티스토리 뷰

Storage/System&Tools

Ceph benchmark Test

jacobbaek Jacob_baek 2020. 10. 13. 15:33

disk 장애후 ceph가 급속도로 느려진 현상을 보이고 있어 이에 대한 성능측정을 통해 어느 부분에서의 이슈가 있는지 확인 해보고자 한다.

먼저 ceph performance에 대한 글을 한번 읽고 어떤 문제가 있는지 혹은 어떤 방식으로 측정할지는 고민해보는것이 좋다.

Benchmark Test

benchmark test 를 rados 명령을 통해 수행해보자.

아래와 같이 ceph pool을 확인하고

[root@deploy ~]# ceph osd pool ls
kube-hdd
kube-ssd
images
volumes-ssd
volumes-hdd
backups
vms
cinder.volumes
kubernetes

특정한 pool하나를 지정하여 benchmark를 수행해보자.
(혹은 새로 생성해서 진행해도 무방하다.)

[root@deploy ~]# rados bench -p backups 60 write -b 4M -t 16 --no-cleanup
hints = 1
Maintaining 16 concurrent writes of 4194304 bytes to objects of size 4194304 for up to 60 seconds or 0 objects
Object prefix: benchmark_data_ceph001_23644
  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        21         5   20.0286        20    0.239388    0.110094
    2      16        22         6   12.0081         4     1.73452    0.380832
    3      16        30        14   18.6747        32     2.91985     1.13503
    4      16        45        29   29.0086        60     1.17095     1.35023
    5      16        50        34    27.206        20   0.0152663     1.54117
    6      16        55        39   26.0045        20     2.95522     1.77672
    7      16        60        44   25.1464        20   0.0141587     1.83639
    8      16        62        46   23.0027         8     4.21219     1.92558
    9      16        67        51   22.6689        20     2.97088     2.08094
   10      16        71        55   22.0018        16   0.0137967     1.93996
   11      16        81        65    23.638        40     3.68136     1.87953
   12      16        90        74   24.6681        36    0.812743     1.73885
   13      16        99        83   25.5397        36      4.9767     1.63823
   14      16       101        85   24.2867         8     3.51051     1.65365
   15      16       111        95   25.3341        40   0.0212239     1.88131

아래와 같이 benchmark에 따른 data 생성이 이루어진다. (위 명령옵션이 no-cleanup이 있다보니..)

[root@deploy ~]# rados df
POOL_NAME         USED OBJECTS CLONES COPIES MISSING_ON_PRIMARY UNFOUND DEGRADED    RD_OPS      RD    WR_OPS      WR USED COMPR UNDER COMPR 
backups        1.4 GiB     116      0    348                  0       0        0         0     0 B       116 464 MiB        0 B         0 B 
cinder.volumes     0 B       0      0      0                  0       0        0         0     0 B         0     0 B        0 B         0 B 
images          11 GiB     470      0   1410                  0       0        0         0     0 B         0     0 B        0 B         0 B 
kube-hdd       208 GiB   15937      0  47811                  0       0        0 151264489 2.3 TiB 858395176  10 TiB        0 B         0 B 
kube-ssd           0 B       0      0      0                  0       0        0         0     0 B         0     0 B        0 B         0 B 
kubernetes     304 GiB   27085      0  81255                  0       0        0   1949809  86 GiB  50065864 1.1 TiB        0 B         0 B 
vms            4.1 MiB      18      0     54                  0       0        0     25742 421 MiB      6943 1.8 GiB        0 B         0 B 
volumes-hdd     41 GiB    5888      0  17664                  0       0        0     65238  54 MiB     46200 2.4 GiB        0 B         0 B 
volumes-ssd    192 KiB       3      0      9                  0       0        0   1902532 7.1 GiB    186863  23 GiB        0 B         0 B 

total_objects    49517
total_used       543 GiB
total_avail      41 TiB
total_space      42 TiB

실제 확인해보면 아래와 같이 benchmark_data로 시작되는 object들이 생성되어 있음을 확인할 수 있다.

