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

[Ravishankar N]

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 
> <mailto: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
>>     <mailto: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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