mapper/vg0-usr    25G  3.7G   20G  16% /usr<br>
/dev/mapper/vg0-var    20G  2.4G   17G  13% /var<br>
/dev/mapper/vg0-home   79G   24K   75G   1% /home<br>
/dev/mapper/vg0-opt    20G   14M   19G   1% /opt<br>
/dev/mapper/vg1-vm    147G   28K  140G   1% /vm<br>
cgroup_root            10M     0   10M   0% /sys/fs/cgroup<br>
udev                   10M     0   10M   0% /dev<br>
tmpfs                  32G     0   32G   0% /dev/shm<br>
none                   32G  704K   32G   1% /run<br>
<br>
<br>
<br>
# *****************************************************************************<br>
# Booting to new system, the df -h does not shows /usr in<br>
# the vg0 volume group under /dev/mapper.<br>
# *****************************************************************************<br>
newhost / # df -h<br>
Filesystem            Size  Used Avail Use% Mounted on<br>
none                   32G  604K   32G   1% /run<br>
udev                   10M     0   10M   0% /dev<br>
tmpfs                  32G     0   32G   0% /dev/shm<br>
/dev/nvme0n1p8        9.1G  916M  7.7G  11% /<br>
<b>/dev/dm-1              25G  3.9G   20G  17% /usr </b><b>  # This
looks wrong,</b><b> the expectation is that it would be
/dev/mapper/vg0-usr .</b><b><br>
</b>cgroup_root            10M     0   10M   0% /sys/fs/cgroup<br>
/dev/nvme0n1p6        2.8G  105M  2.6G   4% /boot<br>
/dev/nvme0n1p9        3.6G  112M  3.3G   4% /lib/modules<br>
/dev/nvme0n1p10       2.7G   32K  2.6G   1% /tmp<br>
/dev/mapper/vg0-home   79G   24K   75G   1% /home<br>
/dev/mapper/vg0-opt    20G  7.3M   19G   1% /opt<br>
/dev/mapper/vg0-var    20G  2.8G   16G  15% /var<br>
<br>
newhost / # lsblk <br>
NAME         MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS<br>
nvme0n1      259:0    0 931.5G  0 disk <br>
├─nvme0n1p1  259:1    0   100M  0 part <br>
├─nvme0n1p2  259:2    0    16M  0 part <br>
├─nvme0n1p3  259:3    0  52.2G  0 part <br>
├─nvme0n1p4  259:4    0  40.2G  0 part <br>
├─nvme0n1p5  259:5    0 608.6M  0 part <br>
├─nvme0n1p6  259:6    0   2.8G  0 part /boot<br>
├─nvme0n1p7  259:7    0   4.7G  0 part [SWAP]<br>
├─nvme0n1p8  259:8    0   9.3G  0 part /<br>
├─nvme0n1p9  259:9    0   3.7G  0 part /lib/modules<br>
├─nvme0n1p10 259:10   0   2.8G  0 part /tmp<br>
├─nvme0n1p11 259:11   0 186.3G  0 part <br>
│ ├─<b>vg0-usr  253:1    0    25G  0 lvm  /usr </b><b>  # This
looks right.</b><br>
│ ├─vg0-var  253:2    0    20G  0 lvm  /var<br>
│ ├─vg0-home 253:3    0    80G  0 lvm  /home<br>
│ └─vg0-opt  253:4    0    20G  0 lvm  /opt<br>
├─nvme0n1p12 259:12   0 186.3G  0 part <br>
│ └─vg1-vm   253:0    0   150G  0 lvm  <br>
├─nvme0n1p13 259:13   0  93.1G  0 part <br>
├─nvme0n1p14 259:14   0  93.1G  0 part <br>
├─nvme0n1p15 259:15   0  46.6G  0 part <br>
├─nvme0n1p16 259:16   0  46.6G  0 part <br>
├─nvme0n1p17 259:17   0  46.6G  0 part <br>
├─nvme0n1p18 259:18   0  46.6G  0 part <br>
├─nvme0n1p19 259:19   0  46.6G  0 part <br>
└─nvme0n1p20 259:20   0  23.5G  0 part <br>
<br>
newhost / # ls -l /dev/vg0 /dev/vg1<br>
/dev/vg0:<br>
total 0<br>
lrwxrwxrwx 1 root root 7 Apr  4 03:32 home -&gt; ../dm-3<br>
lrwxrwxrwx 1 root root 7 Apr  4 03:32 opt -&gt; ../dm-4<br>
lrwxrwxrwx 1 root root 7 Apr  4 03:32 <b>usr -&gt; ../dm-1  # This
looks right.</b><br>
lrwxrwxrwx 1 root root 7 Apr  4 03:32 var -&gt; ../dm-2<br>
<br>
/dev/vg1:<br>
total 0<br>
lrwxrwxrwx 1 root root 7 Apr  4 03:32 vm -&gt; ../dm-0<br>
<br>
# mount /usr<br>
mount: /usr: /dev/mapper/vg0-usr already mounted or mount point
busy.<br>
<br>
</body>
</html>

