Hi ,
I have bundled the public NICs and added 2 more monitors ( running on 2 of
the 3 OSD hosts)
This seem to improve things but still I have high latency
Also performance of the SSD pool is worse than HDD which is very confusing
SSDpool is using one Toshiba PX05SMB040Y per server ( for a total of 3
OSDs)
while HDD pool is using 2 Seagate ST600MM0006 disks per server () for a
total of 6 OSDs)
Note
I have also disabled C state in the BIOS and added "intel_pstate=disable
intel_idle.max_cstate=0 processor.max_cstate=0 idle=poll" to GRUB
Any hints/suggestions will be greatly appreciated
[root@osd04 ~]# ceph status
cluster:
id: 37161a51-a159-4895-a7fd-3b0d857f1b66
health: HEALTH_WARN
noscrub,nodeep-scrub flag(s) set
application not enabled on 2 pool(s)
mon osd02 is low on available space
services:
mon: 3 daemons, quorum osd01,osd02,mon01
mgr: mon01(active)
osd: 9 osds: 9 up, 9 in
flags noscrub,nodeep-scrub
tcmu-runner: 6 daemons active
data:
pools: 2 pools, 228 pgs
objects: 50384 objects, 196 GB
usage: 402 GB used, 3504 GB / 3906 GB avail
pgs: 228 active+clean
io:
client: 46061 kB/s rd, 852 B/s wr, 15 op/s rd, 0 op/s wr
[root@osd04 ~]# ceph osd tree
ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF
-9 4.50000 root ssds
-10 1.50000 host osd01-ssd
6 hdd 1.50000 osd.6 up 1.00000 1.00000
-11 1.50000 host osd02-ssd
7 hdd 1.50000 osd.7 up 1.00000 1.00000
-12 1.50000 host osd04-ssd
8 hdd 1.50000 osd.8 up 1.00000 1.00000
-1 2.72574 root default
-3 1.09058 host osd01
0 hdd 0.54529 osd.0 up 1.00000 1.00000
4 hdd 0.54529 osd.4 up 1.00000 1.00000
-5 1.09058 host osd02
1 hdd 0.54529 osd.1 up 1.00000 1.00000
3 hdd 0.54529 osd.3 up 1.00000 1.00000
-7 0.54459 host osd04
2 hdd 0.27229 osd.2 up 1.00000 1.00000
5 hdd 0.27229 osd.5 up 1.00000 1.00000
rados bench -p ssdpool 300 -t 32 write --no-cleanup && rados bench -p
ssdpool 300 -t 32 seq
Total time run: 302.058832
Total writes made: 4100
Write size: 4194304
Object size: 4194304
Bandwidth (MB/sec): 54.2941
Stddev Bandwidth: 70.3355
Max bandwidth (MB/sec): 252
Min bandwidth (MB/sec): 0
Average IOPS: 13
Stddev IOPS: 17
Max IOPS: 63
Min IOPS: 0
Average Latency(s): 2.35655
Stddev Latency(s): 4.4346
Max latency(s): 29.7027
Min latency(s): 0.045166
rados bench -p rbd 300 -t 32 write --no-cleanup && rados bench -p rbd 300
-t 32 seq
Total time run: 301.428571
Total writes made: 8753
Write size: 4194304
Object size: 4194304
Bandwidth (MB/sec): 116.154
Stddev Bandwidth: 71.5763
Max bandwidth (MB/sec): 320
Min bandwidth (MB/sec): 0
Average IOPS: 29
Stddev IOPS: 17
Max IOPS: 80
Min IOPS: 0
Average Latency(s): 1.10189
Stddev Latency(s): 1.80203
Max latency(s): 15.0715
Min latency(s): 0.0210309
[root@osd04 ~]# ethtool -k gth0
Features for gth0:
rx-checksumming: on
tx-checksumming: on
tx-checksum-ipv4: off [fixed]
tx-checksum-ip-generic: on
tx-checksum-ipv6: off [fixed]
tx-checksum-fcoe-crc: on [fixed]
tx-checksum-sctp: on
scatter-gather: on
tx-scatter-gather: on
