[ovirt-users] Can we debug some truths/myths/facts about hosted-engine and gluster?

[Andrew Lau]

Hi all,

As most of you have got hints from previous messages, hosted engine won't
work on gluster . A quote from BZ1097639

"Using hosted engine with Gluster backed storage is currently something we
really warn against.


I think this bug should be closed or re-targeted at documentation,
because there is nothing we can do here. Hosted engine assumes that
all writes are atomic and (immediately) available for all hosts in the
cluster. Gluster violates those assumptions.

​"

​Until the documentation gets updated, I hope this serves as a useful
notice at least to save people some of the headaches I hit like
hosted-engine starting up multiple VMs because of above issue.
​

Now my question, does this theory prevent a scenario of perhaps something
like a gluster replicated volume being mounted as a glusterfs filesystem
and then re-exported as the native kernel NFS share for the hosted-engine
to consume? It could then be possible to chuck ctdb in there to provide a
last resort failover solution. I have tried myself and suggested it to two
people who are running a similar setup. Now using the native kernel NFS
server for hosted-engine and they haven't reported as many issues. Curious,
could anyone validate my theory on this?

Thanks,
Andrew
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