Hi.
You need to read :
https://www.sebastien-han.fr/blog/2014/10/10/ceph-how-to-test-if-your-ssd-is-suitable-as-a-journal-device/
С уважением, Фасихов Ирек Нургаязович
Моб.: +79229045757
2016-02-12 10:41 GMT+03:00 Huan Zhang <huan.zhang...@gmail.com>:
> Hi,
>
> ceph VERY SLOW with 24 osd(SAMSUNG ssd).
> fio /dev/rbd0 iodepth=1 direct=1 IOPS only ~200
> fio /dev/rbd0 iodepth=32 direct=1 IOPS only ~3000
>
> But test single ssd deive with fio:
> fio iodepth=1 direct=1 IOPS ~15000
> fio iodepth=32 direct=1 IOPS ~30000
>
> Why ceph SO SLOW? Could you give me some help?
> Appreciated!
>
>
> My Enviroment:
> [root@szcrh-controller ~]# ceph -s
> cluster eb26a8b9-e937-4e56-a273-7166ffaa832e
> health HEALTH_WARN
> 1 mons down, quorum 0,1,2,3,4 ceph01,ceph02,ceph03,ceph04,
> ceph05
> monmap e1: 6 mons at {ceph01=
>
> 10.10.204.144:6789/0,ceph02=10.10.204.145:6789/0,ceph03=10.10.204.146:6789/0,ceph04=10.10.204.147:6789/0,ceph05=10.10.204.148:6789/0,ceph06=0.0.0.0:0/5
> }
> election epoch 6, quorum 0,1,2,3,4
> ceph01,ceph02,ceph03,ceph04,ceph05
> osdmap e114: 24 osds: 24 up, 24 in
> flags sortbitwise
> pgmap v2213: 1864 pgs, 3 pools, 49181 MB data, 4485 objects
> 144 GB used, 42638 GB / 42782 GB avail
> 1864 active+clean
>
> [root@ceph03 ~]# lsscsi
> [0:0:6:0] disk ATA SAMSUNG MZ7KM1T9 003Q /dev/sda
> [0:0:7:0] disk ATA SAMSUNG MZ7KM1T9 003Q /dev/sdb
> [0:0:8:0] disk ATA SAMSUNG MZ7KM1T9 003Q /dev/sdc
> [0:0:9:0] disk ATA SAMSUNG MZ7KM1T9 003Q /dev/sdd
>
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> ceph-users@lists.ceph.com
> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>
>
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