tx-scatter-gather-fraglist: off [fixed]
tcp-segmentation-offload: on
tx-tcp-segmentation: on
tx-tcp-ecn-segmentation: off [fixed]
tx-tcp-mangleid-segmentation: off
tx-tcp6-segmentation: on
udp-fragmentation-offload: off [fixed]
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off
rx-vlan-offload: on
tx-vlan-offload: on
ntuple-filters: off
receive-hashing: on
highdma: on [fixed]
rx-vlan-filter: on
vlan-challenged: off [fixed]
tx-lockless: off [fixed]
netns-local: off [fixed]
tx-gso-robust: off [fixed]
tx-fcoe-segmentation: on [fixed]
tx-gre-segmentation: on
tx-gre-csum-segmentation: on
tx-ipxip4-segmentation: on
tx-ipxip6-segmentation: on
tx-udp_tnl-segmentation: on
tx-udp_tnl-csum-segmentation: on
tx-gso-partial: on
tx-sctp-segmentation: off [fixed]
tx-esp-segmentation: off [fixed]
fcoe-mtu: off [fixed]
tx-nocache-copy: off
loopback: off [fixed]
rx-fcs: off [fixed]
rx-all: off
tx-vlan-stag-hw-insert: off [fixed]
rx-vlan-stag-hw-parse: off [fixed]
rx-vlan-stag-filter: off [fixed]
l2-fwd-offload: off
hw-tc-offload: off
esp-hw-offload: off [fixed]
esp-tx-csum-hw-offload: off [fixed]
On 22 January 2018 at 12:09, Steven Vacaroaia <[email protected]> wrote:
> Hi David,
>
> I noticed the public interface of the server I am running the test from is
> heavily used so I will bond that one too
>
> I doubt though that this explains the poor performance
>
> Thanks for your advice
>
> Steven
>
>
>
> On 22 January 2018 at 12:02, David Turner <[email protected]> wrote:
>
>> I'm not speaking to anything other than your configuration.
>>
>> "I am using 2 x 10 GB bonded ( BONDING_OPTS="mode=4 miimon=100
>> xmit_hash_policy=1 lacp_rate=1") for cluster and 1 x 1GB for public"
>> It might not be a bad idea for you to forgo the public network on the 1Gb
>> interfaces and either put everything on one network or use VLANs on the
>> 10Gb connections. I lean more towards that in particular because your
>> public network doesn't have a bond on it. Just as a note, communication
>> between the OSDs and the MONs are all done on the public network. If that
>> interface goes down, then the OSDs are likely to be marked down/out from
>> your cluster. I'm a fan of VLANs, but if you don't have the equipment or
>> expertise to go that route, then just using the same subnet for public and
>> private is a decent way to go.
>>
>> On Mon, Jan 22, 2018 at 11:37 AM Steven Vacaroaia <[email protected]>
>> wrote:
>>
>>> I did test with rados bench ..here are the results
>>>
>>> rados bench -p ssdpool 300 -t 12 write --no-cleanup && rados bench -p
>>> ssdpool 300 -t 12 seq
>>>
>>> Total time run: 300.322608
>>> Total writes made: 10632
>>> Write size: 4194304
>>> Object size: 4194304
>>> Bandwidth (MB/sec): 141.608
>>> Stddev Bandwidth: 74.1065
>>> Max bandwidth (MB/sec): 264
>>> Min bandwidth (MB/sec): 0
>>> Average IOPS: 35
>>> Stddev IOPS: 18
>>> Max IOPS: 66
>>> Min IOPS: 0
>>> Average Latency(s): 0.33887
