Please note that these suggestions are for native fuse mount. 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 > > 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 >>> >>> >>> >> >
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