Hey Lincoln
On Tue, Sep 8, 2015 at 7:26 PM, Lincoln Bryant <linco...@uchicago.edu>
wrote:
> For whatever it’s worth, my problem has returned and is very similar to
> yours. Still trying to figure out what’s going on over here.
>
> Performance is nice for a few seconds, then goes to 0. This is a similar
> setup to yours (12 OSDs per box, Scientific Linux 6, Ceph 0.94.3, etc)
>
> 384 16 29520 29504 307.287 1188 0.0492006 0.208259
> 385 16 29813 29797 309.532 1172 0.0469708 0.206731
> 386 16 30105 30089 311.756 1168 0.0375764 0.205189
> 387 16 30401 30385 314.009 1184 0.036142 0.203791
> 388 16 30695 30679 316.231 1176 0.0372316 0.202355
> 389 16 30987 30971 318.42 1168 0.0660476 0.200962
> 390 16 31282 31266 320.628 1180 0.0358611 0.199548
> 391 16 31568 31552 322.734 1144 0.0405166 0.198132
> 392 16 31857 31841 324.859 1156 0.0360826 0.196679
> 393 16 32090 32074 326.404 932 0.0416869 0.19549
> 394 16 32205 32189 326.743 460 0.0251877 0.194896
> 395 16 32302 32286 326.897 388 0.0280574 0.194395
> 396 16 32348 32332 326.537 184 0.0256821 0.194157
> 397 16 32385 32369 326.087 148 0.0254342 0.193965
> 398 16 32424 32408 325.659 156 0.0263006 0.193763
> 399 16 32445 32429 325.054 84 0.0233839 0.193655
> 2015-09-08 11:22:31.940164 min lat: 0.0165045 max lat: 67.6184 avg lat:
> 0.193655
> sec Cur ops started finished avg MB/s cur MB/s last lat avg lat
> 400 16 32445 32429 324.241 0 - 0.193655
> 401 16 32445 32429 323.433 0 - 0.193655
> 402 16 32445 32429 322.628 0 - 0.193655
> 403 16 32445 32429 321.828 0 - 0.193655
> 404 16 32445 32429 321.031 0 - 0.193655
> 405 16 32445 32429 320.238 0 - 0.193655
> 406 16 32445 32429 319.45 0 - 0.193655
> 407 16 32445 32429 318.665 0 - 0.193655
>
> needless to say, very strange.
>
Its indeed very strange
( The solution that you gave me in the below email ) Have you tried
restarting all OSD's ?
By the way my problem got fixed ( but i am afraid , it can come back any
time ) by doing
# service ceph restart osd on all OSD nodes ( this didn't helped )
# set noout,nodown,nobackfill,norecover and then reboot all OSD nodes ( It
worked ) After they all the rados bench write started to work.
[ i know its hilarious , feels like i am watching *The IT Crowd* ' Hello
IT , Have you tried turning it OFF and ON again ' ]
It would be really helpful if someone provides a real solution.
>
> —Lincoln
>
>
> > On Sep 7, 2015, at 3:35 PM, Vickey Singh <vickey.singh22...@gmail.com>
> wrote:
> >
> > Adding ceph-users.
> >
> > On Mon, Sep 7, 2015 at 11:31 PM, Vickey Singh <
> vickey.singh22...@gmail.com> wrote:
> >
> >
> > On Mon, Sep 7, 2015 at 10:04 PM, Udo Lembke <ulem...@polarzone.de>
> wrote:
> > Hi Vickey,
> > Thanks for your time in replying to my problem.
> >
> > I had the same rados bench output after changing the motherboard of the
> monitor node with the lowest IP...
> > Due to the new mainboard, I assume the hw-clock was wrong during
> startup. Ceph health show no errors, but all VMs aren't able to do IO (very
> high load on the VMs - but no traffic).
> > I stopped the mon, but this don't changed anything. I had to restart all
> other mons to get IO again. After that I started the first mon also (with
> the right time now) and all worked fine again...
> >
> > Thanks i will try to restart all OSD / MONS and report back , if it
> solves my problem
> >
> > Another posibility:
> > Do you use journal on SSDs? Perhaps the SSDs can't write to garbage
> collection?
> >
> > No i don't have journals on SSD , they are on the same OSD disk.
> >
> >
> >
> > Udo
> >
> >
> > On 07.09.2015 16:36, Vickey Singh wrote:
> >> Dear Experts
> >>
> >> Can someone please help me , why my cluster is not able write data.
> >>
> >> See the below output cur MB/S is 0 and Avg MB/s is decreasing.
> >>
> >>
> >> Ceph Hammer 0.94.2
> >> CentOS 6 (3.10.69-1)
> >>
> >> The Ceph status says OPS are blocked , i have tried checking , what all
> i know
> >>
> >> - System resources ( CPU , net, disk , memory ) -- All normal
> >> - 10G network for public and cluster network -- no saturation
> >> - Add disks are physically healthy
> >> - No messages in /var/log/messages OR dmesg
> >> - Tried restarting OSD which are blocking operation , but no luck
> >> - Tried writing through RBD and Rados bench , both are giving same
> problemm
> >>
> >> Please help me to fix this problem.
