[Gluster-users] [Gluster-devel] 3.7.13 & proxmox/qemu

[Samuli Heinonen]

Hi all,

I’m running oVirt 3.6 and Gluster 3.7 with ZFS backend. All hypervisor and storage nodes have CentOS 7. I was planning to upgrade to 3.7.13 during weekend but i’ll probably wait for more information on this issue.

Afaik ZFS on Linux doesn’t support aio. Has there been some changes to GlusterFS regarding aio?

Best regards,
Samuli heinonen

> On 21 Jul 2016, at 21:00, David Gossage <dgossage at carouselchecks.com> wrote:
> 
> On Thu, Jul 21, 2016 at 12:48 PM, David Gossage <dgossage at carouselchecks.com> wrote:
> On Thu, Jul 21, 2016 at 9:58 AM, David Gossage <dgossage at carouselchecks.com> wrote:
> On Thu, Jul 21, 2016 at 9:52 AM, Niels de Vos <ndevos at redhat.com> wrote:
> On Sun, Jul 10, 2016 at 10:49:52AM +1000, Lindsay Mathieson wrote:
> > Did a quick test this morning - 3.7.13 is now working with libgfapi - yay!
> >
> >
> > However I do have to enable write-back or write-through caching in qemu
> > before the vm's will start, I believe this is to do with aio support. Not a
> > problem for me.
> >
> > I see there are settings for storage.linux-aio and storage.bd-aio - not sure
> > as to whether they are relevant or which ones to play with.
> 
> Both storage.*-aio options are used by the brick processes. Depending on
> what type of brick you have (linux = filesystem, bd = LVM Volume Group)
> you could enable the one or the other.
> 
> We do have a strong suggestion to set these "gluster volume group .."
> options:
>   https://github.com/gluster/glusterfs/blob/master/extras/group-virt.example
> 
> From those options, network.remote-dio seems most related to your aio
> theory. It was introduced with http://review.gluster.org/4460 that
> contains some more details.
> 
> 
> Wonder if this may be related at all
> 
> * #1347553: O_DIRECT support for sharding
> https://bugzilla.redhat.com/show_bug.cgi?id=1347553
> 
> Is it possible to downgrade from 3.8 back to 3.7.x 
> 
> Building test box right now anyway but wondering.
> 
> May be anecdotal with small sample size but the few people who have had issue all seemed to have zfs backed gluster volumes.
> 
> Now that i recall back to the day I updated.  The gluster volume on xfs I use for my hosted engine never had issues.
>  
> 
>  
> 
> Thanks with the exception of stat-prefetch I have those enabled 
> I could try turning that back off though at the time of update to 3.7.13 it was off.  I didnt turn it back on till later in next week after downgrading back to 3.7.11.  
> 
> Number of Bricks: 1 x 3 = 3
> Transport-type: tcp
> Bricks:
> Brick1: ccgl1.gl.local:/gluster1/BRICK1/1
> Brick2: ccgl2.gl.local:/gluster1/BRICK1/1
> Brick3: ccgl4.gl.local:/gluster1/BRICK1/1
> Options Reconfigured:
> diagnostics.brick-log-level: WARNING
> features.shard-block-size: 64MB
> features.shard: on
> performance.readdir-ahead: on
> storage.owner-uid: 36
> storage.owner-gid: 36
> performance.quick-read: off
> performance.read-ahead: off
> performance.io-cache: off
> performance.stat-prefetch: on
> cluster.eager-lock: enable
> network.remote-dio: enable
> cluster.quorum-type: auto
> cluster.server-quorum-type: server
> server.allow-insecure: on
> cluster.self-heal-window-size: 1024
> cluster.background-self-heal-count: 16
> performance.strict-write-ordering: off
> nfs.disable: on
> nfs.addr-namelookup: off
> nfs.enable-ino32: off
> 
> 
> HTH,
> Niels
> 
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