Hi Sander, It sounds to me, that it triggered the self-healing, which will do a scan on the bricks. Depending on the number of files on the brick, it can use a lot of CPU.
Does the logs say anything useful? Grtz, Jiri Hoogeveen > On 09 Apr 2015, at 14:18, Sander Zijlstra <[email protected]> wrote: > > LS, > > We have a GlusterFS cluster which consists of 4 nodes with one brick each and > a distributed-replicated volume of 72 TB. > > Today I extended the cluster to 8 machines and added new bricks to the > volume, so it now contains 8 bricks. > > I didn’t start the rebalance yet to limit the impact during the day but to my > surprise all glusterfsd process went sky high and performance was really > really bad. So effectively I cause downtime to our storage service while I > didn’t anticipated this, hence I didn’t do any rebalance yet. > > Can somebody explain to me why adding bricks to a volume causes this high CPU > usage? I can imagine the meta data needed to be synced but if this is so > heavy, why can’t I tune this? > > This is my current volume setup: > Volume Name: gv0 > Type: Distributed-Replicate > Volume ID: 0322f20f-e507-492b-91db-cb4c953a24eb > Status: Started > Number of Bricks: 4 x 2 = 8 > Transport-type: tcp > Bricks: > Brick1: s-s35-06:/glusterfs/bricks/brick1/brick > Brick2: s-s35-07:/glusterfs/bricks/brick1/brick > Brick3: s-s35-08:/glusterfs/bricks/brick1/brick > Brick4: s-s35-09:/glusterfs/bricks/brick1/brick > Brick5: v39-app-01:/glusterfs/bricks/brick1/gv0 > Brick6: v39-app-02:/glusterfs/bricks/brick1/gv0 > Brick7: v39-app-03:/glusterfs/bricks/brick1/gv0 > Brick8: v39-app-04:/glusterfs/bricks/brick1/gv0 > Options Reconfigured: > performance.cache-size: 256MB > nfs.disable: on > geo-replication.indexing: off > geo-replication.ignore-pid-check: on > changelog.changelog: on > performance.io-thread-count: 32 > performance.write-behind-window-size: 5MB > > Met vriendelijke groet / kind regards, > > Sander Zijlstra > > | Linux Engineer | SURFsara | Science Park 140 | 1098XG Amsterdam | T +31 > (0)6 43 99 12 47 | [email protected] > <mailto:[email protected]> | www.surfsara.nl > <http://www.surfsara.nl/> | > > Regular day off on friday > > _______________________________________________ > Gluster-users mailing list > [email protected] > http://www.gluster.org/mailman/listinfo/gluster-users
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