Hello,
We still facing same memory leak issue even if we specify
bluestore_cache_size to 100M which caused ceph OSD process killed by out of
memory .
Mar 27 01:57:05 cn1 kernel: ceph-osd invoked oom-killer: gfp_mask=0x280da,
order=0, oom_score_adj=0
Mar 27 01:57:05 cn1 kernel: ceph-osd cpuset=/ mems_allowed=0-1
Mar 27 01:57:05 cn1 kernel: CPU: 0 PID: 422861 Comm: ceph-osd Not tainted
3.10.0-327.el7.x86_64 #1
Mar 27 01:57:05 cn1 kernel: Hardware name: HP ProLiant XL450 Gen9
Server/ProLiant XL450 Gen9 Server, BIOS U21 09/12/2016
Mar 27 01:57:05 cn1 kernel: ffff884546751700 00000000275e2e50
ffff88454137b6f0 ffffffff816351f1
Mar 27 01:57:05 cn1 kernel: ffff88454137b780 ffffffff81630191
000000000487ffff ffff8846f0665590
Mar 27 01:57:05 cn1 kernel: ffff8845411b3ad8 ffff88454137b7d0
ffffffffffffffd5 0000000000000001
Mar 27 01:57:05 cn1 kernel: Call Trace:
Mar 27 01:57:05 cn1 kernel: [<ffffffff816351f1>] dump_stack+0x19/0x1b
Mar 27 01:57:05 cn1 kernel: [<ffffffff81630191>] dump_header+0x8e/0x214
Mar 27 01:57:05 cn1 kernel: [<ffffffff8116cdee>]
oom_kill_process+0x24e/0x3b0
Mar 27 01:57:05 cn1 kernel: [<ffffffff8116c956>] ?
find_lock_task_mm+0x56/0xc0
Mar 27 01:57:05 cn1 kernel: [<ffffffff8116d616>] out_of_memory+0x4b6/0x4f0
Mar 27 01:57:05 cn1 kernel: [<ffffffff811737f5>]
__alloc_pages_nodemask+0xa95/0xb90
Mar 27 01:57:05 cn1 kernel: [<ffffffff811b78ca>] alloc_pages_vma+0x9a/0x140
Mar 27 01:57:05 cn1 kernel: [<ffffffff81197655>] handle_mm_fault+0xb85/0xf50
Mar 27 01:57:05 cn1 kernel: [<ffffffffa04f5b22>] ?
xfs_perag_get_tag+0x42/0xe0 [xfs]
Mar 27 01:57:05 cn1 kernel: [<ffffffff81640e22>] __do_page_fault+0x152/0x420
Mar 27 01:57:05 cn1 kernel: [<ffffffff81641113>] do_page_fault+0x23/0x80
Mar 27 01:57:05 cn1 kernel: [<ffffffff8163d408>] page_fault+0x28/0x30
Mar 27 01:57:05 cn1 kernel: [<ffffffff813000c9>] ?
