On Thu, Jun 21, 2018 at 8:41 PM, Pat Haley <pha...@mit.edu> wrote: > > 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? >
It impacts performance. > Thanks again. > > Pat > > > > On 06/21/2018 01:01 AM, Raghavendra Gowdappa wrote: > > > > On Thu, Jun 21, 2018 at 10:24 AM, Raghavendra Gowdappa < > rgowd...@redhat.com> 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 < >> rgowd...@redhat.com> wrote: >> >>> >>> >>> On Thu, Jun 21, 2018 at 8:32 AM, Raghavendra Gowdappa < >>> rgowd...@redhat.com> 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 >>> [2] https://bugzilla.redhat.com/show_bug.cgi?id=1214489 >>> >>> >>>> >>>> >>>> On Thu, Jun 21, 2018 at 5:00 AM, Pat Haley <pha...@mit.edu> 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). Specifically we were testing the suggestions in a >>>>> recent post (http://lists.gluster.org/pipe >>>>> rmail/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-May/030937.html >>>>> >>>>> Pat >>>>> >>>>> -- >>>>> >>>>> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- >>>>> Pat Haley Email: pha...@mit.edu >>>>> 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 >>>>> Gluster-users@gluster.org >>>>> http://lists.gluster.org/mailman/listinfo/gluster-users >>>> >>>> >>>> >>> >> > > -- > > -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- > Pat Haley Email: pha...@mit.edu > 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 > Gluster-users@gluster.org > http://lists.gluster.org/mailman/listinfo/gluster-users >
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