[ovirt-users] Q: Partitioning - oVirt 4.1 & GlusterFS 2-node System

[Andrei V]

Hi, Donny,

Thanks for the link.

Am I understood correctly that I'm need at least 3-node system to run in
failover mode? So far I'm plan to deploy only 2 nodes, either with
hosted either with bare metal engine.

/The key thing to keep in mind regarding host maintenance and downtime
is that this *converged  three node system relies on having at least two
of the nodes up at all times*. If you bring down  two machines at once,
you'll run afoul of the Gluster quorum rules that guard us from
split-brain states in our storage, the volumes served by your remaining
host will go read-only, and the VMs stored on those volumes will pause
and require a shutdown and restart in order to run again./

What happens if in 2-node glusterfs system (with hosted engine) one node
goes down?
Bare metal engine can manage this situation, but I'm not sure about
hosted engine.


On 12/13/2017 11:17 PM, Donny Davis wrote:
> I would start here
> https://ovirt.org/blog/2017/04/up-and-running-with-ovirt-4.1-and-gluster-storage/
>
> Pretty good basic guidance. 
>
> Also with software defined storage its recommended their are at least
> two "storage" nodes and one arbiter node to maintain quorum. 
>
> On Wed, Dec 13, 2017 at 3:45 PM, Andrei V <andreil1 at starlett.lv
> <mailto:andreil1 at starlett.lv>> wrote:
>
>     Hi,
>
>     I'm going to setup relatively simple 2-node system with oVirt 4.1,
>     GlusterFS, and several VMs running.
>     Each node going to be installed on dual Xeon system with single
>     RAID 5.
>
>     oVirt node installer uses relatively simple default partitioning
>     scheme.
>     Should I leave it as is, or there are better options?
>     I never used GlusterFS before, so any expert opinion is very welcome.
>
>     Thanks in advance.
>     Andrei
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