ENELIS

ENELIS
serverastra.ru
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29.08.2008
SAS vs. SSD, Сравнительные тесты дисковых подсистем.

Вот на ней же 1536 мегабайт, чтобы в кеши не влезало, в принципе мы видим реальную ситуацию с random writes.

Если что это RAID 10 из 4 дисков по 146гб 10k rpm.

Sequential reads: (g=0): rw=read, bs=4K-4K/4K-4K/4K-4K, ioengine=posixaio, iodepth=16
Random reads: (g=1): rw=randread, bs=4K-4K/4K-4K/4K-4K, ioengine=posixaio, iodepth=16
Sequential writes: (g=2): rw=write, bs=4K-4K/4K-4K/4K-4K, ioengine=posixaio, iodepth=16
Random writes: (g=3): rw=randwrite, bs=4K-4K/4K-4K/4K-4K, ioengine=posixaio, iodepth=16
fio-2.1.1
Starting 4 threads
Sequential reads: Laying out IO file(s) (1 file(s) / 1536MB)
Jobs: 1 (f=1): [___w] [97.3% done] [0KB/248KB/0KB /s] [0/62/0 iops] [eta 00m:23s]      
Sequential reads: (groupid=0, jobs=1): err= 0: pid=101280: Thu Oct 17 21:16:13 2013
  read : io=1536.0MB, bw=205603KB/s, iops=51400, runt=  7650msec
    slat (usec): min=1, max=157162, avg=15.03, stdev=440.70
    clat (usec): min=11, max=458218, avg=158.15, stdev=1662.10
     lat (usec): min=21, max=458221, avg=173.18, stdev=1721.49
    clat percentiles (usec):
     |  1.00th=[   13],  5.00th=[   26], 10.00th=[   35], 20.00th=[   54],
     | 30.00th=[   72], 40.00th=[   92], 50.00th=[  110], 60.00th=[  131],
     | 70.00th=[  155], 80.00th=[  183], 90.00th=[  221], 95.00th=[  278],
     | 99.00th=[  564], 99.50th=[  964], 99.90th=[ 4048], 99.95th=[11456],
     | 99.99th=[85504]
    bw (KB  /s): min=27033, max=354312, per=99.56%, avg=204698.73, stdev=96811.42
    lat (usec) : 20=4.07%, 50=13.24%, 100=26.85%, 250=49.22%, 500=5.40%
    lat (usec) : 750=0.55%, 1000=0.19%
    lat (msec) : 2=0.28%, 4=0.10%, 10=0.04%, 20=0.03%, 50=0.02%
    lat (msec) : 100=0.01%, 250=0.01%, 500=0.01%
  cpu          : usr=7.77%, sys=33.14%, ctx=273751, majf=0, minf=0
  IO depths    : 1=3.9%, 2=11.2%, 4=26.0%, 8=52.3%, 16=6.6%, 32=0.0%, >=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=93.9%, 8=0.1%, 16=6.1%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued    : total=r=393216/w=0/d=0, short=r=0/w=0/d=0
Random reads: (groupid=1, jobs=1): err= 0: pid=101280: Thu Oct 17 21:16:13 2013
  read : io=1536.0MB, bw=181666KB/s, iops=45416, runt=  8658msec
    slat (usec): min=2, max=1501.1K, avg=17.77, stdev=2403.34
    clat (usec): min=11, max=1502.3K, avg=163.63, stdev=4196.58
     lat (usec): min=23, max=1502.7K, avg=181.40, stdev=4836.62
    clat percentiles (usec):
     |  1.00th=[   14],  5.00th=[   30], 10.00th=[   41], 20.00th=[   60],
     | 30.00th=[   79], 40.00th=[   99], 50.00th=[  119], 60.00th=[  145],
     | 70.00th=[  173], 80.00th=[  217], 90.00th=[  270], 95.00th=[  334],
     | 99.00th=[  540], 99.50th=[  668], 99.90th=[ 1592], 99.95th=[ 2768],
     | 99.99th=[23680]
    bw (KB  /s): min= 8765, max=341208, per=100.00%, avg=208128.40, stdev=98893.63
    lat (usec) : 20=3.24%, 50=11.69%, 100=25.21%, 250=46.40%, 500=12.22%
    lat (usec) : 750=0.90%, 1000=0.16%
    lat (msec) : 2=0.11%, 4=0.05%, 10=0.02%, 50=0.01%, 100=0.01%
    lat (msec) : 250=0.01%, 2000=0.01%
  cpu          : usr=10.33%, sys=29.38%, ctx=226297, majf=0, minf=0
  IO depths    : 1=3.5%, 2=10.4%, 4=26.3%, 8=53.1%, 16=6.6%, 32=0.0%, >=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=93.8%, 8=0.1%, 16=6.2%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued    : total=r=393216/w=0/d=0, short=r=0/w=0/d=0
Sequential writes: (groupid=2, jobs=1): err= 0: pid=101280: Thu Oct 17 21:16:13 2013
  write: io=1536.0MB, bw=44670KB/s, iops=11167, runt= 35211msec
    slat (usec): min=1, max=644645, avg=36.35, stdev=1422.03
    clat (usec): min=9, max=6385.9K, avg=1127.88, stdev=44379.24
     lat (usec): min=25, max=6385.9K, avg=1164.23, stdev=44409.66
    clat percentiles (usec):
     |  1.00th=[   13],  5.00th=[   15], 10.00th=[   34], 20.00th=[   68],
     | 30.00th=[  102], 40.00th=[  129], 50.00th=[  161], 60.00th=[  193],
     | 70.00th=[  231], 80.00th=[  266], 90.00th=[  334], 95.00th=[  908],
     | 99.00th=[ 5536], 99.50th=[11200], 99.90th=[156672], 99.95th=[250880],
     | 99.99th=[1036288]
    bw (KB  /s): min=   36, max=216896, per=100.00%, avg=60334.73, stdev=58099.83
    lat (usec) : 10=0.01%, 20=5.50%, 50=7.39%, 100=16.51%, 250=46.05%
    lat (usec) : 500=17.50%, 750=1.44%, 1000=1.07%
    lat (msec) : 2=1.78%, 4=1.36%, 10=0.86%, 20=0.19%, 50=0.13%
    lat (msec) : 100=0.06%, 250=0.10%, 500=0.03%, 750=0.01%, 1000=0.01%
    lat (msec) : 2000=0.01%, >=2000=0.01%
  cpu          : usr=2.78%, sys=5.98%, ctx=346971, majf=0, minf=0
  IO depths    : 1=4.5%, 2=10.7%, 4=23.6%, 8=53.7%, 16=7.5%, 32=0.0%, >=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=93.8%, 8=0.2%, 16=6.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued    : total=r=0/w=393216/d=0, short=r=0/w=0/d=0
Random writes: (groupid=3, jobs=1): err= 0: pid=101214: Thu Oct 17 21:16:13 2013
  write: io=1536.0MB, bw=2062.6KB/s, iops=515, runt=762601msec
    slat (usec): min=1, max=580663, avg=159.66, stdev=2470.08
    clat (usec): min=6, max=4596.7K, avg=29807.89, stdev=218886.77
     lat (usec): min=23, max=4596.7K, avg=29967.56, stdev=218911.52
    clat percentiles (usec):
     |  1.00th=[   14],  5.00th=[   27], 10.00th=[   70], 20.00th=[  215],
     | 30.00th=[  350], 40.00th=[  490], 50.00th=[  636], 60.00th=[  812],
     | 70.00th=[ 1064], 80.00th=[ 1848], 90.00th=[20096], 95.00th=[104960],
     | 99.00th=[460800], 99.50th=[1433600], 99.90th=[3522560], 99.95th=[4046848],
     | 99.99th=[4423680]
    bw (KB  /s): min=    2, max=28717, per=100.00%, avg=3474.92, stdev=6039.38
    lat (usec) : 10=0.07%, 20=4.59%, 50=3.31%, 100=4.23%, 250=10.49%
    lat (usec) : 500=18.04%, 750=16.06%, 1000=11.35%
    lat (msec) : 2=12.62%, 4=3.98%, 10=3.16%, 20=2.09%, 50=2.62%
    lat (msec) : 100=2.20%, 250=3.16%, 500=1.09%, 750=0.24%, 1000=0.09%
    lat (msec) : 2000=0.19%, >=2000=0.41%
  cpu          : usr=0.19%, sys=0.31%, ctx=361515, majf=0, minf=0
  IO depths    : 1=4.6%, 2=10.2%, 4=22.6%, 8=53.7%, 16=8.9%, 32=0.0%, >=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=93.9%, 8=0.6%, 16=5.5%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued    : total=r=0/w=393216/d=0, short=r=0/w=0/d=0