copy_user_enhanced_fast_string+0x9/0x20
Mar 27 01:57:05 cn1 kernel: [<ffffffff8130600a>] ? memcpy_toiovec+0x4a/0x90
Mar 27 01:57:05 cn1 kernel: [<ffffffff8151f91f>]
skb_copy_datagram_iovec+0x12f/0x2a0
Mar 27 01:57:05 cn1 kernel: [<ffffffff81574418>] tcp_recvmsg+0x248/0xbc0
Mar 27 01:57:05 cn1 kernel: [<ffffffff810bb685>] ? sched_clock_cpu+0x85/0xc0
Mar 27 01:57:05 cn1 kernel: [<ffffffff815a10eb>] inet_recvmsg+0x7b/0xa0
Mar 27 01:57:05 cn1 kernel: [<ffffffff8150ffb6>]
sock_aio_read.part.7+0x146/0x160
Mar 27 01:57:05 cn1 kernel: [<ffffffff8150fff1>] sock_aio_read+0x21/0x30
Mar 27 01:57:05 cn1 kernel: [<ffffffff811ddcdd>] do_sync_read+0x8d/0xd0
Mar 27 01:57:05 cn1 kernel: [<ffffffff811de4e5>] vfs_read+0x145/0x170
Mar 27 01:57:05 cn1 kernel: [<ffffffff811def8f>] SyS_read+0x7f/0xe0
Mar 27 01:57:05 cn1 kernel: [<ffffffff81645909>]
system_call_fastpath+0x16/0x1b
For several occurance of OOM event
#dmesg -T | grep -i memory
[Mon Mar 27 02:51:25 2017] Out of memory: Kill process 459076 (ceph-osd)
score 18 or sacrifice child
[Mon Mar 27 06:41:16 2017] [<ffffffff8116d616>] out_of_memory+0x4b6/0x4f0
[Mon Mar 27 06:41:16 2017] Out of memory: Kill process 976901 (java) score
31 or sacrifice child
[Mon Mar 27 06:43:55 2017] [<ffffffff8116d616>] out_of_memory+0x4b6/0x4f0
[Mon Mar 27 06:43:55 2017] Out of memory: Kill process 37351 (java) score
31 or sacrifice child
[Mon Mar 27 06:43:55 2017] [<ffffffff8116d616>] out_of_memory+0x4b6/0x4f0
[Mon Mar 27 06:43:55 2017] Out of memory: Kill process 435981 (ceph-osd)
score 17 or sacrifice child
[Mon Mar 27 11:06:07 2017] [<ffffffff8116d616>] out_of_memory+0x4b6/0x4f0
# numactl -H
available: 2 nodes (0-1)
node 0 cpus: 0 1 2 3 4 5 6 7 16 17 18 19 20 21 22 23
node 0 size: 294786 MB
node 0 free: 3447 MB ===>>> Used almost 98%
While analysing numastat results, here you can find each osd consumes more
than 5G.
====
# numastat -s ceph
Per-node process memory usage (in MBs)
PID Node 0 Node 1 Total
----------------- --------------- --------------- ---------------
372602 (ceph-osd) 5418.34 2.84 5421.18
491602 (ceph-osd) 5351.95 2.83 5354.78
417717 (ceph-osd) 5175.98 2.83 5178.81
273980 (ceph-osd) 5167.83 2.82 5170.65
311956 (ceph-osd) 5167.04 2.84 5169.88
440537 (ceph-osd) 5161.57 2.84 5164.41
368422 (ceph-osd) 5157.87 2.83 5160.70
292227 (ceph-osd) 5156.42 2.83 5159.25
====
Is there any way to fix the memory leak? Awaiting for your comments.
---
bluestore_cache_size = 107374182
bluefs_buffered_io = true
---
Env:- RHEL7.2
v11.2.0 kraken , EC 4+1
FYI - http://tracker.ceph.com/issues/18924 Raised already a tracker for
this issue.
Thanks
On Mon, Feb 20, 2017 at 11:18 AM, Jay Linux <jaylinuxg...@gmail.com> wrote:
> Hello Shinobu,
>
> We already raised ticket for this issue. FYI - http://tracker.ceph.com/
> issues/18924
>
> Thanks
> Jayaram
>
>
> On Mon, Feb 20, 2017 at 12:36 AM, Shinobu Kinjo <ski...@redhat.com> wrote:
>
>> Please open ticket at http://tracker.ceph.com, if you haven't yet.
>>
>> On Thu, Feb 16, 2017 at 6:07 PM, Muthusamy Muthiah
>> <muthiah.muthus...@gmail.com> wrote:
>> > Hi Wido,
>> >
>> > Thanks for the information and let us know if this is a bug.
>> > As workaround we will go with small bluestore_cache_size to 100MB.
