12:14 a.m.
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On 09/18/2017 10:08 AM, Alex K wrote:
Hi Ravishankar,
I am not referring to the arbiter volume(which is showing 0% usage). I
am referring to the other 2 volumes which are replicas and should have
the exact same data. Checking the status of other bricks in ovirt
(bricks used from iso and export domain) I see that they all report
same usage of data on the data volumes, except the "vms" volume used
for storing vms.
Ah, okay. Some of the things that can cause a variation in disk usage:
- Pending self-heals in gluster (check if `gluster volume heal <volname>
info` doesn't show any entries. Also if there is anything under
`.glusterfs/landfill` folder of the bricks).
- XFS speculative preallocation
- Possibly some bug in self-healing of sparse files by gluster (although
we fixed known bugs a long time back in this area).
Regards
Ravi
Thanx,
Alex
On Sep 18, 2017 07:00, "Ravishankar N" <ravishankar(a)redhat.com
<mailto:ravishankar@redhat.com>> wrote:
On 09/17/2017 08:41 PM, Alex K wrote:
> Hi all,
>
> I have replica 3 with 1 arbiter.
> When checking the gluster volume bricks they are reported as
> using different space, as per attached. How come they use
> different space? One would expect to use exactly the same space
> since they are replica.
>
The 3rd brick (arbiter ) only holds meta data, so it would not
consume as much space as the other 2 data bricks. So what you are
seeing is expected behaviour.
Regards,
Ravi
> Thanx,
> Alex
>
>
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<div class="moz-cite-prefix">On 09/18/2017 10:08 AM, Alex K
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CABMULtLUPA=6U+YMBo2CT7VQvPqdK6Cx_jaQVZQBJmnjZejJDg@mail.gmail.com">
<div dir="auto">Hi Ravishankar,
<div dir="auto"><br>
</div>
<div dir="auto">I am not referring to the arbiter volume(which
is showing 0% usage). I am referring to the other 2 volumes
which are replicas and should have the exact same data.
Checking the status of other bricks in ovirt (bricks used from
iso and export domain) I see that they all report same usage
of data on the data volumes, except the "vms" volume used for
storing vms.</div>
</div>
</blockquote>
<br>
Ah, okay. Some of the things that can cause a variation in disk
usage:<br>
- Pending self-heals in gluster (check if `gluster volume heal
<volname> info` doesn't show any entries. Also if there is
anything under `.glusterfs/landfill` folder of the bricks).<br>
- XFS speculative preallocation <br>
- Possibly some bug in self-healing of sparse files by gluster
(although we fixed known bugs a long time back in this area).<br>
<br>
Regards<br>
Ravi<br>
<br>
<blockquote type="cite"
cite="mid:CABMULtLUPA=6U+YMBo2CT7VQvPqdK6Cx_jaQVZQBJmnjZejJDg@mail.gmail.com">
<div dir="auto">
<div dir="auto"><br>
</div>
<div dir="auto">Thanx,</div>
<div dir="auto">Alex</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Sep 18, 2017 07:00, "Ravishankar
N"
<<a href="mailto:ravishankar@redhat.com"
moz-do-not-send="true">ravishankar(a)redhat.com</a>&gt;
wrote:<br
type="attribution">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<p><br>
</p>
<br>
<div class="m_4192326122491279784moz-cite-prefix">On
09/17/2017 08:41 PM, Alex K wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>
<div>
<div>
<div>Hi all, <br>
<br>
</div>
I have replica 3 with 1 arbiter. <br>
</div>
When checking the gluster volume bricks they are
reported as using different space, as per
attached. How come they use different space? One
would expect to use exactly the same space since
they are replica. <br>
<br>
</div>
</div>
</div>
</blockquote>
The 3rd brick (arbiter ) only holds meta data, so it would
not consume as much space as the other 2 data bricks. So
what you are seeing is expected behaviour.<br>
Regards,<br>
Ravi<br>
<blockquote type="cite">
<div dir="ltr">
<div>Thanx, <br>
</div>
Alex<br>
</div>
<br>
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