replication size is always 2
DB/WAL on HDD in this case
I tried with OSDs with WAL/DB on SSD - they exhibit the same symptoms (
cur MB/s 0 )
In summary, it does not matter
- which server ( any 2 will work better than any 3 or 4)
- replication size ( it tried with size 2 and 3 )
- location of WAL/DB ( on separate SSD or same HDD)
Thanks
Steven
On Thu, 19 Apr 2018 at 12:06, Hans van den Bogert <hansbog...@gmail.com>
wrote:
> I take it that the first bench is with replication size 2, the second
> bench is with replication size 3? Same for the 4 node OSD scenario?
>
> Also please let us know how you setup block.db and Wal, are they on the
> SSD?
>
> On Thu, Apr 19, 2018, 14:40 Steven Vacaroaia <ste...@gmail.com> wrote:
>
>> Sure ..thanks for your willingness to help
>>
>> Identical servers
>>
>> Hardware
>> DELL R620, 6 cores, 64GB RAM, 2 x 10 GB ports,
>> Enterprise HDD 600GB( Seagate ST600MM0006), Enterprise grade SSD 340GB
>> (Toshiba PX05SMB040Y)
>>
>>
>> All tests done with the following command
>> rados bench -p rbd 50 write --no-cleanup && rados bench -p rbd 50 seq
>>
>>
>> ceph osd pool ls detail
>> "pool_name": "rbd",
>> "flags": 1,
>> "flags_names": "hashpspool",
>> "type": 1,
>> "size": 2,
>> "min_size": 1,
>> "crush_rule": 1,
>> "object_hash": 2,
>> "pg_num": 64,
>> "pg_placement_num": 64,
>> "crash_replay_interval": 0,
>> "last_change": "354",
>> "last_force_op_resend": "0",
>> "last_force_op_resend_preluminous": "0",
>> "auid": 0,
>> "snap_mode": "selfmanaged",
>> "snap_seq": 0,
>> "snap_epoch": 0,
>> "pool_snaps": [],
>> "removed_snaps": "[]",
>> "quota_max_bytes": 0,
>> "quota_max_objects": 0,
>> "tiers": [],
>> "tier_of": -1,
>> "read_tier": -1,
>> "write_tier": -1,
>> "cache_mode": "none",
>> "target_max_bytes": 0,
>> "target_max_objects": 0,
>> "cache_target_dirty_ratio_micro": 400000,
>> "cache_target_dirty_high_ratio_micro": 600000,
>> "cache_target_full_ratio_micro": 800000,
>> "cache_min_flush_age": 0,
>> "cache_min_evict_age": 0,
>> "erasure_code_profile": "",
>> "hit_set_params": {
>> "type": "none"
>> },
>> "hit_set_period": 0,
>> "hit_set_count": 0,
>> "use_gmt_hitset": true,
>> "min_read_recency_for_promote": 0,
>> "min_write_recency_for_promote": 0,
>> "hit_set_grade_decay_rate": 0,
>> "hit_set_search_last_n": 0,
>> "grade_table": [],
>> "stripe_width": 0,
>> "expected_num_objects": 0,
>> "fast_read": false,
>> "options": {},
>> "application_metadata": {}
>> }
>>
>>
>> ceph osd crush rule dump
>> [
>> {
>> "rule_id": 0,
>> "rule_name": "replicated_rule",
>> "ruleset": 0,
>> "type": 1,
>> "min_size": 1,
>> "max_size": 10,
>> "steps": [
>> {
>> "op": "take",
>> "item": -1,
>> "item_name": "default"
>> },
>> {
>> "op": "chooseleaf_firstn",
>> "num": 0,
>> "type": "host"
>> },
>> {
>> "op": "emit"
>> }
>> ]
>> },
>> {
>> "rule_id": 1,
>> "rule_name": "rbd",
>> "ruleset": 1,
>> "type": 1,
>> "min_size": 1,