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

dhk wrote:

My new laptop is set up to dual boot and has a clean Gentoo install as
the second operating system.  It looks like there may be an issue with
the /usr Logical Volume (LV) somewhere between LVM, initramfs and
udev.  Only the base system has been installed and updated (no desktop).

The issue is the /usr logical volume is not mounted as expected. 
After booting without the livecd:
  * The df -h command show /usr on /dev/dm-1 and not
/dev/mapper/vg0-usr like the in the fstab.
  * My expectation is it should follow the other LVs (home, var, opt,
vm) and be in the vg0 Volume Group on /dev/mapper .
  * However the mount /usr command indicates that it is mounted
correctly:  mount: /usr: /dev/mapper/vg0-usr already mounted or mount
point busy.

Is there something off here or is this correct behavior?

The laptop is a new HP Envy x360, 2-in-1 Flip Laptop, 15.6" Full HD Touchscreen, AMD Ryzen 7 5700U Processor, 64GB RAM and 1TB PCIe SSD.

Below is the /etc/fstab and output from lsblk, df -h and the links in
the volume group after booting to the livecd and booting to the ssd.

Thank you

# ***************************************************************************** # /etc/fstab:  This is a dual boot system (Windows 11 & Gentoo), the
# same results occurred using straight mount points, LABEL and UUID.
# ***************************************************************************** # <fs>          <mountpoint>    <type>  <opts>                     
<dump/pass>
#/dev/nvme0n1p1 /efi            vfat    noauto,noatime                    1 2
#/dev/nvme0n1p2 /
#/dev/nvme0n1p3 /Win11
#/dev/nvme0n1p4 /Win11Data
#/dev/nvme0n1p5 /Win11Recovery
/dev/nvme0n1p6  /boot           ext2    defaults,noatime                  0 2
/dev/nvme0n1p7  none            swap    sw                                0 0 /dev/nvme0n1p8  /               ext4    defaults,noatime,discard          0 1
/dev/nvme0n1p9  /lib/modules    ext4    defaults,noatime,discard          0 1
/dev/nvme0n1p10 /tmp            ext4    defaults,noatime,discard          0 2

#/dev/mapper/vg0-usr     /usr    ext4    defaults,noatime,discard          0 0
#/dev/mapper/vg0-home    /home   ext4    defaults,noatime,discard          0 1
#/dev/mapper/vg0-opt     /opt    ext4    defaults,noatime,discard          0 1
#/dev/mapper/vg0-var     /var    ext4    defaults,noatime,discard          0 1
#/dev/mapper/vg1-vm      /vm     ext4    noauto,noatime,discard,user       0 1

