Есть вышеозначенный контроллер. Собран RAID-10 из 6 дисков. В Windows выдает порядка 2500 IOPS (тестировали при помощи fio, один поток случайно пишет, второй случайно читает). Загрузили в linux, и там не получается даже близко подобраться к таким цифрам.
Вот вывод fio из linux:
readtest: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=32
writetest: (g=0): rw=randwrite, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=32
fio-2.0.14
Starting 2 processes
^Cbs: 2 (f=2): [rw] [0.0% done] [700K/564K/0K /s] [175 /141 /0 iops] [eta 12d:03h:43m:38s]
fio: terminating on signal 2
Jobs: 2 (f=2): [rw] [0.0% done] [580K/488K/0K /s] [145 /122 /0 iops] [eta 12d:04h:41m:14s]
readtest: (groupid=0, jobs=1): err= 0: pid=12357: Thu Apr 3 18:02:40 2014
read : io=24256KB, bw=653721 B/s, iops=159 , runt= 37995msec
slat (usec): min=5 , max=35 , avg=12.02, stdev= 1.39
clat (msec): min=3 , max=1575 , avg=200.44, stdev=147.75
lat (msec): min=3 , max=1575 , avg=200.45, stdev=147.75
clat percentiles (msec):
| 1.00th=[ 12], 5.00th=[ 25], 10.00th=[ 38], 20.00th=[ 70],
| 30.00th=[ 143], 40.00th=[ 176], 50.00th=[ 196], 60.00th=[ 215],
| 70.00th=[ 231], 80.00th=[ 251], 90.00th=[ 351], 95.00th=[ 461],
| 99.00th=[ 824], 99.50th=[ 914], 99.90th=[ 1156], 99.95th=[ 1287],
| 99.99th=[ 1582]
bw (KB/s) : min= 517, max= 814, per=100.00%, avg=640.89, stdev=84.32
lat (msec) : 4=0.02%, 10=0.74%, 20=2.47%, 50=11.20%, 100=10.77%
lat (msec) : 250=54.34%, 500=16.46%, 750=2.85%, 1000=0.84%, 2000=0.31%
cpu : usr=0.13%, sys=0.26%, ctx=6064, majf=0, minf=57
IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.3%, 32=99.5%, >=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.1%, 64=0.0%, >=64=0.0%
issued : total=r=6064/w=0/d=0, short=r=0/w=0/d=0
writetest: (groupid=0, jobs=1): err= 0: pid=12358: Thu Apr 3 18:02:40 2014
write: io=21240KB, bw=571775 B/s, iops=139 , runt= 38039msec
slat (usec): min=5 , max=110 , avg=13.73, stdev= 2.02
clat (msec): min=5 , max=1319 , avg=229.15, stdev=170.27
lat (msec): min=5 , max=1319 , avg=229.17, stdev=170.27
clat percentiles (msec):
| 1.00th=[ 15], 5.00th=[ 30], 10.00th=[ 45], 20.00th=[ 82],
| 30.00th=[ 159], 40.00th=[ 186], 50.00th=[ 206], 60.00th=[ 227],
| 70.00th=[ 249], 80.00th=[ 289], 90.00th=[ 437], 95.00th=[ 594],
| 99.00th=[ 857], 99.50th=[ 930], 99.90th=[ 1106], 99.95th=[ 1156],
| 99.99th=[ 1319]
bw (KB/s) : min= 415, max= 717, per=100.00%, avg=562.44, stdev=77.41
lat (msec) : 10=0.30%, 20=2.11%, 50=9.62%, 100=10.43%, 250=48.12%
lat (msec) : 500=22.60%, 750=4.73%, 1000=1.69%, 2000=0.40%
cpu : usr=0.08%, sys=0.26%, ctx=5311, majf=0, minf=25
IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.2%, 16=0.3%, 32=99.4%, >=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.1%, 64=0.0%, >=64=0.0%
issued : total=r=0/w=5310/d=0, short=r=0/w=0/d=0
Run status group 0 (all jobs):
READ: io=24256KB, aggrb=638KB/s, minb=638KB/s, maxb=638KB/s, mint=37995msec, maxt=37995msec
WRITE: io=21240KB, aggrb=558KB/s, minb=558KB/s, maxb=558KB/s, mint=38039msec, maxt=38039msec
Disk stats (read/write):
sdc: ios=6034/5295, merge=0/0, ticks=1204946/1207353, in_queue=2423520, util=99.77%
Очень хочется понять почему.