>> >
>> > Thanks,
>> > Muthu
>> >
>> > On 16 February 2017 at 14:04, Wido den Hollander <w...@42on.com> wrote:
>> >>
>> >>
>> >> > Op 16 februari 2017 om 7:19 schreef Muthusamy Muthiah
>> >> > <muthiah.muthus...@gmail.com>:
>> >> >
>> >> >
>> >> > Thanks IIya Letkowski for the information we will change this value
>> >> > accordingly.
>> >> >
>> >>
>> >> What I understand from yesterday's performance meeting is that this
>> seems
>> >> like a bug. Lowering this buffer reduces memory, but the root-cause
>> seems to
>> >> be memory not being freed. A few bytes of a larger allocation still
>> >> allocated causing this buffer not to be freed.
>> >>
>> >> Tried:
>> >>
>> >> debug_mempools = true
>> >>
>> >> $ ceph daemon osd.X dump_mempools
>> >>
>> >> Might want to view the YouTube video of yesterday when it's online:
>> >> https://www.youtube.com/channel/UCno-Fry25FJ7B4RycCxOtfw/videos
>> >>
>> >> Wido
>> >>
>> >> > Thanks,
>> >> > Muthu
>> >> >
>> >> > On 15 February 2017 at 17:03, Ilya Letkowski <
>> mj12.svetz...@gmail.com>
>> >> > wrote:
>> >> >
>> >> > > Hi, Muthusamy Muthiah
>> >> > >
>> >> > > I'm not totally sure that this is a memory leak.
>> >> > > We had same problems with bluestore on ceph v11.2.0.
>> >> > > Reduce bluestore cache helped us to solve it and stabilize OSD
>> memory
>> >> > > consumption on the 3GB level.
>> >> > >
>> >> > > Perhaps this will help you:
>> >> > >
>> >> > > bluestore_cache_size = 104857600
>> >> > >
>> >> > >
>> >> > >
>> >> > > On Tue, Feb 14, 2017 at 11:52 AM, Muthusamy Muthiah <
>> >> > > muthiah.muthus...@gmail.com> wrote:
>> >> > >
>> >> > >> Hi All,
>> >> > >>
>> >> > >> On all our 5 node cluster with ceph 11.2.0 we encounter memory
>> leak
>> >> > >> issues.
>> >> > >>
>> >> > >> Cluster details : 5 node with 24/68 disk per node , EC : 4+1 ,
>> RHEL
>> >> > >> 7.2
>> >> > >>
>> >> > >> Some traces using sar are below and attached the memory
>> utilisation
>> >> > >> graph
>> >> > >> .
>> >> > >>
>> >> > >> (16:54:42)[cn2.c1 sa] # sar -r
>> >> > >> 07:50:01 kbmemfree kbmemused %memused kbbuffers kbcached kbcommit
>> >> > >> %commit
>> >> > >> kbactive kbinact kbdirty
>> >> > >> 10:20:01 32077264 132754368 80.54 16176 3040244 77767024 47.18
>> >> > >> 51991692
>> >> > >> 2676468 260
>> >> > >>
>> >> > >>
>> >> > >>
>> >> > >>
>> >> > >>
>> >> > >>
>> >> > >>
>> >> > >>
>> >> > >> *10:30:01 32208384 132623248 80.46 16176 3048536 77832312 47.22
>> >> > >> 51851512
>> >> > >> 2684552 1210:40:01 32067244 132764388 80.55 16176 3059076 77832316
>> >> > >> 47.22
>> >> > >> 51983332 2694708 26410:50:01 30626144 134205488 81.42 16176
>> 3064340
>> >> > >> 78177232 47.43 53414144 2693712 411:00:01 28927656 135903976 82.45
>> >> > >> 16176
>> >> > >> 3074064 78958568 47.90 55114284 2702892 1211:10:01 27158548
>> 137673084
>> >> > >> 83.52
>> >> > >> 16176 3080600 80553936 48.87 56873664 2708904 1211:20:01 26455556
>> >> > >> 138376076
>> >> > >> 83.95 16176 3080436 81991036 49.74 57570280 2708500 811:30:01
>> >> > >> 26002252
>> >> > >> 138829380 84.22 16176 3090556 82223840 49.88 58015048 2718036
>> >> > >> 1611:40:01
>> >> > >> 25965924 138865708 84.25 16176 3089708 83734584 50.80 58049980
>> >> > >> 2716740
>> >> > >> 1211:50:01 26142888 138688744 84.14 16176 3089544 83800100 50.84
>> >> > >> 57869628
>> >> > >> 2715400 16*
>> >> > >>
>> >> > >> ...
