On 21 Oct 2011, at 01:33, Florian Haas wrote:
>>> Am I mad? Should it work?
>> It does. We run DRBD + Pcmk + OCFS2 for testing. I would not use such a
>> setup in production though.
>
> Agree.
Thanks for your feedback.
FYI, I set it up to test it out, and it seemed to work. The concerning part
(aside from your advice to not use this architecture in production) was that
during sync, which satisfyingly ran at a little over the 900,000,000 bps mark
(according to tcpstat), the CPU utilisation of the associated kvm process would
shoot up to 150-200% (4-CPU VM) and stay there for the duration of the
synchronisation. I suppose this is a QEMU/virtio/kvm IO mapping thing.
Perhaps SCSI passthrough would help here.
But based on your advice, I'll take another look at OCFS2, build a test
environment inside the VMs, with the aim of installing it on the physical hosts
for production. Will do everything possible to avoid split-brain.
Is there any easy and well defined way to set up a HA shared storage system
with just two hosts, without using DRBD active/active? NFS server+client on
the same machine is problematic, but perhaps there's another method I haven't
thought of.
Cheers!
N
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