[Lustre-discuss] Getting around a Catch-22

[Cliff White]

On 12/07/2010 06:51 AM, Bob Ball wrote:
> We have 6 OSS, each with at least 8 OST.  It sometimes happens that I
> need to do maintenance on an OST, so to avoid hanging processes on the
> client machines, I use lctl to disable access to that OST on active
> client machines.
>
> So, now, it may happen during this maintenance that a client machine is
> rebooted.  So far so good, until it comes time for the Lustre mount.  At
> this point, the reboot will hang, as the under-maintenance OST that is
> expected to be found by this rebooting client, is not found.
>
> Is there some way around this Catch-22?

This is covered in the Lustre Manual, see the 'exclude' option to mount:
http://wiki.lustre.org/manual/LustreManual18_HTML/ConfiguringLustre.html#50651184_pgfId-1298889

cliffw
>
> Thanks,
> bob
>
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