>> "max_size": 10,
>> "steps": [
>> {
>> "op": "take",
>> "item": -9,
>> "item_name": "sas"
>> },
>> {
>> "op": "chooseleaf_firstn",
>> "num": 0,
>> "type": "host"
>> },
>> {
>> "op": "emit"
>> }
>> ]
>> }
>> ]
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> 2 servers, 2 OSD
>>
>> ceph osd tree
>> ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF
>> -9 4.00000 root sas
>> -10 1.00000 host osd01-sas
>> 2 hdd 1.00000 osd.2 up 0 1.00000
>> -11 1.00000 host osd02-sas
>> 3 hdd 1.00000 osd.3 up 0 1.00000
>> -12 1.00000 host osd03-sas
>> 5 hdd 1.00000 osd.5 up 1.00000 1.00000
>> -19 1.00000 host osd04-sas
>> 6 hdd 1.00000 osd.6 up 1.00000 1.00000
>>
>>
>> 2018-04-19 09:19:01.266010 min lat: 0.0412473 max lat: 1.03227 avg lat:
>> 0.331163
>> sec Cur ops started finished avg MB/s cur MB/s last lat(s) avg
>> lat(s)
>> 40 16 1941 1925 192.478 192 0.315461
>> 0.331163
>> 41 16 1984 1968 191.978 172 0.262268
>> 0.331529
>> 42 16 2032 2016 191.978 192 0.326608
>> 0.332061
>> 43 16 2081 2065 192.071 196 0.345757
>> 0.332389
>> 44 16 2123 2107 191.524 168 0.307759
>> 0.332745
>> 45 16 2166 2150 191.09 172 0.318577
>> 0.333613
>> 46 16 2214 2198 191.109 192 0.329559
>> 0.333703
>> 47 16 2257 2241 190.702 172 0.423664
>> 0.33427
>> 48 16 2305 2289 190.729 192 0.357342
>> 0.334386
>> 49 16 2348 2332 190.346 172 0.30218
>> 0.334735
>> 50 16 2396 2380 190.379 192 0.318226
>> 0.334981
>> Total time run: 50.281886
>> Total writes made: 2397
>> Write size: 4194304
>> Object size: 4194304
>> Bandwidth (MB/sec): 190.685
>> Stddev Bandwidth: 24.5781
>> Max bandwidth (MB/sec): 340
>> Min bandwidth (MB/sec): 164
>> Average IOPS: 47
>> Stddev IOPS: 6
>> Max IOPS: 85
>> Min IOPS: 41
>> Average Latency(s): 0.335515
>> Stddev Latency(s): 0.0867836
>> Max latency(s): 1.03227
>> Min latency(s): 0.0412473
>>
>> 2018-04-19 09:19:52.340092 min lat: 0.0209445 max lat: 14.9208 avg lat:
>> 1.31352
>> sec Cur ops started finished avg MB/s cur MB/s last lat(s) avg
>> lat(s)
>> 40 16 296 280 27.9973 0 -
>> 1.31352
>> 41 16 296 280 27.3144 0 -
>> 1.31352
>> 42 16 296 280 26.664 0 -
>> 1.31352
>> 43 16 323 307 28.5553 9 0.0429661
>> 2.20267
>> 44 16 323 307 27.9063 0 -
>> 2.20267
>> 45 16 363 347 30.8414 80 0.0922424
>> 2.05975
>> 46 16 370 354 30.7795 28 0.0302223
>> 2.02055
>> 47 16 370 354 30.1246 0 -
>> 2.02055
>> 48 16 386 370 30.8303 32 2.72624
>> 2.06407
>> 49 16 386 370 30.2011 0 -
>> 2.06407
>> 50 16 400 384 30.7169 28 2.10543
>> 2.07055
>> 51 16 401 385 30.1931 4 2.53183
>> 2.07175
>> 52 16 401 385 29.6124 0 -
>> 2.07175
>> 53 16 401 385 29.0537 0 -
>> 2.07175
>> 54 16 401 385 28.5157 0 -
>> 2.07175
>> 55 16 401 385 27.9972 0 -
>> 2.07175
>> 56 16 401 385 27.4972 0 -
>> 2.07175
>> Total time run: 56.042520
>> Total reads made: 401
>> Read size: 4194304
>> Object size: 4194304
>> Bandwidth (MB/sec): 28.6211
>> Average IOPS: 7
>> Stddev IOPS: 11
