[Gluster-users] Slow write times to gluster disk

[Raghavendra Gowdappa]

On Thu, Jun 21, 2018 at 8:32 AM, Raghavendra Gowdappa <rgowdapp at 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 <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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>
>
>
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