（9）cephpool性能测试
Ceph包含在rados bench RADOS存储集群上执行性能基准测试的命令。该命令将执行写测试和两种类型的读测试。--no-cleanup在测试读写性能时，该选项很重要。默认情况下，该rados bench命令将删除已写入存储池的对象。留在这些对象后面允许两个读取测试来测量顺序和随机读取性能。
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（1）准备工作，清除所有的文件系统缓存
[root@node141 mnt]# echo 3 > /proc/sys/vm/drop_caches
[root@node141 mnt]# sync
（2）创建一个新的存储池
[root@node141 mnt]# ceph osd pool create rbd 128 128
（3）测试一下rbd的写性能，添加 --no-cleanup参数
[root@node141 mnt]# rados bench -p rbd 10 write --no-cleanup
hints = 1
Maintaining 16 concurrent writes of 4194304 bytes to objects of size 4194304 for up to 10 seconds or 0 objects
Object prefix: benchmark_data_node141_28363
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 81 65 259.999 260 0.107901 0.200157
2 16 161 145 289.976 320 0.190659 0.215092
3 16 252 236 314.632 364 0.0807696 0.193549
4 16 351 335 334.958 396 0.191582 0.185652
5 16 445 429 343.157 376 0.158618 0.178393
6 16 548 532 354.621 412 0.162274 0.178178
7 16 652 636 363.378 416 0.190742 0.173784
8 16 753 737 368.448 404 0.15392 0.170866
9 16 863 847 376.391 440 0.103038 0.169129
10 16 964 948 379.144 404 0.138741 0.167306
Total time run: 10.1023
Total writes made: 965
Write size: 4194304
Object size: 4194304
Bandwidth (MB/sec): 382.09
Stddev Bandwidth: 53.3267
Max bandwidth (MB/sec): 440
Min bandwidth (MB/sec): 260
Average IOPS: 95
Stddev IOPS: 13.3317
Max IOPS: 110
Min IOPS: 65
Average Latency(s): 0.167422
Stddev Latency(s): 0.0765119
Max latency(s): 0.668499
Min latency(s): 0.0569634（4）测试一下，10秒的顺序读取：
[root@node141 mnt]# rados bench -p rbd 10 seq
hints = 1
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 16 257 241 963.679 964 0.0607106 0.0623843
2 16 549 533 1065.73 1168 0.0450988 0.0583824
3 16 835 819 1091.76 1144 0.044447 0.057111
Total time run: 3.47417
Total reads made: 965
Read size: 4194304
Object size: 4194304
Bandwidth (MB/sec): 1111.06
Average IOPS: 277
Stddev IOPS: 27.8747
Max IOPS: 292
Min IOPS: 241
Average Latency(s): 0.056581
Max latency(s): 0.388605
Min latency(s): 0.015351（5）测试10秒随机读写性能
[root@node141 mnt]# rados bench -p rbd 10 rand
hints = 1
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 16 408 392 1566.56 1568 0.0715088 0.038812
2 16 794 778 1554.08 1544 0.0219942 0.0396005
3 16 1211 1195 1591.93 1668 0.125987 0.0389289
4 15 1604 1589 1587.9 1576 0.0497586 0.0392412
5 16 2013 1997 1596.67 1632 0.00512184 0.0388821
6 16 2415 2399 1598.52 1608 0.146983 0.0389842
7 16 2806 2790 1593.56 1564 0.110503 0.0391283
8 16 3186 3170 1584.34 1520 0.0226104 0.0393014
9 15 3598 3583 1591.83 1652 0.0117805 0.0392624
10 16 3965 3949 1579.03 1464 0.0752829 0.0395739
Total time run: 10.0536
Total reads made: 3965
Read size: 4194304
Object size: 4194304
Bandwidth (MB/sec): 1577.54
Average IOPS: 394
Stddev IOPS: 15.6308
Max IOPS: 417
Min IOPS: 366
Average Latency(s): 0.0397174
Max latency(s): 0.353027
Min latency(s): 0.00414538（6）要增加并发读取和写入的数量，请使用-t 默认为16个现场的选项，-b参数可以调整正在写入的对象的大小，默认对象大小为4MB。安全的最大对象为16MB.
添加 --run-name
[root@node141 mnt]# rados bench -p rbd 10 write -t 4 --run-name zabbix71
hints = 1
Maintaining 4 concurrent writes of 4194304 bytes to objects of size 4194304 for up to 10 seconds or 0 objects
Object prefix: benchmark_data_node141_28450
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 4 40 36 143.992 144 0.065704 0.103059
2 4 86 82 163.981 184 0.0763531 0.0955013
3 4 126 122 162.641 160 0.106746 0.0953542
4 4 173 169 168.972 188 0.0872597 0.0934176
5 4 218 214 171.171 180 0.170851 0.0927783
6 4 255 251 167.305 148 0.0943133 0.093864
7 4 294 290 165.686 156 0.0976048 0.0959294
8 4 340 336 167.971 184 0.0882485 0.0946923
9 4 386 382 169.748 184 0.0703278 0.0933611
10 4 430 426 170.37 176 0.0623777 0.0933391
Total time run: 10.1109
Total writes made: 431
Write size: 4194304
Object size: 4194304
Bandwidth (MB/sec): 170.51
Stddev Bandwidth: 16.6747
Max bandwidth (MB/sec): 188
Min bandwidth (MB/sec): 144
Average IOPS: 42
Stddev IOPS: 4.16867
Max IOPS: 47
Min IOPS: 36
Average Latency(s): 0.0935851
Stddev Latency(s): 0.0433054
Max latency(s): 0.579434
Min latency(s): 0.0533891
Cleaning up (deleting benchmark objects)
Removed 431 objects
Clean up completed and total clean up time :1.62203(7) 删除rados bench 命令创建的数据
[root@node141 mnt]# rados -p rbd cleanup
Removed 965 objects
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