Gluster users - Aug 2017 - GlusterFS as virtual machine storage

> This is true even if I manage locking at application level (via virlock 
> or sanlock)?
Yes. Gluster has it's own quorum, you can disable it but that's just a
recipe for a disaster.
> Also, on a two-node setup it is *guaranteed* for updates to one node to 
> put offline the whole volume?
I think so, but I never took the chance so who knows.
> On the other hand, a 3-way setup (or 2+arbiter) if free from all these 
> problems?
> 
Free from a lot of problems, but apparently not as good as a replica 3
volume. I can't comment on arbiter, I only have replica 3 clusters. I
can tell you that my colleagues setting up 2 nodes clusters have _a lot_
of problems.
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Il 25-08-2017 10:50 lemonnierk at ulrar.net ha scritto:
> Yes. Gluster has it's own quorum, you can disable it but that's
just a
> recipe for a disaster.
> 
> Free from a lot of problems, but apparently not as good as a replica 3
> volume. I can't comment on arbiter, I only have replica 3 clusters. I
> can tell you that my colleagues setting up 2 nodes clusters have _a 
> lot_
> of problems.
Thanks, these are very valuable informations.

-- 
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

On 25/08/2017 6:50 PM, lemonnierk at ulrar.net wrote:
> Free from a lot of problems, but apparently not as good as a replica 3
> volume. I can't comment on arbiter, I only have replica 3 clusters. I
> can tell you that my colleagues setting up 2 nodes clusters have_a lot_
> of problems.
I run Replica 3 VM hosting (gfapi) via a 3 node proxmox cluster. Have 
done a lot of rolling node updates, power failures etc, never had a 
problem. Performance is better than any other DFS I've tried (Ceph, 
lizard/moose). Never did get DRDB working.


nb: ZFS Bricks, with each brick RAID10 - so a little paranoid on the 
redundancy :)


For me, glusters biggest problem is its lack of flexibility in adding 
bricks and nodes.

-- 
Lindsay Mathieson

On 25/08/2017 6:50 PM, lemonnierk at ulrar.net wrote:
> Free from a lot of problems, but apparently not as good as a replica 3
> volume. I can't comment on arbiter, I only have replica 3 clusters. I
> can tell you that my colleagues setting up 2 nodes clusters have_a lot_
> of problems.
I run Replica 3 VM hosting (gfapi) via a 3 node proxmox cluster. Have 
done a lot of rolling node updates, power failures etc, never had a 
problem. Performance is better than any other DFS I've tried (Ceph, 
lizard/moose). Never did get DRDB working.


nb: ZFS Bricks, with each brick RAID10 - so a little paranoid on the 
redundancy :)


For me, glusters biggest problem is its lack of flexibility in adding 
bricks and nodes.And replacing them is an exercise in nail biting.? 
Hoping V4 improves on this though maybe that will lead to performance 
trade offs.

-- 
Lindsay Mathieson

Il 25-08-2017 14:22 Lindsay Mathieson ha scritto:
> On 25/08/2017 6:50 PM, lemonnierk at ulrar.net wrote:
> 
> I run Replica 3 VM hosting (gfapi) via a 3 node proxmox cluster. Have
> done a lot of rolling node updates, power failures etc, never had a
> problem. Performance is better than any other DFS I've tried (Ceph,
> lizard/moose).
Hi, very interesting! Are you using client or server quorum?
> Never did get DRDB working.
This surprise me: I found DRBD quite simple to use, albeit I mostly use 
active/passive setup in production (with manual failover)
> nb: ZFS Bricks, with each brick RAID10 - so a little paranoid on the
> redundancy :)
Yeah, I remember you on the zfs-discuss mailing list ;)
> For me, glusters biggest problem is its lack of flexibility in adding
> bricks and nodes.And replacing them is an exercise in nail biting.?
> Hoping V4 improves on this though maybe that will lead to performance
> trade offs.
Can you elaborate? What are the biggest problems/inconvenience?

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