[Pacemaker] Issue with ordering

[Andrew Beekhof]

On Thu, Mar 29, 2012 at 7:07 PM, Vladislav Bogdanov
<bubble at hoster-ok.com> wrote:
> Hi Andrew, all,
>
> I'm continuing experiments with lustre on stacked drbd, and see
> following problem:
>
> I have one drbd resource (ms-drbd-testfs-mdt0000) is stacked on top of
> other (ms-drbd-testfs-mdt0000-left), and have following constraints
> between them:
>
> colocation drbd-testfs-mdt0000-with-drbd-testfs-mdt0000-left inf:
> ms-drbd-testfs-mdt0000 ms-drbd-testfs-mdt0000-left:Master
> order drbd-testfs-mdt0000-after-drbd-testfs-mdt0000-left inf:
> ms-drbd-testfs-mdt0000-left:promote ms-drbd-testfs-mdt0000:start
>
> Then I have filesystem mounted on top of ms-drbd-testfs-mdt0000
> (testfs-mdt0000 resource).
>
> colocation testfs-mdt0000-with-drbd-testfs-mdt0000 inf: testfs-mdt0000
> ms-drbd-testfs-mdt0000:Master
> order testfs-mdt0000-after-drbd-testfs-mdt0000 inf:
> ms-drbd-testfs-mdt0000:promote testfs-mdt0000:start
>
> When I trigger event which causes many resources to stop (including
> these three), LogActions output look like:
>
> LogActions: Stop    drbd-local#011(lustre01-left)
> LogActions: Stop    drbd-stacked#011(Started lustre02-left)
> LogActions: Stop    drbd-testfs-local#011(Started lustre03-left)
> LogActions: Stop    drbd-testfs-stacked#011(Started lustre04-left)
> LogActions: Stop    lustre#011(Started lustre04-left)
> LogActions: Stop    mgs#011(Started lustre01-left)
> LogActions: Stop    testfs#011(Started lustre03-left)
> LogActions: Stop    testfs-mdt0000#011(Started lustre01-left)
> LogActions: Stop    testfs-ost0000#011(Started lustre01-left)
> LogActions: Stop    testfs-ost0001#011(Started lustre02-left)
> LogActions: Stop    testfs-ost0002#011(Started lustre03-left)
> LogActions: Stop    testfs-ost0003#011(Started lustre04-left)
> LogActions: Stop    drbd-mgs:0#011(Master lustre01-left)
> LogActions: Stop    drbd-mgs:1#011(Slave lustre02-left)
> LogActions: Stop    drbd-testfs-mdt0000:0#011(Master lustre01-left)
> LogActions: Stop    drbd-testfs-mdt0000-left:0#011(Master lustre01-left)
> LogActions: Stop    drbd-testfs-mdt0000-left:1#011(Slave lustre02-left)
> LogActions: Stop    drbd-testfs-ost0000:0#011(Master lustre01-left)
> LogActions: Stop    drbd-testfs-ost0000-left:0#011(Master lustre01-left)
> LogActions: Stop    drbd-testfs-ost0000-left:1#011(Slave lustre02-left)
> LogActions: Stop    drbd-testfs-ost0001:0#011(Master lustre02-left)
> LogActions: Stop    drbd-testfs-ost0001-left:0#011(Master lustre02-left)
> LogActions: Stop    drbd-testfs-ost0001-left:1#011(Slave lustre01-left)
> LogActions: Stop    drbd-testfs-ost0002:0#011(Master lustre03-left)
> LogActions: Stop    drbd-testfs-ost0002-left:0#011(Master lustre03-left)
> LogActions: Stop    drbd-testfs-ost0002-left:1#011(Slave lustre04-left)
> LogActions: Stop    drbd-testfs-ost0003:0#011(Master lustre04-left)
> LogActions: Stop    drbd-testfs-ost0003-left:0#011(Master lustre04-left)
> LogActions: Stop    drbd-testfs-ost0003-left:1#011(Slave lustre03-left)
>
> For some reason demote is not run on both mdt drbd esources (should
> it?), so drbd RA prints warning about that.

So its not just a logging error, the demote really isn't scheduled?
That would be bad, can you file a bug please?

>
> What I see then is that ms-drbd-testfs-mdt0000-left is tried to stop
> before ms-drbd-testfs-mdt0000.
>
> More, testfs-mdt0000 filesystem resource is not stopped before stopping
> drbd-testfs-mdt0000.
>
> I have advisory ordering constraints between mdt and ost filesystem
> resources, so all ost's are stopped before mdt. Thus mdt stop is delayed
> a bit. May be this influences what happens.
>
> I'm pretty sure I have correct constraints for at least these three
> resources, so it looks like a bug, because mandatory ordering is not
> preserved.
>
> I can produce report for this.
>
> Best,
> Vladislav
>
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