[Gluster-users] Rebalancing in 3.1 not working

Craig Carl craig at gluster.com
Thu Dec 2 21:26:36 PST 2010


Dan -
     Gluster 3.1.1 s out, can you recreate the issue using that version? 
Please let us know.

http://www.gluster.com/community/documentation/index.php/Gluster_3.1_Filesystem_Installation_and_Configuration_Guide

Thanks,

Craig

-->
Craig Carl
Senior Systems Engineer
Gluster

On 11/21/2010 03:57 AM, Dan Bretherton wrote:
> Hello all-
> I have just added two replicated bricks (2x2) to a
> distributed-replicated volume.  When mounted the new size is correct
> (11TB) and the "gluster volume info" shows what I would expect.  However
> rebalancing the volume seems to have no effect, and happens almost
> instantaneously.  I expected it to take several hours because the
> original bricks have 5TB on them.  These are the commands I ran to start
> the rebalance and check the status.
>
> [root at bdan4 ~]# gluster volume rebalance atmos start
> starting rebalance on volume atmos has been successful
> [root at bdan4 ~]# gluster volume rebalance atmos status
> rebalance completed
>
> These are the last two messages in etc-glusterfs-glusterd.vol.log
>
> [2010-11-21 11:34:52.316470] I
> [glusterd-rebalance.c:292:glusterd_defrag_start] rebalance: rebalance on
> /etc/glusterd/mount/atmos complete
> [2010-11-21 11:35:04.653629] I
> [glusterd-rebalance.c:385:glusterd_handle_defrag_volume] glusterd:
> Received rebalance volume on atmos
>
> The messages look to me as if they are in the wrong order.  I confirmed
> this with another "gluster volume rebalance atmos status", which results
> in the message "Received rebalance volume on atmos".
>
> It wondered if it would have been better to add just one replicated
> brick at a time instead of two at once, but when I went to remove one of
> them I was scared off by the warning about possible data loss.  The new
> volume does seem to be working and some files are being put on the new
> bricks, but most seem to be going onto the original bricks which were
> ~80% full before the expansion.  I would like to press on and use the
> volume but I don't know what will happen when the original bricks get
> completely full, and there is also likely to be a performance penalty in
> using an un-balanced volume, as I understand it from reading previous
> mailing list postings.  Any suggestions would be much appreciated.
>
> Regards,
> -Dan
>
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