[ovirt-users] How to create a new Gluster volume

[Gianluca Cecchi]

On Fri, Jul 7, 2017 at 10:15 AM, knarra <knarra at redhat.com> wrote:

>
>
>>
> It seems I have to de-select the checkbox "Show available bricks from
> host" and so I can manually the the directory of the bricks
>
> I see that bricks are mounted in /gluster/brick3 and that is the reason it
> does not show anything in "Brick Directory" drop down filed. If bricks are
> mounted under /gluster_bricks then it would have detected automatically.
> There is an RFE which is raised to detect bricks which are created manually.
>

I deployed this HCI system with gdeploy at oVirt 4.05 time, so I think I
used the "default" path that was proposed inside the ovirt-gluster.conf
file to feed gdeploy with...
I think it was based on this from Jason:
https://www.ovirt.org/blog/2016/08/up-and-running-with-ovirt-4-0-and-gluster-storage/
and this conf file
https://gist.githubusercontent.com/jasonbrooks/a5484769eea5a8cf2fa9d32329d5ebe5/raw/ovirt-gluster.conf

Good that there is an RFE. Thanks



>
>
> BTW: I see that after creating a volume optimized for oVirt in web admin
> gui of 4.1.2 I get slight option for it in respect for a pre-existing
> volume created in 4.0.5 during initial setup with gdeploy.
>
> NOTE: during 4.0.5 setup I had gluster 3.7 installed, while now I have
> gluster 3.10 (manually updated from CentOS storage SIG)
>
> Making a "gluster volume info" and then a diff of the output for the 2
> volumes I have:
>
> new volume ==   <
> old volume  ==    >
>
> < cluster.shd-max-threads: 8
> ---
> > cluster.shd-max-threads: 6
> 13a13,14
> > features.shard-block-size: 512MB
> 16c17
> < network.remote-dio: enable
> ---
> > network.remote-dio: off
> 23a25
> > performance.readdir-ahead: on
> 25c27
> < server.allow-insecure: on
> ---
> > performance.strict-o-direct: on
>
> Do I have to change anything for the newly created one?
>
> No, you do not need to change anything for the new volume. But if you plan
> to enable o-direct on the volume then you will have to disable/turn off
> remote-dio.
>
>
> OK.
Again, in ovirt-gluster.conf file I see there was this kind of setting for
the Gluster volumes when running gdeploy for them:

key=group,storage.owner-uid,storage.owner-gid,features.shard,features.shard-block-size,performance.low-prio-threads,cluster.data-self-heal-algorithm,cluster.locking-scheme,cluster.shd-wait-qlength,cluster.shd-max-threads,network.ping-timeout,user.cifs,performance.strict-o-direct,network.remote-dio,cluster.granular-entry-heal
value=virt,36,36,on,512MB,32,full,granular,10000,8,30,off,on,off,on
brick_dirs=/gluster/brick1/engine

I'm going to crosscheck now what are the suggested values for oVirt 4.1 and
Gluster 3.10 combined...

I was in particular worried by the difference of features.shard-block-size
but after reading this

http://blog.gluster.org/2015/12/introducing-shard-translator/

I'm not sure if 512Mb is the best in case of VMs storage.... I'm going to
dig more eventually

Thanks,
Gianluca
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