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Re: best guess for mount-verification problem

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Phillip,

Phillip Helbig (undress to reply) schrieb am 28.06.2021 um 12:57:
> 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.

Hope this helps,
Hans.

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best guess for mount-verification problem helbig@asclothestro.multivax.de (Phillip Helbig (undress to reply)) - 2021-06-28 10:27 +0000
  Re: best guess for mount-verification problem helbig@asclothestro.multivax.de (Phillip Helbig (undress to reply)) - 2021-06-28 10:40 +0000
    Re: best guess for mount-verification problem helbig@asclothestro.multivax.de (Phillip Helbig (undress to reply)) - 2021-06-28 10:57 +0000
      Re: best guess for mount-verification problem Hans Bachner <hans@bachner.priv.at> - 2021-06-28 16:04 +0200
        Re: best guess for mount-verification problem helbig@asclothestro.multivax.de (Phillip Helbig (undress to reply)) - 2021-06-28 19:21 +0000

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