>> >> > >> ...
>> >> > >>
>> >> > >> In the attached graph, there is increase in memory utilisation by
>> >> > >> ceph-osd during soak test. And when it reaches the system limit of
>> >> > >> 128GB
>> >> > >> RAM , we could able to see the below dmesg logs related to memory
>> out
>> >> > >> when
>> >> > >> the system reaches close to 128GB RAM. OSD.3 killed due to Out of
>> >> > >> memory
>> >> > >> and started again.
>> >> > >>
>> >> > >> [Tue Feb 14 03:51:02 2017] *tp_osd_tp invoked oom-killer:
>> >> > >> gfp_mask=0x280da, order=0, oom_score_adj=0*
>> >> > >> [Tue Feb 14 03:51:02 2017] tp_osd_tp cpuset=/ mems_allowed=0-1
>> >> > >> [Tue Feb 14 03:51:02 2017] CPU: 20 PID: 11864 Comm: tp_osd_tp Not
>> >> > >> tainted
>> >> > >> 3.10.0-327.13.1.el7.x86_64 #1
>> >> > >> [Tue Feb 14 03:51:02 2017] Hardware name: HP ProLiant XL420
>> >> > >> Gen9/ProLiant
>> >> > >> XL420 Gen9, BIOS U19 09/12/2016
>> >> > >> [Tue Feb 14 03:51:02 2017] ffff8819ccd7a280 0000000030e84036
>> >> > >> ffff881fa58f7528 ffffffff816356f4
>> >> > >> [Tue Feb 14 03:51:02 2017] ffff881fa58f75b8 ffffffff8163068f
>> >> > >> ffff881fa3478360 ffff881fa3478378
>> >> > >> [Tue Feb 14 03:51:02 2017] ffff881fa58f75e8 ffff8819ccd7a280
>> >> > >> 0000000000000001 000000000001f65f
>> >> > >> [Tue Feb 14 03:51:02 2017] Call Trace:
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff816356f4>]
>> dump_stack+0x19/0x1b
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff8163068f>]
>> >> > >> dump_header+0x8e/0x214
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff8116ce7e>]
>> >> > >> oom_kill_process+0x24e/0x3b0
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff8116c9e6>] ?
>> >> > >> find_lock_task_mm+0x56/0xc0
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff8116d6a6>]
>> >> > >> *out_of_memory+0x4b6/0x4f0*
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff81173885>]
>> >> > >> __alloc_pages_nodemask+0xa95/0xb90
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff811b792a>]
>> >> > >> alloc_pages_vma+0x9a/0x140
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff811976c5>]
>> >> > >> handle_mm_fault+0xb85/0xf50
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff811957fb>] ?
>> >> > >> follow_page_mask+0xbb/0x5c0
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff81197c2b>]
>> >> > >> __get_user_pages+0x19b/0x640
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff8119843d>]
>> >> > >> get_user_pages_unlocked+0x15d/0x1f0
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff8106544f>]
>> >> > >> get_user_pages_fast+0x9f/0x1a0
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff8121de78>]
>> >> > >> do_blockdev_direct_IO+0x1a78/0x2610
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff81218c40>] ?
>> I_BDEV+0x10/0x10
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff8121ea65>]
>> >> > >> __blockdev_direct_IO+0x55/0x60
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff81218c40>] ?
