[Gluster-users] GlusterFS as virtual machine storage
lemonnierk at ulrar.net
lemonnierk at ulrar.net
Wed Aug 23 19:26:45 UTC 2017
Really ? I can't see why. But I've never used arbiter so you probably
know more about this than I do.
In any case, with replica 3, never had a problem.
On Wed, Aug 23, 2017 at 09:13:28PM +0200, Pavel Szalbot wrote:
> Hi, I believe it is not that simple. Even replica 2 + arbiter volume
> with default network.ping-timeout will cause the underlying VM to
> remount filesystem as read-only (device error will occur) unless you
> tune mount options in VM's fstab.
> On Wed, Aug 23, 2017 at 6:59 PM, <lemonnierk at ulrar.net> wrote:
> > What he is saying is that, on a two node volume, upgrading a node will
> > cause the volume to go down. That's nothing weird, you really should use
> > 3 nodes.
> > On Wed, Aug 23, 2017 at 06:51:55PM +0200, Gionatan Danti wrote:
> >> Il 23-08-2017 18:14 Pavel Szalbot ha scritto:
> >> > Hi, after many VM crashes during upgrades of Gluster, losing network
> >> > connectivity on one node etc. I would advise running replica 2 with
> >> > arbiter.
> >> Hi Pavel, this is bad news :(
> >> So, in your case at least, Gluster was not stable? Something as simple
> >> as an update would let it crash?
> >> > I once even managed to break this setup (with arbiter) due to network
> >> > partitioning - one data node never healed and I had to restore from
> >> > backups (it was easier and kind of non-production). Be extremely
> >> > careful and plan for failure.
> >> I would use VM locking via sanlock or virtlock, so a split brain should
> >> not cause simultaneous changes on both replicas. I am more concerned
> >> about volume heal time: what will happen if the standby node
> >> crashes/reboots? Will *all* data be re-synced from the master, or only
> >> changed bit will be re-synced? As stated above, I would like to avoid
> >> using sharding...
> >> Thanks.
> >> --
> >> Danti Gionatan
> >> Supporto Tecnico
> >> Assyoma S.r.l. - www.assyoma.it
> >> email: g.danti at assyoma.it - info at assyoma.it
> >> GPG public key ID: FF5F32A8
> >> _______________________________________________
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