#Use blkid /dev/mapper/* to get the LABEL and UUID (quotes cause errors). LABEL=usr   /usr    ext4    defaults,noatime,discard          0 0
LABEL=home  /home   ext4    defaults,noatime,discard          0 1
LABEL=opt   /opt    ext4    defaults,noatime,discard          0 1
LABEL=var   /var    ext4    defaults,noatime,discard          0 1
LABEL=vm    /vm     ext4    noauto,noatime,discard,user       0 1

#UUID=d9237094-6589-4e90-989d-17bfe74082a4 /usr    ext4    defaults,noatime,discard          0 0 #UUID=53831f3e-6266-4186-a7e1-90ecd027b981 /home   ext4    defaults,noatime,discard          0 1 #UUID=cbdfcbb5-dff1-4b21-8eca-d1684b621fb2 /opt    ext4    defaults,noatime,discard          0 1 #UUID=d43c8c7a-1a83-42f7-958d-9402e7bcc48f /var    ext4    defaults,noatime,discard          0 1 #UUID=95ea1fcc-df9d-4c0b-bce4-a979f8430728 /vm     ext4    noauto,noatime,discard,user       0 1

/dev/cdrom      /mnt/cdrom      auto    rw,exec,noauto,user               0 0

# ***************************************************************************** # Booting to the livecd and before chroot, all looks good.
# ***************************************************************************** livecd ~ # lsblk
NAME         MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS loop0          7:0    0 385.7M  1 loop /mnt/livecd sda            8:0    1     2G  0 disk └─sda1         8:1    1     2G  0 part /mnt/cdrom nvme0n1      259:0    0 931.5G  0 disk
├─nvme0n1p1  259:1    0   100M  0 part
├─nvme0n1p2  259:2    0    16M  0 part
├─nvme0n1p3  259:3    0  52.2G  0 part
├─nvme0n1p4  259:4    0  40.2G  0 part
├─nvme0n1p5  259:5    0 608.6M  0 part
├─nvme0n1p6  259:6    0   2.8G  0 part /mnt/gentoo/boot ├─nvme0n1p7  259:7    0   4.7G  0 part [SWAP]
├─nvme0n1p8  259:8    0   9.3G  0 part /mnt/gentoo ├─nvme0n1p9  259:9    0   3.7G  0 part /mnt/gentoo/lib/modules ├─nvme0n1p10 259:10   0   2.8G  0 part /mnt/gentoo/tmp ├─nvme0n1p11 259:11   0 186.3G  0 part
│ ├─vg0-usr  253:1    0    25G  0 lvm  /mnt/gentoo/usr
│ ├─vg0-var  253:2    0    20G  0 lvm  /mnt/gentoo/var
│ ├─vg0-home 253:3    0    80G  0 lvm  /mnt/gentoo/home
│ └─vg0-opt  253:4    0    20G  0 lvm  /mnt/gentoo/opt ├─nvme0n1p12 259:12   0 186.3G  0 part
│ └─vg1-vm   253:0    0   150G  0 lvm  /mnt/gentoo/vm ├─nvme0n1p13 259:13   0  93.1G  0 part
├─nvme0n1p14 259:14   0  93.1G  0 part
├─nvme0n1p15 259:15   0  46.6G  0 part
├─nvme0n1p16 259:16   0  46.6G  0 part
├─nvme0n1p17 259:17   0  46.6G  0 part
├─nvme0n1p18 259:18   0  46.6G  0 part
├─nvme0n1p19 259:19   0  46.6G  0 part
└─nvme0n1p20 259:20   0  23.5G  0 part