Run status group 0 (all jobs):
   READ: io=1536.0MB, aggrb=205603KB/s, minb=205603KB/s, maxb=205603KB/s, mint=7650msec, maxt=7650msec

Run status group 1 (all jobs):
   READ: io=1536.0MB, aggrb=181665KB/s, minb=181665KB/s, maxb=181665KB/s, mint=8658msec, maxt=8658msec

Run status group 2 (all jobs):
  WRITE: io=1536.0MB, aggrb=44669KB/s, minb=44669KB/s, maxb=44669KB/s, mint=35211msec, maxt=35211msec

Run status group 3 (all jobs):
  WRITE: io=1536.0MB, aggrb=2062KB/s, minb=2062KB/s, maxb=2062KB/s, mint=762601msec, maxt=762601msec
SAS vs. SSD, Сравнительные тесты дисковых подсистем.
WapGraf:
ENELIS, FreeBSD 9.1-RELEASE

Тогда очень странно что write performance низкий настолько.

Вот данные на очень нагруженной системе (полностью, памяти тоже нет)

FreeBSD 8.2 zfs соответственно 15

Файл 256 мегабайт

Кеш райда 256 мегабайт...

конфиг простой zpool поверх hw raid 1

Sequential reads: (g=0): rw=read, bs=4K-4K/4K-4K/4K-4K, ioengine=posixaio, iodepth=16
Random reads: (g=1): rw=randread, bs=4K-4K/4K-4K/4K-4K, ioengine=posixaio, iodepth=16
Sequential writes: (g=2): rw=write, bs=4K-4K/4K-4K/4K-4K, ioengine=posixaio, iodepth=16
Random writes: (g=3): rw=randwrite, bs=4K-4K/4K-4K/4K-4K, ioengine=posixaio, iodepth=16
fio-2.1.1
Starting 4 threads
Sequential reads: Laying out IO file(s) (1 file(s) / 256MB)
Jobs: 1 (f=1): [___w] [62.5% done] [0KB/181.7MB/0KB /s] [0/46.5K/0 iops] [eta 00m:03s]       
Sequential reads: (groupid=0, jobs=1): err= 0: pid=101280: Thu Oct 17 20:54:23 2013
  read : io=262144KB, bw=243628KB/s, iops=60907, runt=  1076msec
    slat (usec): min=1, max=487, avg=11.85, stdev= 8.21
    clat (usec): min=11, max=1343, avg=132.11, stdev=83.53
     lat (usec): min=22, max=1354, avg=143.96, stdev=84.57
    clat percentiles (usec):
     |  1.00th=[   13],  5.00th=[   18], 10.00th=[   31], 20.00th=[   54],
     | 30.00th=[   78], 40.00th=[  103], 50.00th=[  126], 60.00th=[  149],
     | 70.00th=[  173], 80.00th=[  197], 90.00th=[  227], 95.00th=[  266],
     | 99.00th=[  386], 99.50th=[  446], 99.90th=[  620], 99.95th=[  740],
     | 99.99th=[ 1112]
    bw (KB  /s): min=243080, max=247984, per=100.00%, avg=245532.00, stdev=3467.65
    lat (usec) : 20=5.18%, 50=11.39%, 100=22.02%, 250=54.82%, 500=6.29%
    lat (usec) : 750=0.24%, 1000=0.03%
    lat (msec) : 2=0.02%
  cpu          : usr=18.79%, sys=27.81%, ctx=63115, majf=0, minf=0
  IO depths    : 1=5.8%, 2=12.4%, 4=25.1%, 8=50.3%, 16=6.3%, 32=0.0%, >=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=94.1%, 8=0.0%, 16=5.9%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued    : total=r=65536/w=0/d=0, short=r=0/w=0/d=0
Random reads: (groupid=1, jobs=1): err= 0: pid=101280: Thu Oct 17 20:54:23 2013
  read : io=262144KB, bw=303407KB/s, iops=75851, runt=   864msec
    slat (usec): min=1, max=518, avg= 9.25, stdev= 9.01
    clat (usec): min=13, max=760, avg=114.40, stdev=70.25
     lat (usec): min=23, max=766, avg=123.64, stdev=71.98
    clat percentiles (usec):
     |  1.00th=[   14],  5.00th=[   29], 10.00th=[   39], 20.00th=[   55],
     | 30.00th=[   70], 40.00th=[   86], 50.00th=[  102], 60.00th=[  117],
     | 70.00th=[  137], 80.00th=[  163], 90.00th=[  211], 95.00th=[  247],
     | 99.00th=[  334], 99.50th=[  386], 99.90th=[  506], 99.95th=[  548],
     | 99.99th=[  652]
    bw (KB  /s): min=366632, max=366632, per=100.00%, avg=366632.00, stdev= 0.00
    lat (usec) : 20=2.11%, 50=14.53%, 100=31.94%, 250=46.84%, 500=4.47%
    lat (usec) : 750=0.11%, 1000=0.01%
  cpu          : usr=20.86%, sys=46.81%, ctx=24847, majf=0, minf=0
  IO depths    : 1=2.3%, 2=10.7%, 4=26.7%, 8=53.6%, 16=6.7%, 32=0.0%, >=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=93.7%, 8=0.1%, 16=6.3%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued    : total=r=65536/w=0/d=0, short=r=0/w=0/d=0
Sequential writes: (groupid=2, jobs=1): err= 0: pid=101280: Thu Oct 17 20:54:23 2013
  write: io=262144KB, bw=237020KB/s, iops=59254, runt=  1106msec
    slat (usec): min=1, max=908, avg=13.16, stdev=15.95
    clat (usec): min=13, max=1480, avg=150.96, stdev=89.10
     lat (usec): min=28, max=1484, avg=164.12, stdev=89.89
    clat percentiles (usec):
     |  1.00th=[   14],  5.00th=[   35], 10.00th=[   53], 20.00th=[   74],
     | 30.00th=[   94], 40.00th=[  114], 50.00th=[  137], 60.00th=[  159],
     | 70.00th=[  185], 80.00th=[  223], 90.00th=[  274], 95.00th=[  310],
     | 99.00th=[  402], 99.50th=[  454], 99.90th=[  612], 99.95th=[  732],
     | 99.99th=[ 1208]
    bw (KB  /s): min=231568, max=246096, per=100.00%, avg=238832.00, stdev=10272.85
    lat (usec) : 20=2.67%, 50=5.47%, 100=24.73%, 250=52.82%, 500=14.00%
    lat (usec) : 750=0.26%, 1000=0.03%
    lat (msec) : 2=0.02%
  cpu          : usr=18.46%, sys=37.01%, ctx=28379, majf=0, minf=0
  IO depths    : 1=2.9%, 2=7.3%, 4=24.9%, 8=57.6%, 16=7.3%, 32=0.0%, >=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=93.3%, 8=0.2%, 16=6.6%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued    : total=r=0/w=65536/d=0, short=r=0/w=0/d=0
Random writes: (groupid=3, jobs=1): err= 0: pid=101280: Thu Oct 17 20:54:23 2013
  write: io=262144KB, bw=233848KB/s, iops=58462, runt=  1121msec
    slat (usec): min=2, max=935, avg=13.31, stdev=15.23
    clat (usec): min=13, max=1339, avg=150.84, stdev=90.10
     lat (usec): min=27, max=1344, avg=164.15, stdev=91.05
    clat percentiles (usec):
     |  1.00th=[   14],  5.00th=[   34], 10.00th=[   53], 20.00th=[   73],
     | 30.00th=[   93], 40.00th=[  113], 50.00th=[  137], 60.00th=[  159],
     | 70.00th=[  187], 80.00th=[  227], 90.00th=[  282], 95.00th=[  314],
     | 99.00th=[  378], 99.50th=[  422], 99.90th=[  588], 99.95th=[  780],
     | 99.99th=[ 1304]
    bw (KB  /s): min=231504, max=233392, per=99.40%, avg=232448.00, stdev=1335.02
    lat (usec) : 20=2.96%, 50=5.53%, 100=25.32%, 250=50.78%, 500=15.20%
    lat (usec) : 750=0.16%, 1000=0.02%
    lat (msec) : 2=0.04%
  cpu          : usr=9.38%, sys=44.29%, ctx=30635, majf=0, minf=0
  IO depths    : 1=3.1%, 2=7.3%, 4=24.9%, 8=57.5%, 16=7.2%, 32=0.0%, >=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=93.3%, 8=0.2%, 16=6.6%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued    : total=r=0/w=65536/d=0, short=r=0/w=0/d=0

Run status group 0 (all jobs):
   READ: io=262144KB, aggrb=243628KB/s, minb=243628KB/s, maxb=243628KB/s, mint=1076msec, maxt=1076msec

Run status group 1 (all jobs):
   READ: io=262144KB, aggrb=303407KB/s, minb=303407KB/s, maxb=303407KB/s, mint=864msec, maxt=864msec

Run status group 2 (all jobs):
  WRITE: io=262144KB, aggrb=237019KB/s, minb=237019KB/s, maxb=237019KB/s, mint=1106msec, maxt=1106msec

Run status group 3 (all jobs):
  WRITE: io=262144KB, aggrb=233848KB/s, minb=233848KB/s, maxb=233848KB/s, mint=1121msec, maxt=1121msec
SAS vs. SSD, Сравнительные тесты дисковых подсистем.
WapGraf:
Поправил пост выше.

А какая BSD? Там была куча исправлений в 8 и 9ой версии.

SAS vs. SSD, Сравнительные тесты дисковых подсистем.
WapGraf:
Да и файловая система zfs себя чуть по другому ведет.

2x SAS HW RAID1

Эти же диски на линуксе:


Up: немного соврал, на zfs 3x SAS

Это на линуксе был zfs или в BSD?

Я ARC обошел выбрав файл 1536 мегабайт, т.к. в ARC уже не было места и памяти тоже не было.

