[ovirt-users] gluster replica volumes with different data usage

[Kasturi Narra]

Recommended would be creating a new storage domain with shard size as 64 MB
and migrating all the disks from 4MB storagedomain

On Mon, Sep 18, 2017 at 12:01 PM, Ravishankar N <ravishankar at redhat.com>
wrote:

> Possibly.  I don't think changing shard size on the fly is supported,
> especially when there are files on the volume that are sharded with a
> different size.
>
> -Ravi
>
>
> On 09/18/2017 11:40 AM, Alex K wrote:
>
> The heal status is showing that no pending files need healing (also shown
> at GUI).
> When checking the bricks on the file system I see that what is different
> between the server is the .shard folder of the volume. One server reports
> 835GB while the other 1.1 TB.
> I recall to have changed the shard size at some point from 4 MB to 64MB.
> Could this be the cause?
>
> Thanx,
> Alex
>
> On Mon, Sep 18, 2017 at 8:14 AM, Ravishankar N <ravishankar at redhat.com>
> wrote:
>
>>
>> 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 at 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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>>>
>>>
>>
>
>
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