[root@deploy ~]# rados -p lma ls
benchmark_data_ceph001_23719_object34
benchmark_data_ceph001_23719_object16
benchmark_data_ceph001_23719_object11
benchmark_data_ceph001_23719_object21
benchmark_data_ceph001_23719_object14
benchmark_data_ceph001_23719_object4
benchmark_data_ceph001_23719_object9
benchmark_data_ceph001_23719_object31
benchmark_data_ceph001_23719_object5
benchmark_data_ceph001_23719_object12
benchmark_data_ceph001_23719_object32
benchmark_data_ceph001_23719_object20
benchmark_data_ceph001_23719_object15
benchmark_data_ceph001_23719_object8
benchmark_data_ceph001_23719_object3

불필요한 파일이기에 아래와 같이 삭제를 진행한다.

[root@deploy ~]# rados -p lma cleanup
Warning: using slow linear search
Removed 39 objects

다음과 같은 명령으로도 benchmark test를 수행해볼수 있다.
아래 option중 60이 runtime에 대한 부분이라 60초 정도의 대기시간을 가지고 보면 cleanup까지 완료하게 된다.

[root@deploy ~]# rados bench -p images 60 write -b 4M -t 16
hints = 1
Maintaining 16 concurrent writes of 4194304 bytes to objects of size 4194304 for up to 60 seconds or 0 objects
Object prefix: benchmark_data_ceph001_23891
  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        20         4   16.0218        16    0.261381    0.102508
    2      16        20         4    8.0052         0           -    0.102508
    3      16        22         6   8.00329         4       2.646    0.851604
    4      16        28        12   12.0035        24   0.0149619     1.64593
    5      16        29        13   10.4023         4     2.29119     1.69556
    6      16        36        20   13.3356        28     3.88388     2.24519
    7      16        39        23   13.1447        12    0.754656     2.36526
    8      16        40        24   12.0014         4     1.92938      2.3471
    9      16        42        26   11.5566         8      8.7908     2.84277
   10      16        43        27   10.8008         4     4.11371     2.88984
   11      16        48        32   11.6371        20     4.88391       3.098
   12      16        57        41   13.6674        36   0.0135469     2.54526
   13      16        59        43   13.2313         8     12.8694     2.85755
   14      16        61        45   12.8576         8     2.76138     2.88132
   15      16        65        49    13.067        16     3.45294      3.5127
   16      16        67        51   12.7503         8     5.02457     3.77546
   17      16        70        54   12.7061        12     9.02825     3.96778
   18      16        74        58    12.889        16     6.06797     4.07444
   19      16        75        59   12.4212         4     2.81802     4.05314
2020-10-13 15:31:22.669988 min lat: 0.0134455 max lat: 15.4017 avg lat: 4.05314
  sec Cur ops   started  finished  avg MB/s  cur MB/s last lat(s)  avg lat(s)
   20      16        75        59      11.8         0           -     4.05314
   21      16        87        71   13.5238        24    0.480974     3.81639
   22      16        88        72   13.0909         4     1.46078     3.78367
   23      16        91        75   13.0434        12     5.83569     4.04294
   24      16        93        77   12.8332         8    0.892728     3.99609
   25      16        96        80   12.7999        12     1.06257     4.15543
   26      16        98        82   12.6152         8     0.67585     4.10257
   27      16       104        88   13.0369        24    0.378399     3.92878
   28      16       104        88   12.5712         0           -     3.92878
   29      16       107        91   12.5515         6     2.84133     3.97163
   30      16       111        95   12.6664        16     3.17491     3.88385
   31      16       112        96   12.3868         4     1.71044     3.86121
   32      16       112        96   11.9997         0           -     3.86121
   33      16       115        99   11.9997         6     3.02306     4.05637
   34      16       117       101   11.8821         8     1.01826     3.98924
   35      16       119       103   11.7711         8     4.29856     4.14715
