We have CephFS utilizing a cache tier + EC backend. The cache tier and ec pool
sit on the same spinners — no SSDs. Our cache tier has a target_max_bytes of
5TB and the total storage is about 1PB.
I do have a separate test pool with 3x replication and no cache tier, and I
still see significant performance drops and blocked ops with no/minimal client
I/O from CephFS. Right now I have 530 blocked ops with 20MB/s of client write
I/O and no active scrubs. The rados bench on my test pool looks like this:
sec Cur ops started finished avg MB/s cur MB/s last lat avg lat
0 0 0 0 0 0 - 0
1 31 94 63 251.934 252 0.31017 0.217719
2 31 103 72 143.969 36 0.978544 0.260631
3 31 103 72 95.9815 0 - 0.260631
4 31 111 80 79.9856 16 2.29218 0.476458
5 31 112 81 64.7886 4 2.5559 0.50213
6 31 112 81 53.9905 0 - 0.50213
7 31 115 84 47.9917 6 3.71826 0.615882
8 31 115 84 41.9928 0 - 0.615882
9 31 115 84 37.327 0 - 0.615882
10 31 117 86 34.3942 2.66667 6.73678 0.794532
I’m really leaning more toward it being a weird controller/disk problem.
As a test, I suppose I could double the target_max_bytes, just so the cache
tier stops evicting while client I/O is writing?
—Lincoln
> On Sep 17, 2015, at 11:59 AM, Nick Fisk <[email protected]> wrote:
>
> Ah right....this is where it gets interesting.
>
> You are probably hitting a cache full on a PG somewhere which is either
> making everything wait until it flushes or something like that.
>
> What cache settings have you got set?
>
> I assume you have SSD's for the cache tier? Can you share the size of the
> pool.
>
> If possible could you also create a non tiered test pool and do some
> benchmarks on that to rule out any issue with the hardware and OSD's.
>
>> -----Original Message-----
>> From: ceph-users [mailto:[email protected]] On Behalf Of
>> Lincoln Bryant
>> Sent: 17 September 2015 17:54
>> To: Nick Fisk <[email protected]>
>> Cc: [email protected]
>> Subject: Re: [ceph-users] Ceph cluster NO read / write performance :: Ops
>> are blocked
>>
>> Hi Nick,
>>
>> Thanks for responding. Yes, I am.
>>
>> —Lincoln
>>
>>> On Sep 17, 2015, at 11:53 AM, Nick Fisk <[email protected]> wrote:
>>>
>>> You are getting a fair amount of reads on the disks whilst doing these
>> writes. You're not using cache tiering are you?
>>>
>>>> -----Original Message-----
>>>> From: ceph-users [mailto:[email protected]] On Behalf
>>>> Of Lincoln Bryant
>>>> Sent: 17 September 2015 17:42
>>>> To: [email protected]
>>>> Subject: Re: [ceph-users] Ceph cluster NO read / write performance ::
>>>> Ops are blocked
>>>>
>>>> Hello again,
>>>>
>>>> Well, I disabled offloads on the NIC -- didn’t work for me. I also
>>>> tried setting net.ipv4.tcp_moderate_rcvbuf = 0 as suggested elsewhere
>>>> in the thread to no avail.
>>>>
>>>> Today I was watching iostat on an OSD box ('iostat -xm 5') when the
>>>> cluster got into “slow” state:
>>>>
>>>> Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz
>>>> avgqu-
>> sz
>>>> await svctm %util
>>>> sdb 0.00 13.57 84.23 167.47 0.45 2.78 26.26
>>>> 2.06 8.18
>> 3.85
>>>> 96.93
>>>> sdc 0.00 46.71 5.59 289.22 0.03 2.54 17.85
>>>> 3.18 10.77
>> 0.97
>>>> 28.72
>>>> sdd 0.00 16.57 45.11 91.62 0.25 0.55 12.01
>>>> 0.75 5.51
>> 2.45
>>>> 33.47
>>>> sde 0.00 13.57 6.99 143.31 0.03 2.53 34.97
>>>> 1.99 13.27
>> 2.12
>>>> 31.86
>>>> sdf 0.00 18.76 4.99 158.48 0.10 1.09 14.88
>>>> 1.26 7.69 1.24
>>>> 20.26
>>>> sdg 0.00 25.55 81.64 237.52 0.44 2.89 21.36
>>>> 4.14 12.99
>> 2.58
>>>> 82.22
>>>> sdh 0.00 89.42 16.17 492.42 0.09 3.81 15.69
>>>> 17.12 33.66
>> 0.73
>>>> 36.95
>>>> sdi 0.00 20.16 17.76 189.62 0.10 1.67 17.46
>>>> 3.45 16.63
>> 1.57
>>>> 32.55
>>>> sdj 0.00 31.54 0.00 185.23 0.00 1.91 21.15
>>>> 3.33 18.00
>> 0.03
>>>> 0.62
>>>> sdk 0.00 26.15 2.40 133.33 0.01 0.84 12.79
>>>> 1.07 7.87
>> 0.85
>>>> 11.58
>>>> sdl 0.00 25.55 9.38 123.95 0.05 1.15 18.44
>>>> 0.50 3.74 1.58
>>>> 21.10
>>>> sdm 0.00 6.39 92.61 47.11 0.47 0.26 10.65
>>>> 1.27 9.07
>> 6.92
>>>> 96.73
>>>>
>>>> The %util is rather high on some disks, but I’m not an expert at
>>>> looking at iostat so I’m not sure how worrisome this is. Does
>>>> anything here stand out to anyone?
