[Gluster-users] Slow write times to gluster disk

[Raghavendra Gowdappa]

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


On Thu, Jun 21, 2018 at 5:00 AM, Pat Haley <phaley at 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/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-May/030937.html
>
> Pat
>
> --
>
> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> Pat Haley                          Email:  phaley at 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
>
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