>>> Stddev Latency(s): 0.701947
>>> Max latency(s): 9.80161
>>> Min latency(s): 0.015171
>>>
>>> Total time run: 300.829945
>>> Total reads made: 10070
>>> Read size: 4194304
>>> Object size: 4194304
>>> Bandwidth (MB/sec): 133.896
>>> Average IOPS: 33
>>> Stddev IOPS: 14
>>> Max IOPS: 68
>>> Min IOPS: 3
>>> Average Latency(s): 0.35791
>>> Max latency(s): 4.68213
>>> Min latency(s): 0.0107572
>>>
>>>
>>> rados bench -p scbench256 300 -t 12 write --no-cleanup && rados bench -p
>>> scbench256 300 -t 12 seq
>>>
>>> Total time run: 300.747004
>>> Total writes made: 10239
>>> Write size: 4194304
>>> Object size: 4194304
>>> Bandwidth (MB/sec): 136.181
>>> Stddev Bandwidth: 75.5
>>> Max bandwidth (MB/sec): 272
>>> Min bandwidth (MB/sec): 0
>>> Average IOPS: 34
>>> Stddev IOPS: 18
>>> Max IOPS: 68
>>> Min IOPS: 0
>>> Average Latency(s): 0.352339
>>> Stddev Latency(s): 0.72211
>>> Max latency(s): 9.62304
>>> Min latency(s): 0.00936316
>>> hints = 1
>>>
>>>
>>> Total time run: 300.610761
>>> Total reads made: 7628
>>> Read size: 4194304
>>> Object size: 4194304
>>> Bandwidth (MB/sec): 101.5
>>> Average IOPS: 25
>>> Stddev IOPS: 11
>>> Max IOPS: 61
>>> Min IOPS: 0
>>> Average Latency(s): 0.472321
>>> Max latency(s): 15.636
>>> Min latency(s): 0.0188098
>>>
>>>
>>> On 22 January 2018 at 11:34, Steven Vacaroaia <[email protected]> wrote:
>>>
>>>> sorry ..send the message too soon
>>>> Here is more info
>>>> Vendor Id : SEAGATE
>>>> Product Id : ST600MM0006
>>>> State : Online
>>>> Disk Type : SAS,Hard Disk Device
>>>> Capacity : 558.375 GB
>>>> Power State : Active
>>>>
>>>> ( SSD is in slot 0)
>>>>
>>>> megacli -LDGetProp -Cache -LALL -a0
>>>>
>>>> Adapter 0-VD 0(target id: 0): Cache Policy:WriteThrough, ReadAheadNone,
>>>> Direct, No Write Cache if bad BBU
>>>> Adapter 0-VD 1(target id: 1): Cache Policy:WriteBack, ReadAdaptive,
>>>> Direct, No Write Cache if bad BBU
>>>> Adapter 0-VD 2(target id: 2): Cache Policy:WriteBack, ReadAdaptive,
>>>> Direct, No Write Cache if bad BBU
>>>> Adapter 0-VD 3(target id: 3): Cache Policy:WriteBack, ReadAdaptive,
>>>> Direct, No Write Cache if bad BBU
>>>> Adapter 0-VD 4(target id: 4): Cache Policy:WriteBack, ReadAdaptive,
>>>> Direct, No Write Cache if bad BBU
>>>> Adapter 0-VD 5(target id: 5): Cache Policy:WriteBack, ReadAdaptive,
>>>> Direct, No Write Cache if bad BBU
>>>>
>>>> [root@osd01 ~]# megacli -LDGetProp -DskCache -LALL -a0
>>>>
>>>> Adapter 0-VD 0(target id: 0): Disk Write Cache : Disabled
>>>> Adapter 0-VD 1(target id: 1): Disk Write Cache : Disk's Default
>>>> Adapter 0-VD 2(target id: 2): Disk Write Cache : Disk's Default
>>>> Adapter 0-VD 3(target id: 3): Disk Write Cache : Disk's Default
>>>> Adapter 0-VD 4(target id: 4): Disk Write Cache : Disk's Default
>>>> Adapter 0-VD 5(target id: 5): Disk Write Cache : Disk's Default
>>>>
>>>>
>>>> CPU
>>>> Intel(R) Xeon(R) CPU E5-2640 0 @ 2.50GHz
>>>>
>>>> Centos 7 kernel 3.10.0-693.11.6.el7.x86_64
