In article <sbc8uu$hn9$1@gioia.aioe.org>,
helbig@asclothestro.multivax.de (Phillip Helbig (undress to reply))
writes:
In article <sbc86h$656$1@gioia.aioe.org>,
helbig@asclothestro.multivax.de (Phillip Helbig (undress to reply))
writes:
I have a three-node cluster (when no satellite or test system has joined >>> it) and physical disks (blue SBB in BA356) on each node (no dual-ported
disks; each disk has a direct connection to only one node).
When something fails, I just replace it with something of similar build. >>> (The main reason for moving to SBB disks was to be able to replace a
disk (the most common failure) without having to dismount the members it >>> hosts, shut down the system, remove it from the shelf, open it, replace
the disk, close it, put it back on the shelf, boot it, remount the
members it hosts.)
For a while now I've noticed disks going in and out of mount
verification. It is clear which node is involved. So, my plan is to
replace hardware (and maybe try to find the problem when the hardware is >>> out of the cluster) and hope that it goes away.
Theoretically it could be the SCSI cable, but my guess is that it is
either the expansion box or the SCSI card. (I have had one expansion
box fail, but it failed completely.) Which is more likely?
OK, spent some time staring at hardware in the cellar. :-| It seems
that before the mount verification sets in, the two LEDs to the left of
the plug in the power supply go out, then come back on, then all the
disks light up briefly. So probably a problem with the box or the power supply.
I can try replacing the power supply first, if that doesn't help then
the SCSI interface at the top, then if that doesn't help the entire box.
Any other ideas?
If you don't have a disk in slot 6 you could plug in a second power
supply and watch whether the problem (the mount verifications, not the flashing LEDs) disappears.
Anything in VMS's error log? $ DIAG is your friend in this case.
Sysop: | Keyop |
---|---|
Location: | Huddersfield, West Yorkshire, UK |
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