И система нагружена mysqlом и ядреными perl скриптами с 100-200 запросов в страничке.

Поправим пул позже посмотрим еще раз, т.к. в DEGRADED падает производительность заметно на запись и чтение.

---------- Добавлено 17.10.2013 в 17:54 ----------

Вот тест такого же пула (идентичная копия), только сейчас он забит чуть менее чем полностью, сервер в свапе на 1 процент и под постоянной нагрузкой la 8 на 8 тредовом сервере.

Вот его стандартная нагрузка


last pid: 39740;  load averages:  7.59,  8.82,  7.35                                                                                                                                                                                                 up 20+02:57:08  19:53:17
51 processes:  4 running, 46 sleeping, 1 zombie
CPU: 37.5% user,  0.0% nice, 11.6% system,  0.4% interrupt, 50.5% idle
Mem: 219M Active, 1072M Inact, 5536M Wired, 194M Cache, 853M Free
ARC: 3702M Total, 1945M MFU, 1177M MRU, 10M Anon, 90M Header, 480M Other
Swap: 8192M Total, 143M Used, 8049M Free, 1% Inuse


  pool: fd
 state: ONLINE
  scan: none requested
config:

	NAME                                            STATE     READ WRITE CKSUM
	fd                                             ONLINE       0     0     0
	  mirror-0                                      ONLINE       0     0     0
	    gptid/58b4bfaf-141e-11e3-8b5a-00259097e6e2  ONLINE       0     0     0
	    gptid/557f3637-141e-11e3-8b5a-00259097e6e2  ONLINE       0     0     0

errors: No known data errors

Во время теста нагрузка выросла в 2 раза

Sequential reads: (g=0): rw=read, bs=4K-4K/4K-4K/4K-4K, ioengine=posixaio, iodepth=16
Random reads: (g=1): rw=randread, bs=4K-4K/4K-4K/4K-4K, ioengine=posixaio, iodepth=16
Sequential writes: (g=2): rw=write, bs=4K-4K/4K-4K/4K-4K, ioengine=posixaio, iodepth=16
Random writes: (g=3): rw=randwrite, bs=4K-4K/4K-4K/4K-4K, ioengine=posixaio, iodepth=16
fio-2.1.1
Starting 4 threads
Sequential reads: Laying out IO file(s) (1 file(s) / 1536MB)
Jobs: 1 (f=1): [___w] [100.0% done] [0KB/40414KB/0KB /s] [0/10.2K/0 iops] [eta 00m:00s]
Sequential reads: (groupid=0, jobs=1): err= 0: pid=102785: Thu Oct 17 19:49:50 2013
  read : io=1536.0MB, bw=131941KB/s, iops=32985, runt= 11921msec
    slat (usec): min=0, max=181386, avg=17.78, stdev=770.91
    clat (usec): min=5, max=870244, avg=316.33, stdev=7370.62
     lat (usec): min=11, max=870254, avg=334.11, stdev=7411.51
    clat percentiles (usec):
     |  1.00th=[   10],  5.00th=[   13], 10.00th=[   20], 20.00th=[   29],
     | 30.00th=[   38], 40.00th=[   51], 50.00th=[   66], 60.00th=[   84],
     | 70.00th=[  104], 80.00th=[  126], 90.00th=[  151], 95.00th=[  169],
     | 99.00th=[ 1880], 99.50th=[ 6560], 99.90th=[43776], 99.95th=[82432],
     | 99.99th=[317440]
    bw (KB  /s): min=10017, max=336712, per=97.62%, avg=128799.90, stdev=81324.43
    lat (usec) : 10=0.49%, 20=9.32%, 50=29.15%, 100=28.84%, 250=30.07%
    lat (usec) : 500=0.61%, 750=0.26%, 1000=0.09%
    lat (msec) : 2=0.19%, 4=0.33%, 10=0.29%, 20=0.15%, 50=0.13%
    lat (msec) : 100=0.04%, 250=0.03%, 500=0.01%, 1000=0.01%
  cpu          : usr=5.81%, sys=9.51%, ctx=313519, majf=1, minf=0
  IO depths    : 1=4.3%, 2=10.8%, 4=24.7%, 8=53.4%, 16=6.8%, 32=0.0%, >=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=93.7%, 8=0.3%, 16=6.1%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued    : total=r=393216/w=0/d=0, short=r=0/w=0/d=0
Random reads: (groupid=1, jobs=1): err= 0: pid=101044: Thu Oct 17 19:49:50 2013
  read : io=1536.0MB, bw=178572KB/s, iops=44643, runt=  8808msec
    slat (usec): min=0, max=56156, avg=10.10, stdev=150.53
    clat (usec): min=4, max=318976, avg=272.95, stdev=1893.59
     lat (usec): min=7, max=318978, avg=283.05, stdev=1901.16
