From:   Lars Ellenberg <[email protected]>

> Ok, corrected to 8.3.11:
> > > Kernel 3.1.0 / DRBD 8.3.11
> 
> Nothing directly DRBD related in the stack traces.

Yes, makes sense for the md_resync, but what for the KVM process? It does 
access its device via DRBD, so is the stacktrace incomplete? (missing DRBD 
layer?).

> But you have one kvm in:
> kernel: [2009644.546925]  [<ffffffffa00939d1>] ?  wait_barrier+0x87/0xc0 
> [raid1]
> and md1_resync in 
> kernel: [2009644.547433]  [<ffffffffa0093917>] ?  raise_barrier+0x11a/0x14d 
> [raid1]
> 
> Looks like MD is stepping on it's own toes there.

Stepping on one's own toes is something one isn't supposed to do, right? ;-)

I might raise the issue with the MD developpers but at the moment I am still 
confused why DRBD did behave like it did. How would DRBD behave when the 
backing device blocks hard?

regards,

Andreas
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