>> I_BDEV+0x10/0x10
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff81219297>]
>> >> > >> blkdev_direct_IO+0x57/0x60
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff81218c40>] ?
>> I_BDEV+0x10/0x10
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff8116af63>]
>> >> > >> generic_file_aio_read+0x6d3/0x750
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffffa038ad5c>] ?
>> >> > >> xfs_iunlock+0x11c/0x130 [xfs]
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff811690db>] ?
>> >> > >> unlock_page+0x2b/0x30
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff81192f21>] ?
>> >> > >> __do_fault+0x401/0x510
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff8121970c>]
>> >> > >> blkdev_aio_read+0x4c/0x70
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff811ddcfd>]
>> >> > >> do_sync_read+0x8d/0xd0
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff811de45c>]
>> vfs_read+0x9c/0x170
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff811df182>]
>> >> > >> SyS_pread64+0x92/0xc0
>> >> > >> [Tue Feb 14 03:51:02 2017] [<ffffffff81645e89>]
>> >> > >> system_call_fastpath+0x16/0x1b
>> >> > >>
>> >> > >>
>> >> > >> Feb 14 03:51:40 fr-paris kernel: *Out of memory: Kill process 7657
>> >> > >> (ceph-osd) score 45 or sacrifice child*
>> >> > >> Feb 14 03:51:40 fr-paris kernel: Killed process 7657 (ceph-osd)
>> >> > >> total-vm:8650208kB, anon-rss:6124660kB, file-rss:1560kB
>> >> > >> Feb 14 03:51:41 fr-paris systemd:* ceph-osd@3.service: main
>> process
>> >> > >> exited, code=killed, status=9/KILL*
>> >> > >> Feb 14 03:51:41 fr-paris systemd: Unit ceph-osd@3.service entered
>> >> > >> failed
>> >> > >> state.
>> >> > >> Feb 14 03:51:41 fr-paris systemd: *ceph-osd@3.service failed.*
>> >> > >> Feb 14 03:51:41 fr-paris systemd: cassandra.service: main process
>> >> > >> exited,
>> >> > >> code=killed, status=9/KILL
>> >> > >> Feb 14 03:51:41 fr-paris systemd: Unit cassandra.service entered
>> >> > >> failed
>> >> > >> state.
>> >> > >> Feb 14 03:51:41 fr-paris systemd: cassandra.service failed.
>> >> > >> Feb 14 03:51:41 fr-paris ceph-mgr: 2017-02-14 03:51:41.978878
>> >> > >> 7f51a3154700 -1 mgr ms_dispatch osd_map(7517..7517 src has
>> >> > >> 6951..7517) v3
>> >> > >> Feb 14 03:51:42 fr-paris systemd: Device
>> >> > >> dev-disk-by\x2dpartlabel-ceph\x5cx20block.device
>> >> > >> appeared twice with different sysfs paths
>> >> > >> /sys/devices/pci0000:00/0000:0
>> >> > >> 0:03.2/0000:03:00.0/host0/target0:0:0/0:0:0:9/block/sdj/sdj2 and
>> >> > >> /sys/devices/pci0000:00/0000:00:03.2/0000:03:00.0/host0/targ
>> >> > >> et0:0:0/0:0:0:4/block/sde/sde2
>> >> > >> Feb 14 03:51:42 fr-paris ceph-mgr: 2017-02-14 03:51:42.992477
>> >> > >> 7f51a3154700 -1 mgr ms_dispatch osd_map(7518..7518 src has
>> >> > >> 6951..7518) v3
>> >> > >> Feb 14 03:51:43 fr-paris ceph-mgr: 2017-02-14 03:51:43.508990
>> >> > >> 7f51a3154700 -1 mgr ms_dispatch mgrdigest v1
>> >> > >> Feb 14 03:51:48 fr-paris ceph-mgr: 2017-02-14 03:51:48.508970
>> >> > >> 7f51a3154700 -1 mgr ms_dispatch mgrdigest v1
>> >> > >> Feb 14 03:51:53 fr-paris ceph-mgr: 2017-02-14 03:51:53.509592
>> >> > >> 7f51a3154700 -1 mgr ms_dispatch mgrdigest v1
>> >> > >> Feb 14 03:51:58 fr-paris ceph-mgr: 2017-02-14 03:51:58.509936
>> >> > >> 7f51a3154700 -1 mgr ms_dispatch mgrdigest v1
>> >> > >> Feb 14 03:52:01 fr-paris systemd: ceph-osd@3.service holdoff time
>> >> > >> over,
>> >> > >> scheduling restart.
