Hi Raghavendra,
Thanks for the suggestions. Our technician will be in on Monday. We'll test then and let you know the results.
One question I have, is the "group metadata-cache" option supposed to directly impact the performance or is it to help collect data? If the latter, where will the data be located?
Thanks again. Pat On 06/21/2018 01:01 AM, Raghavendra Gowdappa wrote:
On Thu, Jun 21, 2018 at 10:24 AM, Raghavendra Gowdappa <[email protected] <mailto:[email protected]>> wrote:For the case of writes to glusterfs mount, I saw in earlier conversations that there are too many lookups, but small number of writes. Since writes cached in write-behind would invalidate metadata cache, lookups won't be absorbed by md-cache. I am wondering what would results look like if we turn off performance.write-behind. @Pat, Can you set, # gluster volume set <volname> performance.write-behind off Please turn on "group metadata-cache" for write tests too. and redo the tests writing to glusterfs mount? Let us know about the results you see. regards, Raghavendra On Thu, Jun 21, 2018 at 8:33 AM, Raghavendra Gowdappa <[email protected] <mailto:[email protected]>> wrote: On Thu, Jun 21, 2018 at 8:32 AM, Raghavendra Gowdappa <[email protected] <mailto:[email protected]>> wrote: For the case of reading from Glusterfs mount, read-ahead should help. However, we've known issues with read-ahead[1][2]. To work around these, can you try with, 1. Turn off performance.open-behind #gluster volume set <volname> performance.open-behind off 2. enable group meta metadata-cache # gluster volume set <volname> group metadata-cache [1] https://bugzilla.redhat.com/show_bug.cgi?id=1084508 <https://bugzilla.redhat.com/show_bug.cgi?id=1084508> [2] https://bugzilla.redhat.com/show_bug.cgi?id=1214489 <https://bugzilla.redhat.com/show_bug.cgi?id=1214489> On Thu, Jun 21, 2018 at 5:00 AM, Pat Haley <[email protected] <mailto:[email protected]>> wrote: Hi, We were recently revisiting our problems with the slowness of gluster writes (http://lists.gluster.org/pipermail/gluster-users/2017-April/030529.html <http://lists.gluster.org/pipermail/gluster-users/2017-April/030529.html>). Specifically we were testing the suggestions in a recent post (http://lists.gluster.org/pipermail/gluster-users/2018-March/033699.html <http://lists.gluster.org/pipermail/gluster-users/2018-March/033699.html>). The first two suggestions (specifying a negative-timeout in the mount settings or adding rpc-auth-allow-insecure to glusterd.vol) did not improve our performance, while setting "disperse.eager-lock off" provided a tiny (5%) speed-up. Some of the various tests we have tried earlier can be seen in the links below. Do any of the above observations suggest what we could try next to either improve the speed or debug the issue? Thanks http://lists.gluster.org/pipermail/gluster-users/2017-June/031565.html <http://lists.gluster.org/pipermail/gluster-users/2017-June/031565.html> http://lists.gluster.org/pipermail/gluster-users/2017-May/030937.html <http://lists.gluster.org/pipermail/gluster-users/2017-May/030937.html> Pat---=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Pat Haley Email: [email protected] <mailto:[email protected]> Center for Ocean Engineering Phone: (617) 253-6824 Dept. of Mechanical Engineering Fax: (617) 253-8125 MIT, Room 5-213 http://web.mit.edu/phaley/www/ 77 Massachusetts Avenue Cambridge, MA 02139-4301 _______________________________________________ Gluster-users mailing list [email protected] <mailto:[email protected]> http://lists.gluster.org/mailman/listinfo/gluster-users <http://lists.gluster.org/mailman/listinfo/gluster-users>
-- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Pat Haley Email: [email protected] Center for Ocean Engineering Phone: (617) 253-6824 Dept. of Mechanical Engineering Fax: (617) 253-8125 MIT, Room 5-213 http://web.mit.edu/phaley/www/ 77 Massachusetts Avenue Cambridge, MA 02139-4301
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