>>>>
>>>> sysctl -p
>>>> net.ipv4.tcp_sack = 0
>>>> net.core.netdev_budget = 600
>>>> net.ipv4.tcp_window_scaling = 1
>>>> net.core.rmem_max = 16777216
>>>> net.core.wmem_max = 16777216
>>>> net.core.rmem_default = 16777216
>>>> net.core.wmem_default = 16777216
>>>> net.core.optmem_max = 40960
>>>> net.ipv4.tcp_rmem = 4096 87380 16777216
>>>> net.ipv4.tcp_wmem = 4096 65536 16777216
>>>> net.ipv4.tcp_syncookies = 0
>>>> net.core.somaxconn = 1024
>>>> net.core.netdev_max_backlog = 20000
>>>> net.ipv4.tcp_max_syn_backlog = 30000
>>>> net.ipv4.tcp_max_tw_buckets = 2000000
>>>> net.ipv4.tcp_tw_reuse = 1
>>>> net.ipv4.tcp_slow_start_after_idle = 0
>>>> net.ipv4.conf.all.send_redirects = 0
>>>> net.ipv4.conf.all.accept_redirects = 0
>>>> net.ipv4.conf.all.accept_source_route = 0
>>>> vm.min_free_kbytes = 262144
>>>> vm.swappiness = 0
>>>> vm.vfs_cache_pressure = 100
>>>> fs.suid_dumpable = 0
>>>> kernel.core_uses_pid = 1
>>>> kernel.msgmax = 65536
>>>> kernel.msgmnb = 65536
>>>> kernel.randomize_va_space = 1
>>>> kernel.sysrq = 0
>>>> kernel.pid_max = 4194304
>>>> fs.file-max = 100000
>>>>
>>>>
>>>> ceph.conf
>>>>
>>>>
>>>> public_network = 10.10.30.0/24
>>>> cluster_network = 192.168.0.0/24
>>>>
>>>>
>>>> osd_op_num_threads_per_shard = 2
>>>> osd_op_num_shards = 25
>>>> osd_pool_default_size = 2
>>>> osd_pool_default_min_size = 1 # Allow writing 1 copy in a degraded state
>>>> osd_pool_default_pg_num = 256
>>>> osd_pool_default_pgp_num = 256
>>>> osd_crush_chooseleaf_type = 1
>>>> osd_scrub_load_threshold = 0.01
>>>> osd_scrub_min_interval = 137438953472
>>>> osd_scrub_max_interval = 137438953472
>>>> osd_deep_scrub_interval = 137438953472
>>>> osd_max_scrubs = 16
>>>> osd_op_threads = 8
>>>> osd_max_backfills = 1
>>>> osd_recovery_max_active = 1
>>>> osd_recovery_op_priority = 1
>>>>
>>>>
>>>>
>>>>
>>>> debug_lockdep = 0/0
>>>> debug_context = 0/0
>>>> debug_crush = 0/0
>>>> debug_buffer = 0/0
>>>> debug_timer = 0/0
>>>> debug_filer = 0/0
>>>> debug_objecter = 0/0
>>>> debug_rados = 0/0
>>>> debug_rbd = 0/0
>>>> debug_journaler = 0/0
>>>> debug_objectcatcher = 0/0
>>>> debug_client = 0/0
>>>> debug_osd = 0/0
>>>> debug_optracker = 0/0
>>>> debug_objclass = 0/0
>>>> debug_filestore = 0/0
>>>> debug_journal = 0/0
>>>> debug_ms = 0/0
>>>> debug_monc = 0/0
>>>> debug_tp = 0/0
>>>> debug_auth = 0/0
>>>> debug_finisher = 0/0
>>>> debug_heartbeatmap = 0/0
>>>> debug_perfcounter = 0/0
>>>> debug_asok = 0/0
>>>> debug_throttle = 0/0
>>>> debug_mon = 0/0
>>>> debug_paxos = 0/0
>>>> debug_rgw = 0/0
>>>>
>>>>
>>>> [mon]
>>>> mon_allow_pool_delete = true
>>>>
>>>> [osd]
>>>> osd_heartbeat_grace = 20
>>>> osd_heartbeat_interval = 5
>>>> bluestore_block_db_size = 16106127360 <(610)%20612-7360>
>>>> bluestore_block_wal_size = 1073741824
>>>>
>>>> [osd.6]
>>>> host = osd01
>>>> osd_journal = /dev/disk/by-parttypeuuid/4fbd
>>>> 7e29-9d25-41b8-afd0-062c0ceff05d.1d58775a-5019-42ea-8149-a126f51a2501