livecd ~ # df -h
Filesystem            Size  Used Avail Use% Mounted on none                   32G  704K   32G   1% /run udev                   10M     0   10M   0% /dev shm                    32G     0   32G   0% /dev/shm
tmpfs                  32G   60M   32G   1% / /dev/sda1             2.0G  436M  1.6G  22% /mnt/cdrom /dev/loop0            386M  386M     0 100% /mnt/livecd cgroup_root            10M     0   10M   0% /sys/fs/cgroup /dev/nvme0n1p8        9.1G  915M  7.7G  11% /mnt/gentoo /dev/nvme0n1p6        2.8G  105M  2.6G   4% /mnt/gentoo/boot /dev/nvme0n1p9        3.6G  112M  3.3G   4% /mnt/gentoo/lib/modules
/dev/nvme0n1p10       2.7G   32K  2.6G   1% /mnt/gentoo/tmp /dev/mapper/vg0-usr    25G  3.7G   20G  16% /mnt/gentoo/usr /dev/mapper/vg0-var    20G  2.4G   17G  13% /mnt/gentoo/var /dev/mapper/vg0-home   79G   24K   75G   1% /mnt/gentoo/home /dev/mapper/vg0-opt    20G   14M   19G   1% /mnt/gentoo/opt /dev/mapper/vg1-vm    147G   28K  140G   1% /mnt/gentoo/vm tmpfs                  32G     0   32G   0% /mnt/gentoo/dev/shm

# ***************************************************************************** # Booting to the livecd and after chroot, all looks good.
# ***************************************************************************** (chroot) livecd # lsblk
NAME         MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS loop0          7:0    0 385.7M  1 loop
sda            8:0    1     2G  0 disk └─sda1         8:1    1     2G  0 part
nvme0n1      259:0    0 931.5G  0 disk
├─nvme0n1p1  259:1    0   100M  0 part
├─nvme0n1p2  259:2    0    16M  0 part
├─nvme0n1p3  259:3    0  52.2G  0 part
├─nvme0n1p4  259:4    0  40.2G  0 part
├─nvme0n1p5  259:5    0 608.6M  0 part
├─nvme0n1p6  259:6    0   2.8G  0 part /boot
├─nvme0n1p7  259:7    0   4.7G  0 part [SWAP]
├─nvme0n1p8  259:8    0   9.3G  0 part /
├─nvme0n1p9  259:9    0   3.7G  0 part /lib/modules ├─nvme0n1p10 259:10   0   2.8G  0 part /tmp
├─nvme0n1p11 259:11   0 186.3G  0 part
│ ├─vg0-usr  253:1    0    25G  0 lvm  /usr
│ ├─vg0-var  253:2    0    20G  0 lvm  /var
│ ├─vg0-home 253:3    0    80G  0 lvm  /home
│ └─vg0-opt  253:4    0    20G  0 lvm  /opt
├─nvme0n1p12 259:12   0 186.3G  0 part
│ └─vg1-vm   253:0    0   150G  0 lvm  /vm
├─nvme0n1p13 259:13   0  93.1G  0 part
├─nvme0n1p14 259:14   0  93.1G  0 part
├─nvme0n1p15 259:15   0  46.6G  0 part
├─nvme0n1p16 259:16   0  46.6G  0 part
├─nvme0n1p17 259:17   0  46.6G  0 part
├─nvme0n1p18 259:18   0  46.6G  0 part
├─nvme0n1p19 259:19   0  46.6G  0 part
└─nvme0n1p20 259:20   0  23.5G  0 part

(chroot) livecd # df -h
Filesystem            Size  Used Avail Use% Mounted on /dev/nvme0n1p8        9.1G  915M  7.7G  11% / /dev/nvme0n1p6        2.8G  105M  2.6G   4% /boot /dev/nvme0n1p9        3.6G  112M  3.3G   4% /lib/modules /dev/nvme0n1p10       2.7G   32K  2.6G   1% /tmp /dev/mapper/vg0-usr    25G  3.7G   20G  16% /usr /dev/mapper/vg0-var    20G  2.4G   17G  13% /var /dev/mapper/vg0-home   79G   24K   75G   1% /home /dev/mapper/vg0-opt    20G   14M   19G   1% /opt /dev/mapper/vg1-vm    147G   28K  140G   1% /vm cgroup_root            10M     0   10M   0% /sys/fs/cgroup udev                   10M     0   10M   0% /dev tmpfs                  32G     0   32G   0% /dev/shm none                   32G  704K   32G   1% /run