   36      16       119       103   11.4441         0           -     4.14715
   37      16       121       105    11.351         4      2.6323     4.12513
   38      16       121       105   11.0523         0           -     4.12513
   39      16       122       106   10.8715         2     5.32104     4.13641
2020-10-13 15:31:42.671241 min lat: 0.0134455 max lat: 19.9444 avg lat: 4.23222
  sec Cur ops   started  finished  avg MB/s  cur MB/s last lat(s)  avg lat(s)
   40      16       125       109   10.8997        12     4.17409     4.23222
   41      16       125       109   10.6338         0           -     4.23222
   42      16       126       110   10.4759         2     5.24569     4.24143
   43      16       132       116   10.7904        24   0.0317681     4.74179
   44      16       132       116   10.5451         0           -     4.74179
   45      16       138       122   10.8441        12      2.3702     4.87268
   46      16       142       126   10.9562        16     15.8002     5.05366
   47      16       148       132   11.2337        24     4.53609     5.24322
   48      16       151       135   11.2496        12      5.5353      5.2506
   49      16       156       140   11.4282        20     2.70998     5.16667
   50      16       162       146   11.6796        24   0.0166532     5.01238
   51      16       168       152   11.9211        24    0.513471      4.8944
   52      16       174       158   12.1534        24     7.09976     5.04459
   53      16       181       165   12.4524        28     3.00569     4.94404
   54      16       181       165   12.2218         0           -     4.94404
   55      16       190       174   12.6541        18   0.0145103     4.77253
   56      16       191       175   12.4995         4     2.35737     4.75873
   57      16       196       180   12.6311        20     1.46972     4.71671
   58      16       202       186   12.8271        24     1.16287     4.66769
   59      16       204       188   12.7453         8     1.99294     4.63563
2020-10-13 15:32:02.672514 min lat: 0.0134455 max lat: 30.7736 avg lat: 4.62292
  sec Cur ops   started  finished  avg MB/s  cur MB/s last lat(s)  avg lat(s)
   60      16       205       189   12.5995         4     2.23494     4.62292
   61      16       205       189   12.3929         0           -     4.62292
   62      16       206       190   12.2576         2     16.2268       4.684
   63      16       206       190    12.063         0           -       4.684
   64      16       206       190   11.8745         0           -       4.684
   65      16       206       190   11.6918         0           -       4.684
   66      16       206       190   11.5147         0           -       4.684
   67      16       206       190   11.3428         0           -       4.684
   68      16       206       190    11.176         0           -       4.684
   69      16       206       190    11.014         0           -       4.684
   70      16       206       190   10.8567         0           -       4.684
   71      16       206       190   10.7038         0           -       4.684
   72       8       206       198   10.9995       3.2      12.963     5.12861
   73       8       206       198   10.8488         0           -     5.12861
   74       8       206       198   10.7022         0           -     5.12861
Total time run:         74.7826
Total writes made:      206
Write size:             4194304
Object size:            4194304
Bandwidth (MB/sec):     11.0186
Stddev Bandwidth:       9.35059
Max bandwidth (MB/sec): 36
Min bandwidth (MB/sec): 0
Average IOPS:           2
Stddev IOPS:            2.36447
Max IOPS:               9
Min IOPS:               0
Average Latency(s):     5.67049
Stddev Latency(s):      6.46971
Max latency(s):         30.7736
Min latency(s):         0.0134455
Cleaning up (deleting benchmark objects)
Removed 206 objects
Clean up completed and total clean up time :7.81279

위 결과는 write에 대한 결과이다. 

추가로 각 osd 별 bench 결과를 확인할수도 있다.