>>>> crush_location = root=ssds host=osd01-ssd
>>>>
>>>> [osd.7]
>>>> host = osd02
>>>> osd_journal = /dev/disk/by-parttypeuuid/4fbd
>>>> 7e29-9d25-41b8-afd0-062c0ceff05d.683dc52d-5d69-4ff0-b5d9-b17056a55681
>>>> crush_location = root=ssds host=osd02-ssd
>>>>
>>>> [osd.8]
>>>> host = osd04
>>>> osd_journal = /dev/disk/by-parttypeuuid/4fbd
>>>> 7e29-9d25-41b8-afd0-062c0ceff05d.bd7c0088-b724-441e-9b88-9457305c541d
>>>> crush_location = root=ssds host=osd04-ssd
>>>>
>>>>
>>>> On 22 January 2018 at 11:29, Steven Vacaroaia <[email protected]> wrote:
>>>>
>>>>> Hi David,
>>>>>
>>>>> Yes, I meant no separate partitions for WAL and DB
>>>>>
>>>>> I am using 2 x 10 GB bonded ( BONDING_OPTS="mode=4 miimon=100
>>>>> xmit_hash_policy=1 lacp_rate=1") for cluster and 1 x 1GB for public
>>>>> Disks are
>>>>> Vendor Id : TOSHIBA
>>>>> Product Id : PX05SMB040Y
>>>>> State : Online
>>>>> Disk Type : SAS,Solid State Device
>>>>> Capacity : 372.0 GB
>>>>>
>>>>>
>>>>> On 22 January 2018 at 11:24, David Turner <[email protected]>
>>>>> wrote:
>>>>>
>>>>>> Disk models, other hardware information including CPU, network
>>>>>> config? You say you're using Luminous, but then say journal on same
>>>>>> device. I'm assuming you mean that you just have the bluestore OSD
>>>>>> configured without a separate WAL or DB partition? Any more specifics
>>>>>> you
>>>>>> can give will be helpful.
>>>>>>
>>>>>> On Mon, Jan 22, 2018 at 11:20 AM Steven Vacaroaia <[email protected]>
>>>>>> wrote:
>>>>>>
>>>>>>> Hi,
>>>>>>>
>>>>>>> I'll appreciate if you can provide some guidance / suggestions
>>>>>>> regarding perfomance issues on a test cluster ( 3 x DELL R620, 1
>>>>>>> Entreprise
>>>>>>> SSD, 3 x 600 GB ,Entreprise HDD, 8 cores, 64 GB RAM)
>>>>>>>
>>>>>>> I created 2 pools ( replication factor 2) one with only SSD and the
>>>>>>> other with only HDD
>>>>>>> ( journal on same disk for both)
>>>>>>>
>>>>>>> The perfomance is quite similar although I was expecting to be at
>>>>>>> least 5 times better
>>>>>>> No issues noticed using atop
>>>>>>>
>>>>>>> What should I check / tune ?
>>>>>>>
>>>>>>> Many thanks
>>>>>>> Steven
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> HDD based pool ( journal on the same disk)
>>>>>>>
>>>>>>> ceph osd pool get scbench256 all
>>>>>>>
>>>>>>> size: 2
>>>>>>> min_size: 1
>>>>>>> crash_replay_interval: 0
>>>>>>> pg_num: 256
>>>>>>> pgp_num: 256
>>>>>>> crush_rule: replicated_rule
>>>>>>> hashpspool: true
>>>>>>> nodelete: false
>>>>>>> nopgchange: false
>>>>>>> nosizechange: false
>>>>>>> write_fadvise_dontneed: false
>>>>>>> noscrub: false
>>>>>>> nodeep-scrub: false
>>>>>>> use_gmt_hitset: 1
>>>>>>> auid: 0
>>>>>>> fast_read: 0
>>>>>>>
>>>>>>>
>>>>>>> rbd bench --io-type write image1 --pool=scbench256
>>>>>>> bench type write io_size 4096 io_threads 16 bytes 1073741824
>>>>>>> pattern sequential
>>>>>>> SEC OPS OPS/SEC BYTES/SEC
>>>>>>> 1 46816 46836.46 191842139.78