>> Max IOPS: 47
>> Min IOPS: 0
>> Average Latency(s): 2.23525
>> Max latency(s): 29.5553
>> Min latency(s): 0.0209445
>>
>>
>>
>>
>>
>> 4 servers, 4 osds
>>
>> ceph osd tree
>> ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF
>> -9 4.00000 root sas
>> -10 1.00000 host osd01-sas
>> 2 hdd 1.00000 osd.2 up 1.00000 1.00000
>> -11 1.00000 host osd02-sas
>> 3 hdd 1.00000 osd.3 up 1.00000 1.00000
>> -12 1.00000 host osd03-sas
>> 5 hdd 1.00000 osd.5 up 1.00000 1.00000
>> -19 1.00000 host osd04-sas
>> 6 hdd 1.00000 osd.6 up 1.00000 1.00000
>>
>>
>>
>>
>> 2018-04-19 09:35:43.558843 min lat: 0.0141657 max lat: 11.3013 avg lat:
>> 1.25618
>> sec Cur ops started finished avg MB/s cur MB/s last lat(s) avg
>> lat(s)
>> 40 16 482 466 46.5956 0 -
>> 1.25618
>> 41 16 488 472 46.0444 12 0.0175485
>> 1.25181
>> 42 16 488 472 44.9481 0 -
>> 1.25181
>> 43 16 488 472 43.9028 0 -
>> 1.25181
>> 44 16 562 546 49.6316 98.6667 0.0150341
>> 1.26385
>> 45 16 569 553 49.1508 28 0.0151556
>> 1.25516
>> 46 16 569 553 48.0823 0 -
>> 1.25516
>> 47 16 569 553 47.0593 0 -
>> 1.25516
>> 48 16 569 553 46.0789 0 -
>> 1.25516
>> 49 16 569 553 45.1386 0 -
>> 1.25516
>> 50 16 569 553 44.2358 0 -
>> 1.25516
>> 51 16 569 553 43.3684 0 -
>> 1.25516
>> Total time run: 51.724920
>> Total writes made: 570
>> Write size: 4194304
>> Object size: 4194304
>> Bandwidth (MB/sec): 44.0793
>> Stddev Bandwidth: 55.3843
>> Max bandwidth (MB/sec): 232
>> Min bandwidth (MB/sec): 0
>> Average IOPS: 11
>> Stddev IOPS: 13
>> Max IOPS: 58
>> Min IOPS: 0
>> Average Latency(s): 1.45175
>> Stddev Latency(s): 2.9411
>> Max latency(s): 11.3013
>> Min latency(s): 0.0141657
>>
>>
>>
>> 2018-04-19 09:36:35.633624 min lat: 0.00804825 max lat: 10.2583 avg lat:
>> 1.03388
>> sec Cur ops started finished avg MB/s cur MB/s last lat(s) avg
>> lat(s)
>> 40 16 479 463 46.2955 0 -
>> 1.03388
>> 41 16 540 524 51.1169 24.4 0.00913275
>> 1.23193
>> 42 16 540 524 49.8999 0 -
>> 1.23193
>> 43 16 541 525 48.8324 2 2.31401
>> 1.23399
>> 44 16 541 525 47.7226 0 -
>> 1.23399
>> 45 16 541 525 46.6621 0 -
>> 1.23399
>> 46 16 541 525 45.6477 0 -
>> 1.23399
>> 47 16 541 525 44.6765 0 -
>> 1.23399
>> 48 16 541 525 43.7458 0 -
>> 1.23399
>> 49 16 541 525 42.853 0 -
>> 1.23399
>> 50 16 541 525 41.996 0 -
>> 1.23399
>> 51 16 541 525 41.1725 0 -
>> 1.23399
>> Total time run: 51.530655
>> Total reads made: 542
>> Read size: 4194304
>> Object size: 4194304
>> Bandwidth (MB/sec): 42.072
>> Average IOPS: 10
>> Stddev IOPS: 15
>> Max IOPS: 62
>> Min IOPS: 0
>> Average Latency(s): 1.5204
>> Max latency(s): 11.4841
>> Min latency(s): 0.00627081
>>
>>
>>
>> Many thanks
>> Steven
>>
>>
>>
>>
>> On Thu, 19 Apr 2018 at 08:42, Hans van den Bogert <hansbog...@gmail.com>
>> wrote:
>>
>>> Hi Steven,
>>>
>>> There is only one bench. Could you show multiple benches of the
>>> different scenarios you discussed? Also provide hardware details.
