VSAN

---Диск с cache=writeback bus=virtio---

Послед. запись

fio -filename=/dev/sda -direct=1 -sync=1 -rw=write -bssplit=512/10:1k/5:2k/5:4k/60:8k/2:16k/4:32k/4:64k/10  -numjobs=1 -iodepth=1 --ioengine=libaio -runtime=60 -size=1m -time_based -group_reporting -name=journal-test
  write: io=646322KB, bw=10772KB/s, iops=1136, runt= 60001msec
    slat (usec): min=3, max=497, avg= 9.61, stdev= 4.28
    clat (usec): min=295, max=201432, avg=868.26, stdev=1867.70
     lat (usec): min=302, max=201445, avg=878.01, stdev=1868.03
  WRITE: io=646321KB, aggrb=10771KB/s, minb=10771KB/s, maxb=10771KB/s, mint=60001msec, maxt=60001msec
Disk stats (read/write):
  sda: ios=26898/68109, merge=0/0, ticks=1173/57579, in_queue=58731, util=96.02%

Случайная запись

journal-test: (g=0): rw=randwrite, bs=512-64K/512-64K/512-64K, ioengine=libaio, iodepth=1
  write: io=361221KB, bw=6020.3KB/s, iops=1198, runt= 60001msec
    slat (usec): min=4, max=120, avg= 7.69, stdev= 3.29
    clat (usec): min=300, max=202073, avg=824.06, stdev=2710.07
     lat (usec): min=306, max=202081, avg=831.89, stdev=2710.21
Run status group 0 (all jobs):
  WRITE: io=361221KB, aggrb=6020KB/s, minb=6020KB/s, maxb=6020KB/s, mint=60001msec, maxt=60001msec

Disk stats (read/write):
  sda: ios=14157/71884, merge=0/0, ticks=518/58153, in_queue=58663, util=96.93%

Последовательное чтение

Jobs: 1 (f=1): [R(1)] [100.0% done] [405.9MB/0KB/0KB /s] [43.9K/0/0 iops] [eta 00m:00s]
journal-test: (groupid=0, jobs=1): err= 0: pid=12473: Thu Feb 22 17:29:35 2018
  read : io=24179MB, bw=412676KB/s, iops=43524, runt= 59996msec
    slat (usec): min=3, max=82, avg= 3.95, stdev= 1.01
    clat (usec): min=0, max=1038, avg=17.97, stdev= 3.54
     lat (usec): min=16, max=1043, avg=22.01, stdev= 4.05
Run status group 0 (all jobs):
   READ: io=24179MB, aggrb=412675KB/s, minb=412675KB/s, maxb=412675KB/s, mint=59996msec, maxt=59996msec
Disk stats (read/write):
  sda: ios=2609055/0, merge=0/0, ticks=46695/0, in_queue=46259, util=77.10%

Произвольное чтение

journal-test: (g=0): rw=randread, bs=512-64K/512-64K/512-64K, ioengine=libaio, iodepth=1
fio-2.2.8
journal-test: (groupid=0, jobs=1): err= 0: pid=12478: Thu Feb 22 17:34:15 2018
  read : io=13537MB, bw=231047KB/s, iops=46028, runt= 59998msec
    slat (usec): min=3, max=58, avg= 3.57, stdev= 0.73
    clat (usec): min=8, max=770, avg=16.95, stdev= 2.10
     lat (usec): min=16, max=774, avg=20.61, stdev= 2.35
Run status group 0 (all jobs):
   READ: io=13537MB, aggrb=231046KB/s, minb=231046KB/s, maxb=231046KB/s, mint=59998msec, maxt=59998msec

Disk stats (read/write):
  sda: ios=2759250/0, merge=0/0, ticks=44330/0, in_queue=43902, util=73.17%