[ovirt-users] Hosted engine on gluster problem

[Richard Neuboeck]

Hi Darryl,

I'm still experimenting with my oVirt installation so I tried to
recreate the problems you've described.

My setup has three HA hosts for virtualization and three machines
for the gluster replica 3 setup.

I manually migrated the Engine from the initial install host (one)
to host three. Then shut down host one manually and interrupted the
fencing mechanisms so the host stayed down. This didn't bother the
Engine VM at all.

To make things a bit more challenging I then shut down host three
while running the Engine VM. Of course the Engine was down for some
time until host two detected the problem. It started the Engine VM
and everything seems to be running quite well without the initial
install host.

My only problem is that the HA agent on host two and three refuse to
start after a reboot due to the fact that the configuration of the
hosted engine is missing. I wrote another mail to users at ovirt.org
about that.

Cheers
Richard

On 04/08/2016 01:38 AM, Bond, Darryl wrote:
> There seems to be a pretty severe bug with using hosted engine on gluster.
> 
> If the host that was used as the initial hosted-engine --deploy host goes away, the engine VM wil crash and cannot be restarted until the host comes back.
> 
> This is regardless of which host the engine was currently running.
> 
> 
> The issue seems to be buried in the bowels of VDSM and is not an issue with gluster itself.
> 
> The gluster filesystem is still accessable from the host that was running the engine. The issue has been submitted to bugzilla but the fix is some way off (4.1).
> 
> 
> Can my hosted engine be converted to use NFS (using the gluster NFS server on the same filesystem) without rebuilding my hosted engine (ie change domainType=glusterfs to domainType=nfs)?
> 
> What effect would that have on the hosted-engine storage domain inside oVirt, ie would the same filesystem be mounted twice or would it just break.
> 
> 
> Will this actually fix the problem, does it have the same issue when the hosted engine is on NFS?
> 
> 
> Darryl
> 
> 
> 
> 
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