[Rdo-list] read only volumes when glusterfs fails

[JuanFra Rodriguez Cardoso]

Hi Elias:

This Joe Julian's post may help you to solve that trouble:

http://joejulian.name/blog/keeping-your-vms-from-going-read-only-when-encountering-a-ping-timeout-in-glusterfs/

Regards,
---
JuanFra Rodriguez Cardoso

2014-09-11 3:21 GMT+02:00 Elías David <elias.moreno.tec at gmail.com>:

> Hello,
>
> I'm seeing a constant behaviour with my implementation of openstack
> (libvirt/kvm) and cinder using glusterfs and I'm having troubles to find
> the real cause or if it's something not normal at all.
>
> I have configured cinder to use glusterfs as storage backend, the volume
> is a replica 2 of 8 disks in 2 servers and I have several volumes attached
> to several instances provided by cinder. The problem is this, is not
> uncommon that one of the gluster servers reboot suddenly due to power
> failures (this is an infrastructure problem unavoidable right now), when
> this happens the instances start to see the attached volume as read only
> which force me to hard reboot the instance so it can access the volume
> normally again.
>
> Here are my doubts, the gluster volume is created in such a way that not a
> single replica is on the same server as the master, if I lose a server due
> to hardware failure, the other is still usable so I don't really understand
> why couldn't the instances just use the replica brick in case that one of
> the servers reboots.
>
> Also, why the data is still there, can be read but can't be written to in
> case of glusterfs failures? Is this a problem with my implementation?
> configuration error on my part? something known to openstack? a cinder
> thing? libvirt? glusterfs?
>
> Having to hard reboot the instances is not a big issue right now, but
> nevertheless I want to understand what's happening and if I can avoid this
> issue.
>
> Some specifics:
>
> GlusterFS version is 3.5 All systems are CentOS 6.5 Openstack version is
> Icehouse installed with packstack/rdo
>
> Thanks in advance!
>
> --
> Elías David.
>
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