    clat percentiles (usec):
     |  1.00th=[    7],  5.00th=[   11], 10.00th=[   14], 20.00th=[   23],
     | 30.00th=[   35], 40.00th=[   49], 50.00th=[   67], 60.00th=[   88],
     | 70.00th=[  114], 80.00th=[  143], 90.00th=[  181], 95.00th=[  231],
     | 99.00th=[ 5024], 99.50th=[ 8096], 99.90th=[21632], 99.95th=[33024],
     | 99.99th=[60160]
    bw (KB  /s): min=20024, max=421488, per=100.00%, avg=178736.35, stdev=136780.57
    lat (usec) : 10=2.57%, 20=12.55%, 50=24.99%, 100=24.47%, 250=30.82%
    lat (usec) : 500=1.03%, 750=0.28%, 1000=0.13%
    lat (msec) : 2=0.28%, 4=1.32%, 10=1.19%, 20=0.26%, 50=0.10%
    lat (msec) : 100=0.02%, 250=0.01%, 500=0.01%
  cpu          : usr=10.04%, sys=15.41%, ctx=323551, majf=0, minf=0
  IO depths    : 1=2.5%, 2=7.5%, 4=18.7%, 8=56.0%, 16=15.3%, 32=0.0%, >=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=94.3%, 8=1.1%, 16=4.6%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued    : total=r=393216/w=0/d=0, short=r=0/w=0/d=0
Sequential writes: (groupid=2, jobs=1): err= 0: pid=101856: Thu Oct 17 19:49:50 2013
  write: io=1536.0MB, bw=162469KB/s, iops=40617, runt=  9681msec
    slat (usec): min=0, max=23439, avg= 4.54, stdev=40.53
    clat (usec): min=6, max=1132.1K, avg=356.47, stdev=6989.74
     lat (usec): min=14, max=1132.1K, avg=361.01, stdev=6989.93
    clat percentiles (usec):
     |  1.00th=[   17],  5.00th=[   24], 10.00th=[   29], 20.00th=[   35],
     | 30.00th=[   43], 40.00th=[   51], 50.00th=[   61], 60.00th=[   75],
     | 70.00th=[   99], 80.00th=[  474], 90.00th=[  612], 95.00th=[  804],
     | 99.00th=[ 4512], 99.50th=[ 6624], 99.90th=[20864], 99.95th=[31616],
     | 99.99th=[70144]
    bw (KB  /s): min=30288, max=352504, per=100.00%, avg=169479.35, stdev=97958.20
    lat (usec) : 10=0.07%, 20=2.18%, 50=35.88%, 100=31.90%, 250=8.56%
    lat (usec) : 500=2.25%, 750=13.42%, 1000=2.53%
    lat (msec) : 2=1.16%, 4=0.90%, 10=0.88%, 20=0.16%, 50=0.09%
    lat (msec) : 100=0.01%, 250=0.01%, 1000=0.01%, 2000=0.01%
  cpu          : usr=5.52%, sys=12.96%, ctx=137201, majf=0, minf=0
  IO depths    : 1=0.3%, 2=4.9%, 4=19.7%, 8=62.4%, 16=12.6%, 32=0.0%, >=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=93.3%, 8=1.6%, 16=5.1%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued    : total=r=0/w=393216/d=0, short=r=0/w=0/d=0
Random writes: (groupid=3, jobs=1): err= 0: pid=100163: Thu Oct 17 19:49:50 2013
  write: io=1536.0MB, bw=9098.4KB/s, iops=2274, runt=172874msec
    slat (usec): min=0, max=166956, avg= 6.89, stdev=510.56
    clat (usec): min=6, max=2331.7K, avg=6994.06, stdev=38807.83
     lat (usec): min=12, max=2331.7K, avg=7000.95, stdev=38815.75
    clat percentiles (usec):
     |  1.00th=[   20],  5.00th=[   31], 10.00th=[   45], 20.00th=[   85],
     | 30.00th=[  147], 40.00th=[  270], 50.00th=[  796], 60.00th=[ 2512],
     | 70.00th=[ 4128], 80.00th=[ 5792], 90.00th=[ 9920], 95.00th=[22144],
     | 99.00th=[91648], 99.50th=[183296], 99.90th=[651264], 99.95th=[765952],
     | 99.99th=[1003520]
    bw (KB  /s): min=   80, max=67072, per=100.00%, avg=9450.67, stdev=7550.18
    lat (usec) : 10=0.01%, 20=0.88%, 50=10.60%, 100=11.35%, 250=15.95%
    lat (usec) : 500=8.03%, 750=2.81%, 1000=2.87%
    lat (msec) : 2=5.13%, 4=11.46%, 10=21.06%, 20=4.35%, 50=3.45%
    lat (msec) : 100=1.15%, 250=0.56%, 500=0.21%, 750=0.09%, 1000=0.05%
    lat (msec) : 2000=0.01%, >=2000=0.01%
  cpu          : usr=0.82%, sys=1.43%, ctx=377431, majf=0, minf=0
  IO depths    : 1=0.1%, 2=0.6%, 4=3.0%, 8=55.4%, 16=40.8%, 32=0.0%, >=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=96.7%, 8=2.4%, 16=0.9%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued    : total=r=0/w=393216/d=0, short=r=0/w=0/d=0

