VMware ESX, ESXi, vSphere и Infrastructure - [531] :: Другие ОС

Дядьки, а ковырял ли кто-нибудь производительность vsan серьезно? У меня почему-то получается что vsan с более быстрым chache tier ssd и двумя capacity hdd зачастую оказывается быстрее более медленного чистого ssd. На тестовом хосте с сделал один datastore из одного четырехтерового ssd samsung 860 qvo, второй vsan datastore из полутеровгого samsung 750 evo и двух hdd и третий datastore из одного hdd. Сделал вм с системой и четыремя дисками по 100 гигов - на чистом ssd, два на vsan с одним и двумя stripe и на чистом hdd. Провел ряд синтетических тестов, но потом понял что с ssd это муторное дело - нужно чтобы ram и slc кэши были к началу каждого теста пустые и во время теста перекрывались в несколько раз, а с vsan'ом еще и дожидаться окончания destage'а. А чтобы добраться до пороговой задержки этих тестов нужно довольно много. В общем подзабросил я это дело и просто одновременно запустил установку виндовс сервера на ssd и vsan. В итоге на vsan втало на пол минуты быстрее, понятно что на большом объеме vsan конкретно отстанет. По каким алгоритмам происходит tearing в vsan?
Если кому интересно вот результаты моих неправильных экспериментов.

Код:

[root@localhost ~]# for dsk in sdb sdc sdd sde; do echo $dsk; dd if=/dev/zero of=/dev/$dsk bs=1M count=1000 oflag=direct; done
sdb
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB, 1000 MiB) copied, 6.84453 s, 153 MB/s
sdc
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB, 1000 MiB) copied, 5.03941 s, 208 MB/s
sdd
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB, 1000 MiB) copied, 34.8945 s, 30.0 MB/s
sde
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB, 1000 MiB) copied, 38.3273 s, 27.4 MB/s
[root@localhost ~]#
[root@localhost ~]# for dsk in sdb sdc sdd sde; do echo $dsk; dd of=/dev/null if=/dev/$dsk bs=1M count=1000 iflag=direct; done
sdb
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB, 1000 MiB) copied, 2.46322 s, 426 MB/s
sdc
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB, 1000 MiB) copied, 5.08548 s, 206 MB/s
sdd
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB, 1000 MiB) copied, 24.1373 s, 43.4 MB/s
sde
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB, 1000 MiB) copied, 19.6026 s, 53.5 MB/s
[root@localhost ~]#
[root@localhost ~]# for dsk in sdb sdc sdd sde; do echo $dsk; fio -name=test1_1G --size=1G --bs=1M --filename=/dev/$dsk --rw=write --direct=1 --end_fsync=1; done
sdb
test1_1G: (g=0): rw=write, bs=(R) 1024KiB-1024KiB, (W) 1024KiB-1024KiB, (T) 1024KiB-1024KiB, ioengine=psync, iodepth=1
fio-3.7
Starting 1 process
Jobs: 1 (f=1): [W(1)][100.0%][r=0KiB/s,w=143MiB/s][r=0,w=143 IOPS][eta 00m:00s]
test1_1G: (groupid=0, jobs=1): err= 0: pid=2304: Fri Feb 21 19:02:05 2020
write: IOPS=145, BW=146MiB/s (153MB/s)(1024MiB/7016msec)
clat (msec): min=2, max=123, avg= 6.80, stdev= 9.91
lat (msec): min=2, max=123, avg= 6.84, stdev= 9.91
clat percentiles (msec):
| 1.00th=[ 3], 5.00th=[ 3], 10.00th=[ 3], 20.00th=[ 3],
| 30.00th=[ 3], 40.00th=[ 3], 50.00th=[ 4], 60.00th=[ 4],
| 70.00th=[ 5], 80.00th=[ 7], 90.00th=[ 21], 95.00th=[ 24],
| 99.00th=[ 34], 99.50th=[ 40], 99.90th=[ 123], 99.95th=[ 124],
| 99.99th=[ 124]
bw ( KiB/s): min=118784, max=188416, per=99.74%, avg=149065.14, stdev=18215.05, samples=14
iops : min= 116, max= 184, avg=145.57, stdev=17.79, samples=14
lat (msec) : 4=60.45%, 10=25.29%, 20=4.20%, 50=9.57%, 100=0.20%
lat (msec) : 250=0.29%
cpu : usr=0.78%, sys=0.98%, ctx=1024, majf=0, minf=9
IO depths : 1=100.1%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 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=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
issued rwts: total=0,1024,0,1 short=0,0,0,0 dropped=0,0,0,0
latency : target=0, window=0, percentile=100.00%, depth=1