[root@deploy ~]# ceph tell osd.3 bench
{
    "bytes_written": 1073741824,
    "blocksize": 4194304,
    "elapsed_sec": 2.2708148029999999,
    "bytes_per_sec": 472844294.73573411,
    "iops": 112.73486488717415
}

위의 결과를 간단히 보면 472MB/sec 의 throughput와 112 IOPS를 기록했다고 보면 된다.

OpenStack

가급적 VM에서 fio 명령을 사용하여 benchmark 결과를 만들어보는 것을 추천한다.

중간단에서 어떤 문제가 있을지 모르기에 실제 VM에서 volume을 mount하여 테스트 해보는것이 좋다.

아래와 같은 두가지 방식을 제안하고 있다.

fio

fio command를 이용한 방법은 아래 링크를 참고한다.

rbd bench --io-type write

기존 서비스에 영향을 최소화 하기위해 block device에 대한 benchmark를 수행할 pool을 새로 생성한다.

[root@deploy001 test]# ceph osd pool create rbdbench 32 32
pool 'rbdbench' created

block 이미지를 생성하고 생성한 이미지(image-test)를 map 시켜준다.
(당시 아래와 같은 feature의 disable을 요구하고 있기에 이를 맞춰준다.)

[root@deploy test]# rbd create image-test --size 1024 --pool rbdbench
[root@deploy test]# rbd map image-test --pool rbdbench --name client.admin
rbd: sysfs write failed
RBD image feature set mismatch. You can disable features unsupported by the kernel with "rbd feature disable rbdbench/image-test object-map fast-diff deep-flatten".
In some cases useful info is found in syslog - try "dmesg | tail".
rbd: map failed: (6) No such device or address
[root@deploy test]# rbd feature disable rbdbench/image-test object-map fast-diff deep-flatten
[root@deploy test]# rbd map image-test --pool rbdbench --name client.admin
/dev/rbd0
[root@deploy001 test]# ls -al /dev/ | grep rbd
drwxr-xr-x.  3 root root          60 10월 13 16:13 rbd
brw-rw----.  1 root disk    252,   0 10월 13 16:13 rbd0

위와 같이 생성이 완료되면 /dev/rbd0로 map 된다.

이제 해당 block device의 지정한 filesystem(ext4, 이는 필요에 따라 변경가능)로 생성해준다.

[root@deploy test]# /sbin/mkfs.ext4 -m0 /dev/rbd/rbdbench/image-test 
mke2fs 1.42.9 (28-Dec-2013)
Discarding device blocks: done                            
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=1024 blocks, Stripe width=1024 blocks
65536 inodes, 262144 blocks
0 blocks (0.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=268435456
8 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks: 
    32768, 98304, 163840, 229376

Allocating group tables: done                            
Writing inode tables: done                            
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done

[root@deploy001 test]# mkdir /mnt/ceph-block-device
[root@deploy001 test]# mount /dev/rbd/rbdbench/image-test /mnt/ceph-block-device/

모두 완료되면 mount할 directory를 생성하여 mount한다.

이제 rbd bench 명령을 사용해 benchmark를 측정해보자.

[root@deploy001 test]# rbd bench --io-type write image-test --pool=rbdbench
bench  type write io_size 4096 io_threads 16 bytes 1073741824 pattern sequential
  SEC       OPS   OPS/SEC   BYTES/SEC
    1      8496   6864.53  28117106.97
    2      9952   4827.13  19771912.36
    3     13136   4165.99  17063885.24
    4     17456   3989.96  16342872.00
    5     19520   3865.46  15832923.46
    6     22288   2800.41  11470483.30
    7     23936   2662.10  10903971.76
    8     26080   2390.40  9791083.33
    9     26928   2015.32  8254761.59
   10     28448   1578.50  6465550.14
   11     29696   1502.94  6156060.21
^C2020-10-13 16:26:10.357 7f0f4effd700 -1 received  signal: Interrupt, si_code : 128, si_value (int): 534070624, si_value (ptr): 0x7ffe1fd54560, si_errno: 0, si_pid : 0, si_uid : 0, si_addr0, si_status534070624
elapsed:    16  ops:    30507  ops/sec:  1845.00  bytes/sec: 7557114.57

제일 마지막 결과를 확인하여 실제 어느정도의 iops를 가지는지 확인해볼수 있다.

ops:    30507  ops/sec:  1845.00  bytes/sec: 7557114.57

테스트가 모두 완료된 후 아래와 같이 cleanup 과정을 거친다.