>> >> > >> Feb 14 03:52:02 fr-paris systemd: *Starting Ceph object storage
>> >> > >> daemon
>> >> > >> osd.3.*..
>> >> > >> Feb 14 03:52:02 fr-paris systemd: Started Ceph object storage
>> daemon
>> >> > >> osd.3.
>> >> > >> Feb 14 03:52:02 fr-paris numactl: 2017-02-14 03:52:02.307106
>> >> > >> 7f1e499bb940
>> >> > >> -1 WARNING: the following dangerous and experimental features are
>> >> > >> enabled:
>> >> > >> bluestore,rocksdb
>> >> > >> Feb 14 03:52:02 fr-paris numactl: 2017-02-14 03:52:02.317687
>> >> > >> 7f1e499bb940
>> >> > >> -1 WARNING: the following dangerous and experimental features are
>> >> > >> enabled:
>> >> > >> bluestore,rocksdb
>> >> > >> Feb 14 03:52:02 fr-paris numactl: starting osd.3 at - osd_data
>> >> > >> /var/lib/ceph/osd/ceph-3 /var/lib/ceph/osd/ceph-3/journal
>> >> > >> Feb 14 03:52:02 fr-paris numactl: 2017-02-14 03:52:02.333522
>> >> > >> 7f1e499bb940
>> >> > >> -1 WARNING: experimental feature 'bluestore' is enabled
>> >> > >> Feb 14 03:52:02 fr-paris numactl: Please be aware that this
>> feature
>> >> > >> is
>> >> > >> experimental, untested,
>> >> > >> Feb 14 03:52:02 fr-paris numactl: unsupported, and may result in
>> data
>> >> > >> corruption, data loss,
>> >> > >> Feb 14 03:52:02 fr-paris numactl: and/or irreparable damage to
>> your
>> >> > >> cluster. Do not use
>> >> > >> Feb 14 03:52:02 fr-paris numactl: feature with important data.
>> >> > >>
>> >> > >> This seems to happen only in 11.2.0 and not in 11.1.x . Could you
>> >> > >> please
>> >> > >> help us in resolving this issue by means of any config change to
>> >> > >> limit the
>> >> > >> memory use on ceph-osd or a bug in the current kraken release.
>> >> > >>
>> >> > >> Thanks,
>> >> > >> Muthu
>> >> > >>
>> >> > >> _______________________________________________
>> >> > >> ceph-users mailing list
>> >> > >> ceph-users@lists.ceph.com
>> >> > >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>> >> > >>
>> >> > >>
>> >> > >
>> >> > >
>> >> > > --
>> >> > > С уважением / Best regards
>> >> > >
>> >> > > Илья Летковский / Ilya Letkouski
>> >> > >
>> >> > > Phone, Viber: +375 29 3237335
>> >> > >
>> >> > > Minsk, Belarus (GMT+3)
>> >> > >
>> >> > _______________________________________________
>> >> > ceph-users mailing list
>> >> > ceph-users@lists.ceph.com
>> >> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>> >
>> >
>> >
>> > _______________________________________________
>> > ceph-users mailing list
>> > ceph-users@lists.ceph.com
>> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>> >
>> _______________________________________________
>> ceph-users mailing list
>> ceph-users@lists.ceph.com
>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>>
>
>
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