# ***************************************************************************** # Booting to new system, the df -h does not shows /usr in
# the vg0 volume group under /dev/mapper.
# ***************************************************************************** newhost / # df -h
Filesystem            Size  Used Avail Use% Mounted on none                   32G  604K   32G   1% /run udev                   10M     0   10M   0% /dev tmpfs                  32G     0   32G   0% /dev/shm /dev/nvme0n1p8        9.1G  916M  7.7G  11% / */dev/dm-1              25G  3.9G   20G  17% /usr **  # This looks
wrong,**the expectation is that it would be /dev/mapper/vg0-usr .** *cgroup_root            10M     0   10M   0% /sys/fs/cgroup
/dev/nvme0n1p6        2.8G  105M  2.6G   4% /boot /dev/nvme0n1p9        3.6G  112M  3.3G   4% /lib/modules /dev/nvme0n1p10       2.7G   32K  2.6G   1% /tmp /dev/mapper/vg0-home   79G   24K   75G   1% /home /dev/mapper/vg0-opt    20G  7.3M   19G   1% /opt /dev/mapper/vg0-var    20G  2.8G   16G  15% /var

newhost / # lsblk
NAME         MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS nvme0n1      259:0    0 931.5G  0 disk
├─nvme0n1p1  259:1    0   100M  0 part
├─nvme0n1p2  259:2    0    16M  0 part
├─nvme0n1p3  259:3    0  52.2G  0 part
├─nvme0n1p4  259:4    0  40.2G  0 part
├─nvme0n1p5  259:5    0 608.6M  0 part
├─nvme0n1p6  259:6    0   2.8G  0 part /boot
├─nvme0n1p7  259:7    0   4.7G  0 part [SWAP]
├─nvme0n1p8  259:8    0   9.3G  0 part /
├─nvme0n1p9  259:9    0   3.7G  0 part /lib/modules ├─nvme0n1p10 259:10   0   2.8G  0 part /tmp
├─nvme0n1p11 259:11   0 186.3G  0 part
│ ├─*vg0-usr  253:1    0    25G  0 lvm  /usr **  # This looks right.*
│ ├─vg0-var  253:2    0    20G  0 lvm  /var
│ ├─vg0-home 253:3    0    80G  0 lvm  /home
│ └─vg0-opt  253:4    0    20G  0 lvm  /opt
├─nvme0n1p12 259:12   0 186.3G  0 part
│ └─vg1-vm   253:0    0   150G  0 lvm  
├─nvme0n1p13 259:13   0  93.1G  0 part
├─nvme0n1p14 259:14   0  93.1G  0 part
├─nvme0n1p15 259:15   0  46.6G  0 part
├─nvme0n1p16 259:16   0  46.6G  0 part
├─nvme0n1p17 259:17   0  46.6G  0 part
├─nvme0n1p18 259:18   0  46.6G  0 part
├─nvme0n1p19 259:19   0  46.6G  0 part
└─nvme0n1p20 259:20   0  23.5G  0 part

newhost / # ls -l /dev/vg0 /dev/vg1
/dev/vg0:
total 0
lrwxrwxrwx 1 root root 7 Apr  4 03:32 home -> ../dm-3
lrwxrwxrwx 1 root root 7 Apr  4 03:32 opt -> ../dm-4
lrwxrwxrwx 1 root root 7 Apr  4 03:32 *usr -> ../dm-1  # This looks
right.*
lrwxrwxrwx 1 root root 7 Apr  4 03:32 var -> ../dm-2

/dev/vg1:
total 0
lrwxrwxrwx 1 root root 7 Apr  4 03:32 vm -> ../dm-0

# mount /usr
mount: /usr: /dev/mapper/vg0-usr already mounted or mount point busy.

Is it possible that something else has the usr label?  I don't see
anything in the info you provided but maybe it is elsewhere, somewhere. 