[root@deploy001 test]# umount /mnt/ceph-block-device/
[root@deploy001 test]# rbd unmap /dev/rbd0
[root@deploy001 test]# rados -p rbdbench cleanup

마지막으로 pool을 삭제한다.

[root@deploy001 test]# ceph osd pool delete rbdbench rbdbench --yes-i-really-really-mean-it
pool 'rbdbench' removed

아래 사이트를 참고하여 위와 같은 작업을 수행하였다.

Performance Tunning

CPU performance 설정인데 2016년도 자료로 현재는 default로 performance로 셋팅되어 있다. (필자가 사용하는 ceph-ansible 기준)

Latency 관련 내용

Ceph pg 조정

아래 링크를 기반으로 pg num을 조정후 아래와 같이 좀더 나은 성능을 확인하였다.

[root@deploy001 ~]# rados bench -p images 60 write -b 4M -t 16
hints = 1
Maintaining 16 concurrent writes of 4194304 bytes to objects of size 4194304 for up to 60 seconds or 0 objects
Object prefix: benchmark_data_deploy001_52437
  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       266       250    1001.6      1000   0.0137876   0.0484179
    2      16       372       356     712.5       424    0.012313   0.0746386
    3      16       380       364   485.526        32   0.0172027   0.0825709
    4      16       391       375   375.095        44   0.0170752    0.105056
    5      16       405       389   311.252        56   0.0800455    0.150878
    6      16       413       397   264.694        32   0.0138733      0.1597
    7      16       432       416   237.729        76     1.55959    0.227514
    8      16       452       436   218.006        80   0.0132394     0.24204
    9      16       460       444   197.334        32    0.379661     0.26163
   10      16       478       462   184.798        72   0.0131734    0.293294
   11      16       503       487   177.086       100    0.270308    0.313229
   12      16       520       504   167.991        68    0.857487    0.323478
   13      16       544       528    162.45        96   0.0128463    0.357975
   14      16       558       542   154.845        56   0.0607749     0.36093
   15      16       573       557    148.52        60    0.295766    0.391108
   16      16       586       570   142.486        52    0.339325    0.398898
   17      16       599       583   137.162        52   0.0512127    0.426197
   18      16       611       595   132.207        48     3.71891    0.445754
   19      16       632       616   129.669        84     0.30158    0.454912
2020-10-26 18:21:00.852223 min lat: 0.0115086 max lat: 6.27441 avg lat: 0.452148
  sec Cur ops   started  finished  avg MB/s  cur MB/s last lat(s)  avg lat(s)
   20      16       647       631   126.185        60    0.235778    0.452148
   21      16       670       654   124.556        92    0.435795    0.480625
   22      16       685       669   121.621        60   0.0162513    0.498286
   23      16       691       675   117.376        24     1.69131    0.510926
   24      16       709       693   115.485        72   0.0147364    0.528154
   25      16       732       716   114.542        92    0.013838    0.539504
   26      16       749       733   112.752        68     2.70373    0.547057
   27      16       769       753   111.538        80   0.0128841    0.549705
   28      16       782       766    109.41        52   0.0129247    0.557695
   29      16       812       796   109.774       120   0.0452509    0.575331
   30      16       824       808   107.715        48     1.91946    0.572266
   31      16       836       820   105.787        48    0.361165    0.575898
   32      16       854       838   104.731        72   0.0150643    0.585064
   33      16       870       854   103.496        64   0.0125555    0.590651