Run status group 0 (all jobs):
   READ: io=1536.0MB, aggrb=131940KB/s, minb=131940KB/s, maxb=131940KB/s, mint=11921msec, maxt=11921msec

Run status group 1 (all jobs):
   READ: io=1536.0MB, aggrb=178572KB/s, minb=178572KB/s, maxb=178572KB/s, mint=8808msec, maxt=8808msec

Run status group 2 (all jobs):
  WRITE: io=1536.0MB, aggrb=162469KB/s, minb=162469KB/s, maxb=162469KB/s, mint=9681msec, maxt=9681msec

Run status group 3 (all jobs):
  WRITE: io=1536.0MB, aggrb=9098KB/s, minb=9098KB/s, maxb=9098KB/s, mint=172874msec, maxt=172874msec


---------- Добавлено 17.10.2013 в 17:59 ----------

Еще забыл добавить

Оба тестируемые пулы с dedup=on,compression=lz4,checksum=fletcher4

SAS vs. SSD, Сравнительные тесты дисковых подсистем.
WapGraf:
ENELIS, а диск какой?

Kingston SSD 120GB V300

SAS vs. SSD, Сравнительные тесты дисковых подсистем.

Небольшой тест на неравномерно нагруженной системе

Оказывается:

pool: fd

state: DEGRADED

status: One or more devices has been removed by the administrator.

Sufficient replicas exist for the pool to continue functioning in a

degraded state.

action: Online the device using 'zpool online' or replace the device with

'zpool replace'.

scan: none requested

config:

NAME STATE READ WRITE CKSUM

fd DEGRADED 0 0 0

mirror-0 DEGRADED 0 0 0

gpt/disk0 ONLINE 0 0 0

1934153058 REMOVED 0 0 0 was /dev/gpt/disk1

errors: No known data errors

zpool DEGRADED

диск только один, второй отвалился

Но давайте чуть увеличим до 1536 мегабайт

Sequential reads: (g=0): rw=read, bs=4K-4K/4K-4K/4K-4K, ioengine=posixaio, iodepth=16
Random reads: (g=1): rw=randread, bs=4K-4K/4K-4K/4K-4K, ioengine=posixaio, iodepth=16
Sequential writes: (g=2): rw=write, bs=4K-4K/4K-4K/4K-4K, ioengine=posixaio, iodepth=16
Random writes: (g=3): rw=randwrite, bs=4K-4K/4K-4K/4K-4K, ioengine=posixaio, iodepth=16
fio-2.1.1
Starting 4 threads
Sequential reads: Laying out IO file(s) (1 file(s) / 1536MB)
Jobs: 1 (f=1): [___w] [99.4% done] [0KB/14585KB/0KB /s] [0/3646/0 iops] [eta 00m:03s]  
Sequential reads: (groupid=0, jobs=1): err= 0: pid=101006: Thu Oct 17 18:47:19 2013
  read : io=1536.0MB, bw=1761.5MB/s, iops=450935, runt=   872msec
    slat (usec): min=0, max=439, avg= 1.38, stdev= 1.02
    clat (usec): min=8, max=701, avg=23.11, stdev= 9.59
     lat (usec): min=9, max=702, avg=24.49, stdev= 9.61
    clat percentiles (usec):
     |  1.00th=[   10],  5.00th=[   11], 10.00th=[   13], 20.00th=[   15],
     | 30.00th=[   17], 40.00th=[   20], 50.00th=[   22], 60.00th=[   24],
     | 70.00th=[   26], 80.00th=[   29], 90.00th=[   38], 95.00th=[   40],
     | 99.00th=[   44], 99.50th=[   47], 99.90th=[   56], 99.95th=[   62],
     | 99.99th=[  145]
    bw (MB  /s): min= 1758, max= 1758, per=99.85%, avg=1758.91, stdev= 0.00
    lat (usec) : 10=0.24%, 20=39.35%, 50=60.12%, 100=0.27%, 250=0.02%
    lat (usec) : 500=0.01%, 750=0.01%
  cpu          : usr=16.07%, sys=83.58%, ctx=475, majf=0, minf=0
  IO depths    : 1=0.1%, 2=7.1%, 4=28.5%, 8=57.2%, 16=7.2%, 32=0.0%, >=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=93.3%, 8=0.1%, 16=6.7%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued    : total=r=393216/w=0/d=0, short=r=0/w=0/d=0
Random reads: (groupid=1, jobs=1): err= 0: pid=101032: Thu Oct 17 18:47:19 2013
  read : io=1536.0MB, bw=634731KB/s, iops=158682, runt=  2478msec
    slat (usec): min=0, max=7426, avg= 4.51, stdev=15.39
    clat (usec): min=8, max=11078, avg=57.39, stdev=97.06
     lat (usec): min=11, max=11080, avg=61.90, stdev=100.13
    clat percentiles (usec):
     |  1.00th=[   12],  5.00th=[   15], 10.00th=[   18], 20.00th=[   23],
     | 30.00th=[   27], 40.00th=[   32], 50.00th=[   38], 60.00th=[   45],
     | 70.00th=[   55], 80.00th=[   72], 90.00th=[  115], 95.00th=[  179],
     | 99.00th=[  294], 99.50th=[  334], 99.90th=[  426], 99.95th=[  516],
     | 99.99th=[ 3888]
    bw (KB  /s): min=254016, max=1024184, per=87.32%, avg=554270.00, stdev=349118.42
    lat (usec) : 10=0.02%, 20=13.30%, 50=51.40%, 100=22.80%, 250=10.44%
    lat (usec) : 500=2.00%, 750=0.02%, 1000=0.01%
    lat (msec) : 2=0.01%, 4=0.01%, 10=0.01%, 20=0.01%
  cpu          : usr=26.36%, sys=36.21%, ctx=106755, majf=0, minf=0
  IO depths    : 1=0.9%, 2=5.9%, 4=27.6%, 8=58.3%, 16=7.3%, 32=0.0%, >=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=93.2%, 8=0.1%, 16=6.8%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued    : total=r=393216/w=0/d=0, short=r=0/w=0/d=0
Sequential writes: (groupid=2, jobs=1): err= 0: pid=101422: Thu Oct 17 18:47:19 2013
  write: io=1536.0MB, bw=253402KB/s, iops=63350, runt=  6207msec
    slat (usec): min=0, max=12557, avg= 2.44, stdev=30.18
    clat (usec): min=8, max=192112, avg=233.52, stdev=1854.71
     lat (usec): min=9, max=192117, avg=235.96, stdev=1855.05
    clat percentiles (usec):
     |  1.00th=[   17],  5.00th=[   21], 10.00th=[   23], 20.00th=[   27],
     | 30.00th=[   30], 40.00th=[   33], 50.00th=[   37], 60.00th=[   42],
     | 70.00th=[   50], 80.00th=[   56], 90.00th=[   68], 95.00th=[  996],
     | 99.00th=[ 3984], 99.50th=[ 5984], 99.90th=[11968], 99.95th=[15040],
     | 99.99th=[30080]
    bw (KB  /s): min=23256, max=505528, per=93.47%, avg=236857.92, stdev=169635.96
    lat (usec) : 10=0.01%, 20=3.15%, 50=66.19%, 100=22.66%, 250=0.74%
    lat (usec) : 500=0.15%, 750=0.01%, 1000=2.42%
    lat (msec) : 2=2.13%, 4=1.61%, 10=0.79%, 20=0.12%, 50=0.01%
    lat (msec) : 250=0.01%
  cpu          : usr=7.40%, sys=15.45%, ctx=44731, majf=0, minf=0
  IO depths    : 1=0.1%, 2=1.4%, 4=24.6%, 8=64.6%, 16=9.3%, 32=0.0%, >=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=92.4%, 8=0.9%, 16=6.7%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued    : total=r=0/w=393216/d=0, short=r=0/w=0/d=0
Random writes: (groupid=3, jobs=1): err= 0: pid=102612: Thu Oct 17 18:47:19 2013
  write: io=1536.0MB, bw=3241.4KB/s, iops=810, runt=485244msec
    slat (usec): min=0, max=4157, avg= 2.04, stdev=11.65
    clat (usec): min=9, max=1633.2K, avg=19722.59, stdev=136467.97
     lat (usec): min=10, max=1633.3K, avg=19724.63, stdev=136468.03
    clat percentiles (usec):
     |  1.00th=[   29],  5.00th=[   41], 10.00th=[   52], 20.00th=[   97],
     | 30.00th=[  159], 40.00th=[  203], 50.00th=[  255], 60.00th=[  330],
     | 70.00th=[  466], 80.00th=[  980], 90.00th=[ 2960], 95.00th=[ 6560],
     | 99.00th=[970752], 99.50th=[1073152], 99.90th=[1253376], 99.95th=[1335296],
     | 99.99th=[1564672]
    bw (KB  /s): min= 1544, max=16235, per=100.00%, avg=3291.87, stdev=1092.16
    lat (usec) : 10=0.01%, 20=0.11%, 50=8.93%, 100=11.27%, 250=28.78%
    lat (usec) : 500=22.39%, 750=5.51%, 1000=4.68%
    lat (msec) : 2=6.06%, 4=5.08%, 10=3.51%, 20=1.24%, 50=0.45%
    lat (msec) : 100=0.08%, 250=0.01%, 500=0.01%, 750=0.11%, 1000=0.95%
    lat (msec) : 2000=0.83%
  cpu          : usr=0.18%, sys=0.25%, ctx=38177, majf=0, minf=0
  IO depths    : 1=1.6%, 2=5.8%, 4=16.0%, 8=58.0%, 16=18.6%, 32=0.0%, >=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=94.4%, 8=1.8%, 16=3.8%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued    : total=r=0/w=393216/d=0, short=r=0/w=0/d=0