Another option, try using the UUID instead.  That would eliminate the
above if that is the problem. 

Grasping at straws. 

Dale

:-)  :-) 

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 06/04/2022 14:12, Dale wrote:

Is it possible that something else has the usr label?  I don't see
anything in the info you provided but maybe it is elsewhere, somewhere.

Another option, try using the UUID instead.  That would eliminate the
above if that is the problem.

Grasping at straws.

Or is /usr mounted by the initramfs, and just as you switch-mount root,
you might have to switch-mount /usr?

Cheers,
Wol

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

So it sounds like /usr being under /dev/dm-1 instead of /dev/mapper does
not look right.

The UUID was tried in the fstab and the same results occurred, same as
with LABEL and mount points.

Since /usr is mounted temporarily at boot it almost looks as if there is something wrong with the way the initramfs is handling it. The tmpfs is
built into the kernel and the /etc/initramfs.mounts looks correct with
only /usr in it, but /lib/modules was tried also and did not make a
difference.

Could this be a bug with genkernel or udev?

Thanks

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Wed, 06 Apr 2022 19:38:16 -0400,
dhk wrote:

So it sounds like /usr being under /dev/dm-1 instead of
/dev/mapper does not look right.

The UUID was tried in the fstab and the same results occurred,
same as with LABEL and mount points.

Since /usr is mounted temporarily at boot it almost looks as if
there is something wrong with the way the initramfs is handling
it. The tmpfs is built into the kernel and the
/etc/initramfs.mounts looks correct with only /usr in it, but
/lib/modules was tried also and did not make a difference.

Could this be a bug with genkernel or udev?

Are you using systemd or openrc? What are you using for your initrd,
dracut or something else? I also wonder if dm1 is the same thing as
your /dev/mapper/... by another name -- check where the link points
to.

--
Your life is like a penny. You're going to lose it. The question is:
How do
you spend it?

John Covici wb2una
covici@ccs.covici.com

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 07/04/2022 05:00, John Covici wrote:

Are you using systemd or openrc? What are you using for your initrd,
dracut or something else? I also wonder if dm1 is the same thing as your/dev/mapper/... by another name -- check where the link points
to.

If it isn't, then there's something wrong. You should be using
/dev/mapper/..., which should be a link to whatever device is underlying
it. /dev/dm-1 will be whatever devicemapper brought up as the first
device it found.

Cheers,
Wol

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Tue, 5 Apr 2022 20:25:09 -0400, dhk wrote:

The issue is the /usr logical volume is not mounted as expected. After booting without the livecd:
  * The df -h command show /usr on /dev/dm-1 and not
/dev/mapper/vg0-usr like the in the fstab.
  * My expectation is it should follow the other LVs (home, var, opt,
vm) and be in the vg0 Volume Group on /dev/mapper .
  * However the mount /usr command indicates that it is mounted correctly:  mount: /usr: /dev/mapper/vg0-usr already mounted or mount
point busy.

Is there something off here or is this correct behavior?

newhost / # ls -l /dev/vg0 /dev/vg1
/dev/vg0:
total 0
lrwxrwxrwx 1 root root 7 Apr  4 03:32 home -> ../dm-3
lrwxrwxrwx 1 root root 7 Apr  4 03:32 opt -> ../dm-4
lrwxrwxrwx 1 root root 7 Apr  4 03:32 *usr -> ../dm-1  # This looks
right.* lrwxrwxrwx 1 root root 7 Apr  4 03:32 var -> ../dm-2

/dev/mapper/vg0-usr and /dev/dm-1 are the same device, so nothing is
actually wrong, this is more a cosmetic issue. You are mounting the
correct device, it is just showing as a different name.

I suspect the initramfs here, what does the fstab inside that look like?

How are you creating the initramfs? Genkernel, dracut, home brewed?