   34      16       892       876    103.04        88   0.0705526    0.608154
   35      16       899       883   100.896        28      1.3139    0.610418
   36      16       920       904   100.426        84    0.396711    0.625457
   37      16       937       921   99.5491        68    0.395234    0.626916
   38      16       959       943   99.2448        88    0.255478    0.635579
   39      16       969       953   97.7253        40     1.76258    0.640573
2020-10-26 18:21:20.857338 min lat: 0.0115086 max lat: 6.60594 avg lat: 0.640597
  sec Cur ops   started  finished  avg MB/s  cur MB/s last lat(s)  avg lat(s)
   40      16       995       979   97.8817       104   0.0717126    0.640597
   41      16      1004       988    96.372        36   0.0126092    0.641064
   42      16      1022      1006   95.7914        72    0.833975    0.651894
   43      16      1037      1021   94.9585        60   0.0140078     0.65484
   44      16      1044      1028   93.4366        28     3.49095    0.661643
   45      16      1058      1042   92.6045        56    0.307017    0.667844
   46      16      1079      1063   92.4172        84    0.342982    0.673593
   47      16      1094      1078   91.7273        60    0.218679     0.67623
   48      16      1112      1096    91.316        72   0.0151919    0.682937
   49      16      1121      1105    90.187        36     3.47224      0.6926
   50      16      1144      1128    90.223        92   0.0131828    0.690731
   51      16      1162      1146   89.8654        72    0.383499    0.688672
   52      16      1171      1155   88.8294        36    0.353203    0.690701
   53      16      1188      1172   88.4362        68   0.0755775    0.700197
   54      16      1208      1192   88.2798        80    0.582108    0.705604
   55      16      1220      1204   87.5473        48   0.0125563    0.705474
   56      16      1235      1219   87.0551        60   0.0132853    0.705285
   57      16      1257      1241   87.0713        88   0.0135484    0.710079
   58      16      1274      1258   86.7423        68   0.0130393    0.714436
   59      16      1286      1270   86.0855        48    0.214974    0.710559
2020-10-26 18:21:40.861172 min lat: 0.0115086 max lat: 7.89654 avg lat: 0.720517
  sec Cur ops   started  finished  avg MB/s  cur MB/s last lat(s)  avg lat(s)
   60      16      1310      1294   86.2504        96    0.548454    0.720517
   61      15      1311      1296   84.9675         8    0.293133    0.719887
Total time run:         61.8125
Total writes made:      1311
Write size:             4194304
Object size:            4194304
Bandwidth (MB/sec):     84.8372
Stddev Bandwidth:       129.698
Max bandwidth (MB/sec): 1000
Min bandwidth (MB/sec): 8
Average IOPS:           21
Stddev IOPS:            32.4246
Max IOPS:               250
Min IOPS:               2
Average Latency(s):     0.748189
Stddev Latency(s):      1.22763
Max latency(s):         8.52709
Min latency(s):         0.0115086
Cleaning up (deleting benchmark objects)
Removed 1311 objects
Clean up completed and total clean up time :0.926593

Ceph Performance 관련 blogs

구성환경에 따라 다르겠지만 (All-flash, SAS/SSD 조합, 등등...) BlueStore를 사용하는 환경에서 한번 읽어보면 좋을거라 판단된다.

참고사이트

'Storage > System&Tools' 카테고리의 다른 글

Ceph benchmark Test  (0) 2020.10.13
Ceph-csi  (0) 2020.04.21
Ceph  (0) 2017.03.10
댓글
댓글쓰기 폼
공지사항
최근에 달린 댓글
Total
48,538
Today
6
Yesterday
103
링크
«   2020/10   »
        1 2 3
4 5 6 7 8 9 10
11 12 13 14 15 16 17
18 19 20 21 22 23 24
25 26 27 28 29 30 31
글 보관함