On Wed, Mar 16, 2022 at 4:45 PM Demeter Tibor <tdeme...@itsmart.hu> wrote:
> Dear Didi,
> Thank you for your reply.
> My glusterfs uses the host's internal disks. I have 4 hosts, but the 
> glusterfs use only 3.  It is a centos7 based system.
> As I think, I have to elminate the glusterfs first, because I can't upgrade 
> the hosts until the engine running on there. That's why I think the engine 
> will access  to them after the reinstall.

Sorry, I do not think I understand your reasoning/plan. Please clarify.

> Is it fine?

If the question is:

"I have a HC hosted-engine+gluster on 3 hosts + another host. I want
to move the hosted-engine (on one of the hosts? not clear) to external
iscsi storage. Will the new engine be able to access the gluster
storage on the existing hosts?"

Then, sadly, I don't know. I *think* it will work - that gluster does
not need the engine to function - but never tried this.

> What pitfalls can I except in this case?

Many, if you ask me - mainly, because it's a flow probably hardly
anyone ever tried, and it definitely goes out of the set of
assumptions built into the basic design. I strongly suggest to test
first on a test env (can be on nested-kvm VMs, no need for physical
hosts) and to have good backups. But in theory, I can't think of any
concrete point.

Best regards,

> Thanks in advance,
> Tibor
> ________________________________
> Feladó: Yedidyah <d...@redhat.com>
> Címzett: Demeter <tdeme...@itsmart.hu>
> Másolat: users <users@ovirt.org>
> Dátum: 2022. március 16., szerda 15:08 CET
> Tantárgy: Re: [ovirt-users] Replace storage behind ovirt engine
> On Wed, Mar 16, 2022 at 1:39 PM Demeter Tibor <tdeme...@itsmart.hu> wrote:
> >
> > Dear Users,
> >
> > I have to upgrade our hyperconverged ovirt system from 4.3 to 4.4, but 
> > meanwhile I would like to change the storage backend under the engine. At 
> > this moment it is a gluster based clustered fs, but I don't really like 
> > it.... I would like to change to a hardver based iscsi storage.
> > I just wondering, when I do the engine reinstall, I will install it to an 
> > other storage.
> > Is it possible somehow?
> The "canonical" way is:
> 1. On current engine machine: engine-backup --file=f1
> 2. (Re)Install a new host (with 4.4?), copy there f1, and:
> hosted-engine --deploy --restore-from-file=f1
> This only handles your engine VM, not others. The new engine (with its
> hosted_storage on the new iscsi storage) will need access to the
> existing gluster storage holding the other VMs, if you plan to somehow
> import/migrate/whatever them. If unsure how to continue, perhaps
> clarify your plan with more details.
> Good luck,
> --
> Didi

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