--
Neil Bothwick

The word 'Windows' is a word out of an old dialect of the Apaches.
It means: 'White man staring through glass-screen onto an hourglass...')

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This is a multi-part message in MIME format.
Having /dev/dm-1 mounted on /usr would not be an issue if it was
supposed to be that way; however, nothing in the handbook or anything
else I have read says that is correct.  In addition, every other system
I have setup or used always had /usr as the mount point in the fstab.

My primary questions are:
  * Why is it different this time?
  * What changed to make /usr mount the block device?
  * Why is the /usr record in the fstab being ignored and being handled differently that /var, /opt, /home and /vm ?

Even though everything seems to be work correctly, without a good and authoritative explanation my confidence level in the stability is not
too high and is preventing me from relying on it as primary host.

My concerns about not having a good explanation for why df -h shows
/dev/dm-1 on /usr instead of /dev/mapper/vg0-usr are:
* There could be problems interfacing directly with the block device (/dev/dm-1) and not the link (/dev/mapper/vg0-usr).
* When it comes time to extend the /usr logical volume and use commands
like lvextend, resize2fs, lvresize and some others it may cause problems.
* The documentation does not say this is correct, in fact the
documentation specifically says the opposite that the fstab is used for
the mount points.
* It looks like the initramfs is not letting go of the temporary /usr
mount and mounting /usr in the vg0-usr volume group correctly.

After reinstalling Gentoo with a new liveusb, my system still looks
similar to the way it was before.  I started with the existing partition schema and wiped everything and performed a separate independent
install.  I am still not sure why the /dev/dm-1 block device is mounted
on /usr which is not what the fstab is instructing.

UUIDs are not being used because the handbook says:
*Important:*  UUIDs of the filesystem on a LVM volume and its LVM
snapshots are identical, therefore using UUIDs to mount LVM volumes
should be avoided.

/etc/fstab:
/dev/nvme0n1p6          /boot           ext2 defaults,noatime                    0 2 /dev/nvme0n1p7          none            swap sw                                  0 0 /dev/nvme0n1p8          /               ext4 defaults,noatime,discard            0 1 /dev/nvme0n1p9          /lib/modules    ext4 defaults,noatime,discard            0 1 /dev/nvme0n1p10         /tmp            ext4 defaults,noatime,discard            0 1
/dev/mapper/vg0-usr     /usr            ext4 defaults,noatime,discard            0 0
/dev/mapper/vg0-home    /home           ext4 defaults,noatime,discard            0 1
/dev/mapper/vg0-opt     /opt            ext4 defaults,noatime,discard            0 1
/dev/mapper/vg0-var     /var            ext4 defaults,noatime,discard            0 1
/dev/mapper/vg1-vm      /vm             ext4 noauto,noatime,discard              0 1
/dev/cdrom      /mnt/cdrom      auto rw,exec,noauto,user             0 0

