has anybody seen this before, got any insight?
James
James Masson wrote:
> Hi list,
>
> I'm using DRBD and NFS to provide HA to Virtual Machine images between pairs
> of storage servers.
>
> Systems are RHEL5.4 2.6.18-164.el5 + drbd8.3 from Centos Extras
>
> We've been having issues where disk I/O problems on the DRBD Secondary stops
> all IO to the Primary
> too. DRBD doesn't seem to recognise these disk I/O problems, the Secondary
> isn't disconnected
> automatically. Everything just hangs.
>
> During this state:
> If I try a "drbdadm disconnect all" on the Primary, the command hangs.
> If I try this on the Secondary, the command eventually completes, and NFS I/O
> returns to normal
> operation on the Primary.
>
> I've tried the following things to fix this:
>
> 1) Putting in a custom local-io-error handler to hard reset the problem node.
>
> This never triggers. Just like the default "detach", never triggers.
>
> 2) Changing the net connection parameters to:
>
> net {
> ko-count 2;
> timeout 20;
> }
>
> Again, this never triggers.
>
>
> 3) Changing the protocol used from C to B
>
> Doesn't have any effect on the issue - I'd prefer to use C anyway.
>
>
> Any further ideas on how to track this issue down and fix it?
>
> thanks
>
> James Masson
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