Run status group 0 (all jobs):
   READ: io=1536.0MB, aggrb=1761.5MB/s, minb=1761.5MB/s, maxb=1761.5MB/s, mint=872msec, maxt=872msec

Run status group 1 (all jobs):
   READ: io=1536.0MB, aggrb=634731KB/s, minb=634731KB/s, maxb=634731KB/s, mint=2478msec, maxt=2478msec

Run status group 2 (all jobs):
  WRITE: io=1536.0MB, aggrb=253401KB/s, minb=253401KB/s, maxb=253401KB/s, mint=6207msec, maxt=6207msec

Run status group 3 (all jobs):
  WRITE: io=1536.0MB, aggrb=3241KB/s, minb=3241KB/s, maxb=3241KB/s, mint=485244msec, maxt=485244msec
SAS vs. SSD, Сравнительные тесты дисковых подсистем.

Небольшой тест на неравномерно нагруженной системе

FreeBSD *.azar-a.net 9.2-RC4 FreeBSD 9.2-RC4 #0 r+750678a-dirty: Thu Sep 26 15:19:27 MSK 2013 root@*.azar-a.net:/usr/obj/usr/src/sys/RACT amd64

ZFS zpool v28-ext zfs v5

[global]
bs=4k
size=256M
filename=test.file
direct=1
buffered=0
ioengine=posixaio
iodepth=16
thread

[seq-read]
rw=read
stonewall
name=Sequential reads

[rand-read]
rw=randread
stonewall
name=Random reads

[seq-write]
rw=write
stonewall
name=Sequential writes

[rand-write]
rw=randwrite
stonewall
name=Random writes

Результаты

Sequential reads: (g=0): rw=read, bs=4K-4K/4K-4K/4K-4K, ioengine=posixaio, iodepth=16
Random reads: (g=1): rw=randread, bs=4K-4K/4K-4K/4K-4K, ioengine=posixaio, iodepth=16
Sequential writes: (g=2): rw=write, bs=4K-4K/4K-4K/4K-4K, ioengine=posixaio, iodepth=16
Random writes: (g=3): rw=randwrite, bs=4K-4K/4K-4K/4K-4K, ioengine=posixaio, iodepth=16
fio-2.1.1
Starting 4 threads
Jobs: 1 (f=1)
Sequential reads: (groupid=0, jobs=1): err= 0: pid=102596: Thu Oct 17 18:28:01 2013
  read : io=262144KB, bw=1662.4MB/s, iops=425558, runt=   154msec
    slat (usec): min=0, max=10, avg= 1.44, stdev= 0.57
    clat (usec): min=9, max=109, avg=24.43, stdev= 9.44
     lat (usec): min=10, max=111, avg=25.87, stdev= 9.42
    clat percentiles (usec):
     |  1.00th=[   11],  5.00th=[   12], 10.00th=[   13], 20.00th=[   16],
     | 30.00th=[   18], 40.00th=[   21], 50.00th=[   23], 60.00th=[   25],
     | 70.00th=[   28], 80.00th=[   32], 90.00th=[   39], 95.00th=[   41],
     | 99.00th=[   50], 99.50th=[   52], 99.90th=[   59], 99.95th=[   61],
     | 99.99th=[   77]
    lat (usec) : 10=0.08%, 20=34.91%, 50=63.98%, 100=1.03%, 250=0.01%
  cpu          : usr=14.38%, sys=84.31%, ctx=189, majf=0, minf=0
  IO depths    : 1=0.1%, 2=6.3%, 4=28.7%, 8=57.7%, 16=7.2%, 32=0.0%, >=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=93.3%, 8=0.1%, 16=6.7%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued    : total=r=65536/w=0/d=0, short=r=0/w=0/d=0
Random reads: (groupid=1, jobs=1): err= 0: pid=101018: Thu Oct 17 18:28:01 2013
  read : io=262144KB, bw=1560.1MB/s, iops=399609, runt=   164msec
    slat (usec): min=0, max=39, avg= 1.43, stdev= 0.59
    clat (usec): min=9, max=111, avg=26.61, stdev=11.19
     lat (usec): min=10, max=112, avg=28.04, stdev=11.18
    clat percentiles (usec):
     |  1.00th=[   11],  5.00th=[   13], 10.00th=[   14], 20.00th=[   17],
     | 30.00th=[   19], 40.00th=[   22], 50.00th=[   25], 60.00th=[   27],
     | 70.00th=[   30], 80.00th=[   37], 90.00th=[   43], 95.00th=[   47],
     | 99.00th=[   59], 99.50th=[   66], 99.90th=[   82], 99.95th=[   86],
     | 99.99th=[   98]
    lat (usec) : 10=0.02%, 20=30.17%, 50=66.63%, 100=3.16%, 250=0.01%
  cpu          : usr=19.63%, sys=79.75%, ctx=233, majf=0, minf=0
  IO depths    : 1=0.1%, 2=3.5%, 4=28.3%, 8=60.6%, 16=7.6%, 32=0.0%, >=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=93.0%, 8=0.0%, 16=7.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued    : total=r=65536/w=0/d=0, short=r=0/w=0/d=0
Sequential writes: (groupid=2, jobs=1): err= 0: pid=100883: Thu Oct 17 18:28:01 2013
  write: io=262144KB, bw=1213.3MB/s, iops=310597, runt=   211msec
    slat (usec): min=0, max=24, avg= 1.97, stdev= 1.15
    clat (usec): min=12, max=73, avg=36.24, stdev=11.75
     lat (usec): min=15, max=75, avg=38.21, stdev=11.77
    clat percentiles (usec):
     |  1.00th=[   16],  5.00th=[   20], 10.00th=[   23], 20.00th=[   26],
     | 30.00th=[   29], 40.00th=[   31], 50.00th=[   34], 60.00th=[   36],
     | 70.00th=[   40], 80.00th=[   50], 90.00th=[   55], 95.00th=[   57],
     | 99.00th=[   61], 99.50th=[   63], 99.90th=[   66], 99.95th=[   66],
     | 99.99th=[   69]
    lat (usec) : 20=3.94%, 50=75.29%, 100=20.77%
  cpu          : usr=36.67%, sys=59.05%, ctx=5050, majf=0, minf=0
  IO depths    : 1=0.1%, 2=1.5%, 4=27.3%, 8=63.3%, 16=7.9%, 32=0.0%, >=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=92.7%, 8=0.0%, 16=7.3%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued    : total=r=0/w=65536/d=0, short=r=0/w=0/d=0
Random writes: (groupid=3, jobs=1): err= 0: pid=102595: Thu Oct 17 18:28:01 2013
  write: io=262144KB, bw=1024.0MB/s, iops=262144, runt=   250msec
    slat (usec): min=0, max=334, avg= 2.21, stdev= 5.13
    clat (usec): min=9, max=2146, avg=43.55, stdev=49.80
     lat (usec): min=13, max=2149, avg=45.77, stdev=50.71
    clat percentiles (usec):
     |  1.00th=[   17],  5.00th=[   20], 10.00th=[   22], 20.00th=[   26],
     | 30.00th=[   29], 40.00th=[   32], 50.00th=[   34], 60.00th=[   37],
     | 70.00th=[   45], 80.00th=[   52], 90.00th=[   57], 95.00th=[   65],
     | 99.00th=[  262], 99.50th=[  358], 99.90th=[  588], 99.95th=[  740],
     | 99.99th=[ 1512]
    lat (usec) : 10=0.01%, 20=4.33%, 50=70.12%, 100=22.33%, 250=2.09%
    lat (usec) : 500=0.96%, 750=0.13%, 1000=0.02%
    lat (msec) : 2=0.03%, 4=0.01%
  cpu          : usr=21.69%, sys=65.46%, ctx=3807, majf=0, minf=0
  IO depths    : 1=0.1%, 2=1.1%, 4=26.5%, 8=64.2%, 16=8.2%, 32=0.0%, >=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=92.6%, 8=0.1%, 16=7.3%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued    : total=r=0/w=65536/d=0, short=r=0/w=0/d=0