>>>>
>>>> At the time of that iostat, Ceph was reporting a lot of blocked ops
>>>> on the OSD associated with sde (as well as about 30 other OSDs), but
>>>> it doesn’t look all that busy. Some simple ‘dd’ tests seem to indicate the
>> disk is fine.
>>>>
>>>> Similarly, iotop seems OK on this host:
>>>>
>>>> TID PRIO USER DISK READ DISK WRITE SWAPIN IO> COMMAND
>>>> 472477 be/4 root 0.00 B/s 5.59 M/s 0.00 % 0.57 % ceph-osd -i
>>>> 111 --
>> pid-
>>>> file /var/run/ceph/osd.111.pid -c /etc/ceph/ceph.conf --cluster ceph
>>>> 470621 be/4 root 0.00 B/s 10.09 M/s 0.00 % 0.40 % ceph-osd -i
>>>> 111 --
>> pid-
>>>> file /var/run/ceph/osd.111.pid -c /etc/ceph/ceph.conf --cluster ceph
>>>> 3495447 be/4 root 0.00 B/s 272.19 K/s 0.00 % 0.36 % ceph-osd -i
>>>> 114 --
>>>> pid-file /var/run/ceph/osd.114.pid -c /etc/ceph/ceph.conf --cluster ceph
>>>> 3488389 be/4 root 0.00 B/s 596.80 K/s 0.00 % 0.16 % ceph-osd -i 109 --
>>>> pid-file /var/run/ceph/osd.109.pid -c /etc/ceph/ceph.conf --cluster ceph
>>>> 3488060 be/4 root 0.00 B/s 600.83 K/s 0.00 % 0.15 % ceph-osd -i
>>>> 108 --
>>>> pid-file /var/run/ceph/osd.108.pid -c /etc/ceph/ceph.conf --cluster ceph
>>>> 3505573 be/4 root 0.00 B/s 528.25 K/s 0.00 % 0.10 % ceph-osd -i
>>>> 119 --
>>>> pid-file /var/run/ceph/osd.119.pid -c /etc/ceph/ceph.conf --cluster ceph
>>>> 3495434 be/4 root 0.00 B/s 2.02 K/s 0.00 % 0.10 % ceph-osd -i
>>>> 114 --
>> pid-
>>>> file /var/run/ceph/osd.114.pid -c /etc/ceph/ceph.conf --cluster ceph
>>>> 3502327 be/4 root 0.00 B/s 506.07 K/s 0.00 % 0.09 % ceph-osd -i
>>>> 118 --
>>>> pid-file /var/run/ceph/osd.118.pid -c /etc/ceph/ceph.conf --cluster ceph
>>>> 3489100 be/4 root 0.00 B/s 106.86 K/s 0.00 % 0.09 % ceph-osd -i
>>>> 110 --
>>>> pid-file /var/run/ceph/osd.110.pid -c /etc/ceph/ceph.conf --cluster ceph
>>>> 3496631 be/4 root 0.00 B/s 229.85 K/s 0.00 % 0.05 % ceph-osd -i
>>>> 115 --
>>>> pid-file /var/run/ceph/osd.115.pid -c /etc/ceph/ceph.conf --cluster ceph
>>>> 3505561 be/4 root 0.00 B/s 2.02 K/s 0.00 % 0.03 % ceph-osd -i 119 --
>>>> pid-file /var/run/ceph/osd.119.pid -c /etc/ceph/ceph.conf --cluster ceph
>>>> 3488059 be/4 root 0.00 B/s 2.02 K/s 0.00 % 0.03 % ceph-osd -i
>>>> 108 --
>> pid-
>>>> file /var/run/ceph/osd.108.pid -c /etc/ceph/ceph.conf --cluster ceph
>>>> 3488391 be/4 root 46.37 K/s 431.47 K/s 0.00 % 0.02 % ceph-osd -i
>>>> 109 -
>> -
>>>> pid-file /var/run/ceph/osd.109.pid -c /etc/ceph/ceph.conf --cluster ceph
>>>> 3500639 be/4 root 0.00 B/s 221.78 K/s 0.00 % 0.02 % ceph-osd -i
>>>> 117 --
>>>> pid-file /var/run/ceph/osd.117.pid -c /etc/ceph/ceph.conf --cluster ceph
>>>> 3488392 be/4 root 34.28 K/s 185.49 K/s 0.00 % 0.02 % ceph-osd -i
>>>> 109 -
>> -
>>>> pid-file /var/run/ceph/osd.109.pid -c /etc/ceph/ceph.conf --cluster ceph
>>>> 3488062 be/4 root 4.03 K/s 66.54 K/s 0.00 % 0.02 % ceph-osd -i
>>>> 108 --
>> pid-
>>>> file /var/run/ceph/osd.108.pid -c /etc/ceph/ceph.conf --cluster ceph
>>>>
>>>> These are all 6TB seagates in single-disk RAID 0 on a PERC H730 Mini
>>>> controller.
