On February 20, 2020 10:39:47 PM GMT+02:00, "Felix Kölzow" <felix.koelzow@xxxxxx> wrote: > >Dear Gluster-Experts, > > >we created a three-node setup with two bricks each and a dispersed >volume that can be > >accessed via the native client (glusterfs --version = 6.0). > > >The nodes are connected via 10Gbps (cat6,bonding mode 6). > > >If we running a performance test using the smallfile benchmark tool, > >./smallfile_cli.py --top ~/test6/ --file-size 16384 --threads 8 --files >1000 --response-times y --operation create > >we observing the > >behavior as shown in the attached figure. For a short time, we can >almost saturated the 10Gbps but > >then immediately network traffic is dropping almost to zero for about 5 >to 25 seconds. > >Actually, we don't have any glue what does causes this strange >behavior. >We had a lot of > >reconfigured volume options and now we are starting from scratch, i.e. > > >gluster volume reset dispersed_fuse all > > >and the current options looks like: > >Volume Name: dispersed_fuse >Type: Disperse >Volume ID: 45d3c7c9-526f-45ea-9930-ee7a2274a220 >Status: Started >Snapshot Count: 1 >Number of Bricks: 1 x (4 + 2) = 6 >Transport-type: tcp >Bricks: >Brick1: mimas:/gluster/vg00/dispersed_fuse/brick >Brick2: enceladus:/gluster/vg00/dispersed_fuse/brick >Brick3: tethys:/gluster/vg00/dispersed_fuse/brick >Brick4: mimas:/gluster/vg01/dispersed_fuse/brick >Brick5: enceladus:/gluster/vg01/dispersed_fuse/brick >Brick6: tethys:/gluster/vg01/dispersed_fuse/brick >Options Reconfigured: >client.event-threads: 16 >server.event-threads: 16 >performance.io-thread-count: 16 >geo-replication.ignore-pid-check: on >geo-replication.indexing: on >features.quota: off >features.inode-quota: off >nfs.disable: on >storage.fips-mode-rchecksum: on >server.outstanding-rpc-limit: 512 >server.root-squash: off >cluster.server-quorum-ratio: 51% >cluster.enable-shared-storage: enable > > >Any hints for root cause analysis are appreciated. > >Please let me know if you need more information. > > >Kind Regards, > >Felix Hi Felix, Usually for performance issues the devs need a little bit more details. In your case you can : 1. Test with real workload - as this is what you are going to do with the Gluster. If that is not possible, you can run the synthetic benchmark focusing on the workload that is closest to the real one. 2. Check the groups of options in /var/lib/gluster/groups . There is a 'profile' group for DB, Virtualization, small file workloads, etc . Play with those settings and adjust as necessary. 3. Obtain a gluster profile and use the 'top' command to gain more information about the pool's status. For details, check https://docs.gluster.org/en/latest/Administrator%20Guide/Monitoring%20Workload/ This information will allow more experienced adminiatrators and the developers to identify any pattern that could cause the symptoms. Tuning Gluster is one of the hardest topics, so you should prepare yourself for a lot of test untill you reach the optimal settings for your volumes. Best Regards, Strahil Nikolov ________ Community Meeting Calendar: APAC Schedule - Every 2nd and 4th Tuesday at 11:30 AM IST Bridge: https://bluejeans.com/441850968 NA/EMEA Schedule - Every 1st and 3rd Tuesday at 01:00 PM EDT Bridge: https://bluejeans.com/441850968 Gluster-users mailing list Gluster-users@xxxxxxxxxxx https://lists.gluster.org/mailman/listinfo/gluster-users