> >>
> >> # rados bench -p rbd 60 write
> >> Maintaining 16 concurrent writes of 4194304 bytes for up to 60 seconds
> or 0 objects
> >> Object prefix: benchmark_data_stor1_1791844
> >> sec Cur ops started finished avg MB/s cur MB/s last lat avg
> lat
> >> 0 0 0 0 0 0 -
> 0
> >> 1 16 125 109 435.873 436 0.022076
> 0.0697864
> >> 2 16 139 123 245.948 56 0.246578
> 0.0674407
> >> 3 16 139 123 163.969 0 -
> 0.0674407
> >> 4 16 139 123 122.978 0 -
> 0.0674407
> >> 5 16 139 123 98.383 0 -
> 0.0674407
> >> 6 16 139 123 81.9865 0 -
> 0.0674407
> >> 7 16 139 123 70.2747 0 -
> 0.0674407
> >> 8 16 139 123 61.4903 0 -
> 0.0674407
> >> 9 16 139 123 54.6582 0 -
> 0.0674407
> >> 10 16 139 123 49.1924 0 -
> 0.0674407
> >> 11 16 139 123 44.7201 0 -
> 0.0674407
> >> 12 16 139 123 40.9934 0 -
> 0.0674407
> >> 13 16 139 123 37.8401 0 -
> 0.0674407
> >> 14 16 139 123 35.1373 0 -
> 0.0674407
> >> 15 16 139 123 32.7949 0 -
> 0.0674407
> >> 16 16 139 123 30.7451 0 -
> 0.0674407
> >> 17 16 139 123 28.9364 0 -
> 0.0674407
> >> 18 16 139 123 27.3289 0 -
> 0.0674407
> >> 19 16 139 123 25.8905 0 -
> 0.0674407
> >> 2015-09-07 15:54:52.694071min lat: 0.022076 max lat: 0.46117 avg lat:
> 0.0674407
> >> sec Cur ops started finished avg MB/s cur MB/s last lat avg
> lat
> >> 20 16 139 123 24.596 0 -
> 0.0674407
> >> 21 16 139 123 23.4247 0 -
> 0.0674407
> >> 22 16 139 123 22.36 0 -
> 0.0674407
> >> 23 16 139 123 21.3878 0 -
> 0.0674407
> >> 24 16 139 123 20.4966 0 -
> 0.0674407
> >> 25 16 139 123 19.6768 0 -
> 0.0674407
> >> 26 16 139 123 18.92 0 -
> 0.0674407
> >> 27 16 139 123 18.2192 0 -
> 0.0674407
> >> 28 16 139 123 17.5686 0 -
> 0.0674407
> >> 29 16 139 123 16.9628 0 -
> 0.0674407
> >> 30 16 139 123 16.3973 0 -
> 0.0674407
> >> 31 16 139 123 15.8684 0 -
> 0.0674407
> >> 32 16 139 123 15.3725 0 -
> 0.0674407
> >> 33 16 139 123 14.9067 0 -
> 0.0674407
> >> 34 16 139 123 14.4683 0 -
> 0.0674407
> >> 35 16 139 123 14.0549 0 -
> 0.0674407
> >> 36 16 139 123 13.6645 0 -
> 0.0674407
> >> 37 16 139 123 13.2952 0 -
> 0.0674407
> >> 38 16 139 123 12.9453 0 -
> 0.0674407
> >> 39 16 139 123 12.6134 0 -
> 0.0674407
> >> 2015-09-07 15:55:12.697124min lat: 0.022076 max lat: 0.46117 avg lat:
> 0.0674407
> >> sec Cur ops started finished avg MB/s cur MB/s last lat avg
> lat
> >> 40 16 139 123 12.2981 0 -
> 0.0674407
> >> 41 16 139 123 11.9981 0 -
> 0.0674407
> >>
> >>
> >>
> >>
> >> cluster 86edf8b8-b353-49f1-ab0a-a4827a9ea5e8
> >> health HEALTH_WARN
> >> 1 requests are blocked > 32 sec
> >> monmap e3: 3 mons at {stor0111=
> 10.100.1.111:6789/0,stor0113=10.100.1.113:6789/0,stor011
> >> 5=10.100.1.115:6789/0}
> >> election epoch 32, quorum 0,1,2 stor0111,stor0113,stor0115
> >> osdmap e19536: 50 osds: 50 up, 50 in
> >> pgmap v928610: 2752 pgs, 9 pools, 30476 GB data, 4183 kobjects
> >> 91513 GB used, 47642 GB / 135 TB avail
> >> 2752 active+clean
> >>
> >>
> >> Tried using RBD
> >>
> >>
> >> # dd if=/dev/zero of=file1 bs=4K count=10000 oflag=direct
> >> 10000+0 records in
> >> 10000+0 records out
> >> 40960000 bytes (41 MB) copied, 24.5529 s, 1.7 MB/s
> >>
> >> # dd if=/dev/zero of=file1 bs=1M count=100 oflag=direct
> >> 100+0 records in
> >> 100+0 records out
> >> 104857600 bytes (105 MB) copied, 1.05602 s, 9.3 MB/s
> >>
> >> # dd if=/dev/zero of=file1 bs=1G count=1 oflag=direct
> >> 1+0 records in
> >> 1+0 records out
> >> 1073741824 bytes (1.1 GB) copied, 293.551 s, 3.7 MB/s
> >> ]#
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> _______________________________________________
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> >>
> >> ceph-users@lists.ceph.com
> >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
> >
> >
> >
> > _______________________________________________
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>
>
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