[ovirt-users] Hosted engine on gluster problem

[Sandro Bonazzola]

On Mon, Apr 11, 2016 at 9:37 AM, Richard Neuboeck <hawk at tbi.univie.ac.at>
wrote:

> 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.
>

Did you move the host one to maintenance before shutting down?
Or is this a crash recovery test?



>
> 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.
>

Thanks for the feedback!



>
> 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.
>

This is weird. Martin,  Simone can you please investigate on this?




>
> 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.
>

is this an Hyperconverged setup?



> >
> > 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.
>

Sahina, can you please investigate on this?



> >
> > 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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-- 
Sandro Bonazzola
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