/etc/initramfs.mounts has:
/usr

# ls -l /dev/mapper/vg0-usr
lrwxrwxrwx 1 root root 7 Apr 23 05:56 /dev/mapper/vg0-usr -> ../dm-1

# mount /usr
mount: /usr: /dev/mapper/vg0-usr already mounted or mount point busy.

# df -h /usr
Filesystem      Size  Used Avail Use% Mounted on
/dev/dm-1        25G  3.2G   20G  14% /usr

Thank you
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
Having /dev/dm-1 mounted on /usr would not be an issue if it was
supposed to be that way; however, nothing in the handbook or
anything else I have read says that is correct.  In addition, every
other system I have setup or used always had /usr as the mount point
in the fstab.<br>
<br>
My primary questions are:<br>
  * Why is it different this time?<br>
  * What changed to make /usr mount the block device?<br>
  * Why is the /usr record in the fstab being ignored and being
handled differently that /var, /opt, /home and /vm ?<br>
<br>
Even though everything seems to be work correctly, without a good
and authoritative explanation my confidence level in the stability
is not too high and is preventing me from relying on it as primary
host.<br>
<br>
My concerns about not having a good explanation for why df -h shows
/dev/dm-1 on /usr instead of /dev/mapper/vg0-usr are:<br>
* There could be problems interfacing directly with the block device
(/dev/dm-1) and not the link (/dev/mapper/vg0-usr).<br>
* When it comes time to extend the /usr logical volume and use
commands like lvextend, resize2fs, lvresize and some others it may
cause problems.<br>
* The documentation does not say this is correct, in fact the
documentation specifically says the opposite that the fstab is used
for the mount points.<br>
* It looks like the initramfs is not letting go of the temporary
/usr mount and mounting /usr in the vg0-usr volume group correctly.<br>
<br>
After reinstalling Gentoo with a new liveusb, my system still looks
similar to the way it was before.  I started with the existing
partition schema and wiped everything and performed a separate
independent install.  I am still not sure why the /dev/dm-1 block
device is mounted on /usr which is not what the fstab is
instructing.<br>
<br>
UUIDs are not being used because the handbook says:<br>
<strong> Important:</strong>  UUIDs of the filesystem on a LVM
volume and its LVM snapshots are identical, therefore using UUIDs to
mount LVM volumes should be avoided.<br>
<br>
/etc/fstab:<br>
/dev/nvme0n1p6          /boot           ext2   
defaults,noatime                    0 2<br>
/dev/nvme0n1p7          none            swap   
sw                                  0 0<br>
/dev/nvme0n1p8          /               ext4   
defaults,noatime,discard            0 1<br>
/dev/nvme0n1p9          /lib/modules    ext4   
defaults,noatime,discard            0 1<br>
/dev/nvme0n1p10         /tmp            ext4   
defaults,noatime,discard            0 1<br>
/dev/mapper/vg0-usr     /usr            ext4   
defaults,noatime,discard            0 0<br>
/dev/mapper/vg0-home    /home           ext4   
defaults,noatime,discard            0 1<br>
/dev/mapper/vg0-opt     /opt            ext4   
defaults,noatime,discard            0 1<br>
/dev/mapper/vg0-var     /var            ext4   
defaults,noatime,discard            0 1<br>
/dev/mapper/vg1-vm      /vm             ext4   
noauto,noatime,discard              0 1<br>
/dev/cdrom      /mnt/cdrom      auto   
rw,exec,noauto,user             0 0<br>
<br>
/etc/initramfs.mounts has:<br>
/usr<br>
<br>
# ls -l /dev/mapper/vg0-usr<br>
lrwxrwxrwx 1 root root 7 Apr 23 05:56 /dev/mapper/vg0-usr -&gt;
../dm-1<br>
<br>
# mount /usr <br>
mount: /usr: /dev/mapper/vg0-usr already mounted or mount point
busy.<br>
<br>
# df -h /usr <br>
Filesystem      Size  Used Avail Use% Mounted on<br>
/dev/dm-1        25G  3.2G   20G  14% /usr<br>
<br>
Thank you<br>
</body>
</html>

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 25/04/2022 14:36, dhk wrote:

After reinstalling Gentoo with a new liveusb, my system still looks
similar to the way it was before.  I started with the existing partition schema and wiped everything and performed a separate independent
install.  I am still not sure why the /dev/dm-1 block device is mounted
on /usr which is not what the fstab is instructing.

First of all, I notice you haven't said anything about /home, /opt etc.
Missing context is important ...

Secondly, vg0-usr is a symlink to dm-1, so I would not be suprised for
df to resolve it.

In fact, looking at both the output of mount, and df, on my system they
are inconsistent. mount tells me /dev/mapper/vg-root-lv-gentoo is
mounted on /, while df tells me /dev/dm-1 is mounted on /.

My guess is that anything to do with initial boot may or may not link to /dev/dm-x, anything after that links to vg as you expect.

Either way it doesn't really make any difference imho.

Cheers,
Wol

--- SoupGate-Win32 v1.05
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