>>>>>>> 2 90658 45339.11 185709011.80
>>>>>>> 3 133671 44540.80 182439126.08
>>>>>>> 4 177341 44340.36 181618100.14
>>>>>>> 5 217300 43464.04 178028704.54
>>>>>>> 6 259595 42555.85 174308767.05
>>>>>>> elapsed: 6 ops: 262144 ops/sec: 42694.50 bytes/sec:
>>>>>>> 174876688.23
>>>>>>>
>>>>>>> fio /home/cephuser/write_256.fio
>>>>>>> write-4M: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, ioengine=rbd,
>>>>>>> iodepth=32
>>>>>>> fio-2.2.8
>>>>>>> Starting 1 process
>>>>>>> rbd engine: RBD version: 1.12.0
>>>>>>> Jobs: 1 (f=1): [r(1)] [100.0% done] [66284KB/0KB/0KB /s] [16.6K/0/0
>>>>>>> iops] [eta 00m:00s]
>>>>>>>
>>>>>>>
>>>>>>> fio /home/cephuser/write_256.fio
>>>>>>> write-4M: (g=0): rw=write, bs=4K-4K/4K-4K/4K-4K, ioengine=rbd,
>>>>>>> iodepth=32
>>>>>>> fio-2.2.8
>>>>>>> Starting 1 process
>>>>>>> rbd engine: RBD version: 1.12.0
>>>>>>> Jobs: 1 (f=1): [W(1)] [100.0% done] [0KB/14464KB/0KB /s] [0/3616/0
>>>>>>> iops] [eta 00m:00s]
>>>>>>>
>>>>>>>
>>>>>>> SSD based pool
>>>>>>>
>>>>>>>
>>>>>>> ceph osd pool get ssdpool all
>>>>>>>
>>>>>>> size: 2
>>>>>>> min_size: 1
>>>>>>> crash_replay_interval: 0
>>>>>>> pg_num: 128
>>>>>>> pgp_num: 128
>>>>>>> crush_rule: ssdpool
>>>>>>> hashpspool: true
>>>>>>> nodelete: false
>>>>>>> nopgchange: false
>>>>>>> nosizechange: false
>>>>>>> write_fadvise_dontneed: false
>>>>>>> noscrub: false
>>>>>>> nodeep-scrub: false
>>>>>>> use_gmt_hitset: 1
>>>>>>> auid: 0
>>>>>>> fast_read: 0
>>>>>>>
>>>>>>> rbd -p ssdpool create --size 52100 image2
>>>>>>>
>>>>>>> rbd bench --io-type write image2 --pool=ssdpool
>>>>>>> bench type write io_size 4096 io_threads 16 bytes 1073741824
>>>>>>> pattern sequential
>>>>>>> SEC OPS OPS/SEC BYTES/SEC
>>>>>>> 1 42412 41867.57 171489557.93
>>>>>>> 2 78343 39180.86 160484805.88
>>>>>>> 3 118082 39076.48 160057256.16
>>>>>>> 4 155164 38683.98 158449572.38
>>>>>>> 5 192825 38307.59 156907885.84
>>>>>>> 6 230701 37716.95 154488608.16
>>>>>>> elapsed: 7 ops: 262144 ops/sec: 36862.89 bytes/sec:
>>>>>>> 150990387.29
>>>>>>>
>>>>>>>
>>>>>>> [root@osd01 ~]# fio /home/cephuser/write_256.fio
>>>>>>> write-4M: (g=0): rw=write, bs=4K-4K/4K-4K/4K-4K, ioengine=rbd,
>>>>>>> iodepth=32
>>>>>>> fio-2.2.8
>>>>>>> Starting 1 process
>>>>>>> rbd engine: RBD version: 1.12.0
>>>>>>> Jobs: 1 (f=1): [W(1)] [100.0% done] [0KB/20224KB/0KB /s] [0/5056/0
>>>>>>> iops] [eta 00m:00s]
>>>>>>>
>>>>>>>
>>>>>>> fio /home/cephuser/write_256.fio
>>>>>>> write-4M: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, ioengine=rbd,
>>>>>>> iodepth=32
>>>>>>> fio-2.2.8
>>>>>>> Starting 1 process
>>>>>>> rbd engine: RBD version: 1.12.0
>>>>>>> Jobs: 1 (f=1): [r(1)] [100.0% done] [76096KB/0KB/0KB /s] [19.3K/0/0
>>>>>>> iops] [eta 00m:00s]
>>>>>>> _______________________________________________
>>>>>>> ceph-users mailing list
>>>>>>> [email protected]
>>>>>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>
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