>>>
>>> Hans
>>>
>>> On Apr 19, 2018 13:11, "Steven Vacaroaia" <ste...@gmail.com> wrote:
>>>
>>> Hi,
>>>
>>> Any idea why 2 servers with one OSD each will provide better performance
>>> than 3 ?
>>>
>>> Servers are identical
>>> Performance is impacted irrespective if I used SSD for WAL/DB or not
>>> Basically, I am getting lots of cur MB/s zero
>>>
>>> Network is separate 10 GB for public and private
>>> I tested it with iperf and I am getting 9.3 Gbs
>>>
>>> I have tried replication by 2 and 3 with same results ( much better for
>>> 2 servers than 3 )
>>>
>>> reinstalled CEPH multiple times
>>> ceph.conf very simple - no major customization ( see below)
>>> I am out of ideas - any hint will be TRULY appreciated
>>>
>>> Steven
>>>
>>>
>>>
>>> auth_cluster_required = cephx
>>> auth_service_required = cephx
>>> auth_client_required = cephx
>>>
>>>
>>> public_network = 10.10.30.0/24
>>> cluster_network = 192.168.0.0/24
>>>
>>>
>>> osd_pool_default_size = 2
>>> osd_pool_default_min_size = 1 # Allow writing 1 copy in a degraded state
>>> osd_crush_chooseleaf_type = 1
>>>
>>>
>>> [mon]
>>> mon_allow_pool_delete = true
>>> mon_osd_min_down_reporters = 1
>>>
>>> [osd]
>>> osd_mkfs_type = xfs
>>> osd_mount_options_xfs =
>>> "rw,noatime,nodiratime,attr2,logbufs=8,logbsize=256k,largeio,inode64,swalloc,allocsize=4M"
>>> osd_mkfs_options_xfs = "-f -i size=2048"
>>> bluestore_block_db_size = 32212254720
>>> bluestore_block_wal_size = 1073741824
>>>
>>> rados bench -p rbd 120 write --no-cleanup && rados bench -p rbd 120 seq
>>> hints = 1
>>> Maintaining 16 concurrent writes of 4194304 bytes to objects of size
>>> 4194304 for up to 120 seconds or 0 objects
>>> Object prefix: benchmark_data_osd01_383626
>>> sec Cur ops started finished avg MB/s cur MB/s last lat(s) avg
>>> lat(s)
>>> 0 0 0 0 0 0 -
>>> 0
>>> 1 16 57 41 163.991 164 0.197929
>>> 0.065543
>>> 2 16 57 41 81.992 0 -
>>> 0.065543
>>> 3 16 67 51 67.9936 20 0.0164632
>>> 0.249939
>>> 4 16 67 51 50.9951 0 -
>>> 0.249939
>>> 5 16 71 55 43.9958 8 0.0171439
>>> 0.319973
>>> 6 16 181 165 109.989 440 0.0159057
>>> 0.563746
>>> 7 16 182 166 94.8476 4 0.221421
>>> 0.561684
>>> 8 16 182 166 82.9917 0 -
>>> 0.561684
>>> 9 16 240 224 99.5458 116 0.0232989
>>> 0.638292
>>> 10 16 264 248 99.1901 96 0.0222669
>>> 0.583336
>>> 11 16 264 248 90.1729 0 -
>>> 0.583336
>>> 12 16 285 269 89.6579 42 0.0165706
>>> 0.600606
>>> 13 16 285 269 82.7611 0 -
>>> 0.600606
>>> 14 16 310 294 83.9918 50 0.0254241
>>> 0.756351
>>>
>>>
>>>
>>
>>
>>
>>
>>> _______________________________________________
>>> ceph-users mailing list
>>> ceph-users@lists.ceph.com
>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>>>
>>>
>>>
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