Hi,
> I just tested with tap2:aio and that worked (had an old image of the VM on
> lvm still so just tested with that). Switching back to rbd and it crashes
> every time, just as postgres is starting in the vm. Booting into single user
> mode, waiting 30 seconds, then letting the boot continue it still crashes at
> the same point so I think it's not a timing thing - maybe postgres has a disk
> access pattern that is triggering the bug?
Mmm, that's really interesting.
Could you try to disable request merging ? Just give option
max_merge_size=0 in the tap2 disk description. Something like
'tap2:tapdisk:rbd:rbd/test:max_merge_size=0,xvda2,w'
Cheers,
Sylvain
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