Run status group 0 (all jobs):
   READ: io=262144KB, aggrb=1662.4MB/s, minb=1662.4MB/s, maxb=1662.4MB/s, mint=154msec, maxt=154msec

Run status group 1 (all jobs):
   READ: io=262144KB, aggrb=1560.1MB/s, minb=1560.1MB/s, maxb=1560.1MB/s, mint=164msec, maxt=164msec

Run status group 2 (all jobs):
  WRITE: io=262144KB, aggrb=1213.3MB/s, minb=1213.3MB/s, maxb=1213.3MB/s, mint=211msec, maxt=211msec

Run status group 3 (all jobs):
  WRITE: io=262144KB, aggrb=1024.0MB/s, minb=1024.0MB/s, maxb=1024.0MB/s, mint=250msec, maxt=250msec
SAS vs. SSD, Сравнительные тесты дисковых подсистем.

near-line sas это диск sata с плюшками SAS (то есть и очередь 256 там тоже)

А так в SAS порт можно и sata воткнуть.

Это Вам не scsi vs ide

eServer.ru прикольно отожгли, стоит знать тонкости их работы
Jackyk:
Когда я 33 раза спрашиваю, чем обусловлено ценообразование, Вы молчите и ограничиваетесь общеобучающей дошкольников фразой про "так в любом в бизнесе". Причем по сути это совершенно неверно.
А когда я читаю написанное хостерами и понимаю их ровно так, как ими написано русским по белому, начинаются скандальные посты типа "вам тут что, должны? ой-ой-ой". И тут уже выясняется, что "он его докупает".
Бесплатно - не, не должен. Надеюсь, и клиент не должен платить любую заявленную цену. Только по личному выбору, нет? Жлобы, как изъясняется уважаемый mvolgin - они, знаете ли, в разных местах встречаются. И на рынке с двух сторон, и в зеркале...

Можно узнать, что такое обусловленное ценообразование?

Почему его кто-то должен обуславливать? Разве клиент выбирает по обуславлимоести услуги? Или по соотношениям цена-скорость-качество все-таки?

Я это к чему, тема напоминает нытье:

"Вот "Ресторан" в России не дают рефиллить бесплатно напитки, а в ЕС/США Макдаки дают, я никому и никогда не рекомендую брать еду в "Ресторане" в России, за каждый стаканчик колы Вы заплатите 150 рублей!!!1!111 "

А на разумные аргументы только и слышно "Обоснуйте".

Жлобы не жлобы, никто Романа не заставлял платить под дулом пистолета (а такое в ресторанах в ЕС происходит частенько - хорошо, между прочим, поставленный бизнес).

eServer.ru прикольно отожгли, стоит знать тонкости их работы
Jackyk:
Ну в-общем ясно, спасибо. То есть это примерно как если бы драли дополнительные почасовые деньги за ssh или даже ftp, если бы нашлись те, кто готов их платить.

С большинством серверов IPKVM не идет бесплатно, так почему хостер должен его отдать бесплатно?

Он докупает его и должен отдать бесплатно? А почему сервер не дать бесплатно?

И да в Windows Вы за терминалки будете платить, ой-ой-ой сколько будете платить. (это к ssh и ftp за деньги)

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