>>>>
>>>> I did try removing the disk with 20k non-medium errors, but that
>>>> didn’t seem to help.
>>>>
>>>> Thanks for any insight!
>>>>
>>>> Cheers,
>>>> Lincoln Bryant
>>>>
>>>>> On Sep 9, 2015, at 1:09 PM, Lincoln Bryant <[email protected]>
>> wrote:
>>>>>
>>>>> Hi Jan,
>>>>>
>>>>> I’ll take a look at all of those things and report back (hopefully
>>>>> :))
>>>>>
>>>>> I did try setting all of my OSDs to writethrough instead of
>>>>> writeback on the
>>>> controller, which was significantly more consistent in performance
>>>> (from 1100MB/s down to 300MB/s, but still occasionally dropping to
>>>> 0MB/s). Still plenty of blocked ops.
>>>>>
>>>>> I was wondering if not-so-nicely failing OSD(s) might be the cause.
>>>>> My
>>>> controller (PERC H730 Mini) seems frustratingly terse with SMART
>>>> information, but at least one disk has a “Non-medium error count” of
>>>> over 20,000..
>>>>>
>>>>> I’ll try disabling offloads as well.
>>>>>
>>>>> Thanks much for the suggestions!
>>>>>
>>>>> Cheers,
>>>>> Lincoln
>>>>>
>>>>>> On Sep 9, 2015, at 3:59 AM, Jan Schermer <[email protected]> wrote:
>>>>>>
>>>>>> Just to recapitulate - the nodes are doing "nothing" when it drops to
>> zero?
>>>> Not flushing something to drives (iostat)? Not cleaning pagecache
>>>> (kswapd and similiar)? Not out of any type of memory (slab,
>>>> min_free_kbytes)? Not network link errors, no bad checksums (those are
>> hard to spot, though)?
>>>>>>
>>>>>> Unless you find something I suggest you try disabling offloads on
>>>>>> the NICs
>>>> and see if the problem goes away.
>>>>>>
>>>>>> Jan
>>>>>>
>>>>>>> On 08 Sep 2015, at 18:26, Lincoln Bryant <[email protected]>
>> 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.
>>>>>>>
>>>>>>> —Lincoln
>>>>>>>
>>>>>>>
>>>>>>>> On Sep 7, 2015, at 3:35 PM, Vickey Singh
>>>> <[email protected]> wrote:
>>>>>>>>
>>>>>>>> Adding ceph-users.
>>>>>>>>
>>>>>>>> On Mon, Sep 7, 2015 at 11:31 PM, Vickey Singh
>>>> <[email protected]> wrote:
>>>>>>>>
>>>>>>>>
>>>>>>>> On Mon, Sep 7, 2015 at 10:04 PM, Udo Lembke
>>>> <[email protected]> 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,stor0
>>>>>>>>> 11
>>>>>>>>> 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 ]#
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> _______________________________________________
>>>>>>>>> ceph-users mailing list
>>>>>>>>>
>>>>>>>>> [email protected]
>>>>>>>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> ceph-users mailing list
>>>>>>>> [email protected]
>>>>>>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> ceph-users mailing list
>>>>>>> [email protected]
>>>>>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> ceph-users mailing list
>>>>> [email protected]
>>>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>>>>
>>>> _______________________________________________
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>>
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