Re: [Xen-devel] Xen blktap driver for Ceph RBD : Anybody wants to test ? :p

[Sylvain Munaut <s.munaut@xxxxxxxxxxxxxxxxxxxx>]

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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