Hello Robert,
My disks did not reach 100% on the last warning, they climb to 70-80%
usage. But I see rrqm / wrqm counters increasing...
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz
avgqu-sz await r_await w_await svctm %util
sda 0.00 4.00 0.00 16.00 0.00 104.00 13.00
0.00 0.00 0.00 0.00 0.00 0.00
sdb 0.00 2.00 1.00 3456.00 8.00 25996.00 15.04
5.76 1.67 0.00 1.67 0.03 9.20
sdd 4.00 0.00 41462.00 1119.00 331272.00 7996.00
15.94 19.89 0.47 0.48 0.21 0.02 66.00
dm-0 0.00 0.00 6825.00 503.00 330856.00 7996.00 92.48
4.00 0.55 0.56 0.30 0.09 66.80
dm-1 0.00 0.00 1.00 1129.00 8.00 25996.00 46.02
1.03 0.91 0.00 0.91 0.09 10.00
sda is my system disk (SAMSUNG MZILS480HEGR/007 GXL0), sdb and sdd are
my OSDs
would "osd op queue = wpq" help in this case ?
Regards
Le sam. 8 juin 2019 à 07:44, Robert LeBlanc <rob...@leblancnet.us> a écrit :
> With the low number of OSDs, you are probably satuarting the disks. Check
> with `iostat -xd 2` and see what the utilization of your disks are. A lot
> of SSDs don't perform well with Ceph's heavy sync writes and performance is
> terrible.
>
> If some of your drives are 100% while others are lower utilization, you
> can possibly get more performance and greatly reduce the blocked I/O with
> the WPQ scheduler. In the ceph.conf add this to the [osd] section and
> restart the processes:
>
> osd op queue = wpq
> osd op queue cut off = high
>
> This has helped our clusters with fairness between OSDs and making
> backfills not so disruptive.
> ----------------
> Robert LeBlanc
> PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1
>
>
> On Thu, Jun 6, 2019 at 1:43 AM BASSAGET Cédric <
> cedric.bassaget...@gmail.com> wrote:
>
>> Hello,
>>
>> I see messages related to REQUEST_SLOW a few times per day.
>>
>> here's my ceph -s :
>>
>> root@ceph-pa2-1:/etc/ceph# ceph -s
>> cluster:
>> id: 72d94815-f057-4127-8914-448dfd25f5bc
>> health: HEALTH_OK
>>
>> services:
>> mon: 3 daemons, quorum ceph-pa2-1,ceph-pa2-2,ceph-pa2-3
>> mgr: ceph-pa2-3(active), standbys: ceph-pa2-1, ceph-pa2-2
>> osd: 6 osds: 6 up, 6 in
>>
>> data:
>> pools: 1 pools, 256 pgs
>> objects: 408.79k objects, 1.49TiB
>> usage: 4.44TiB used, 37.5TiB / 41.9TiB avail
>> pgs: 256 active+clean
>>
>> io:
>> client: 8.00KiB/s rd, 17.2MiB/s wr, 1op/s rd, 546op/s wr
>>
>>
>> Running ceph version 12.2.9 (9e300932ef8a8916fb3fda78c58691a6ab0f4217)
>> luminous (stable)
>>
>> I've check :
>> - all my network stack : OK ( 2*10G LAG )
>> - memory usage : ok (256G on each host, about 2% used per osd)
>> - cpu usage : OK (Intel(R) Xeon(R) CPU E5-2678 v3 @ 2.50GHz)
>> - disk status : OK (SAMSUNG AREA7680S5xnNTRI 3P04 => samsung DC series)
>>
>> I heard on IRC that it can be related to samsung PM / SM series.
>>
>> Do anybody here is facing the same problem ? What can I do to solve that ?
>> Regards,
>> Cédric
>> _______________________________________________
>> ceph-users mailing list
>> ceph-users@lists.ceph.com
>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>>
>
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