Run status group 0 (all jobs):
WRITE: bw=146MiB/s (153MB/s), 146MiB/s-146MiB/s (153MB/s-153MB/s), io=1024MiB (1074MB), run=7016-7016msec

Disk stats (read/write):
sdb: ios=51/1024, merge=0/0, ticks=16/6881, in_queue=6345, util=16.74%
sdc
test1_1G: (g=0): rw=write, bs=(R) 1024KiB-1024KiB, (W) 1024KiB-1024KiB, (T) 1024KiB-1024KiB, ioengine=psync, iodepth=1
fio-3.7
Starting 1 process
Jobs: 1 (f=1): [W(1)][100.0%][r=0KiB/s,w=183MiB/s][r=0,w=183 IOPS][eta 00m:00s]
test1_1G: (groupid=0, jobs=1): err= 0: pid=2318: Fri Feb 21 19:02:11 2020
write: IOPS=194, BW=194MiB/s (204MB/s)(1024MiB/5275msec)
clat (usec): min=4215, max=52936, avg=5110.68, stdev=2146.81
lat (usec): min=4243, max=52971, avg=5140.80, stdev=2146.95
clat percentiles (usec):
| 1.00th=[ 4293], 5.00th=[ 4293], 10.00th=[ 4359], 20.00th=[ 4555],
| 30.00th=[ 4621], 40.00th=[ 4752], 50.00th=[ 4948], 60.00th=[ 5080],
| 70.00th=[ 5211], 80.00th=[ 5342], 90.00th=[ 5669], 95.00th=[ 5932],
| 99.00th=[ 6718], 99.50th=[13042], 99.90th=[40109], 99.95th=[52691],
| 99.99th=[52691]
bw ( KiB/s): min=161792, max=212992, per=100.00%, avg=200294.40, stdev=15012.46, samples=10
iops : min= 158, max= 208, avg=195.60, stdev=14.66, samples=10
lat (msec) : 10=99.32%, 20=0.39%, 50=0.20%, 100=0.10%
cpu : usr=0.95%, sys=0.99%, ctx=1024, majf=0, minf=10
IO depths : 1=100.1%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 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=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
issued rwts: total=0,1024,0,1 short=0,0,0,0 dropped=0,0,0,0
latency : target=0, window=0, percentile=100.00%, depth=1

Run status group 0 (all jobs):
WRITE: bw=194MiB/s (204MB/s), 194MiB/s-194MiB/s (204MB/s-204MB/s), io=1024MiB (1074MB), run=5275-5275msec

Disk stats (read/write):
sdc: ios=50/1024, merge=0/0, ticks=47/5163, in_queue=4698, util=22.17%
sdd
test1_1G: (g=0): rw=write, bs=(R) 1024KiB-1024KiB, (W) 1024KiB-1024KiB, (T) 1024KiB-1024KiB, ioengine=psync, iodepth=1
fio-3.7
Starting 1 process
Jobs: 1 (f=1): [W(1)][100.0%][r=0KiB/s,w=32.0MiB/s][r=0,w=32 IOPS][eta 00m:00s]
test1_1G: (groupid=0, jobs=1): err= 0: pid=2327: Fri Feb 21 19:02:47 2020
write: IOPS=29, BW=29.8MiB/s (31.2MB/s)(1024MiB/34417msec)
clat (msec): min=2, max=534, avg=33.52, stdev=40.54
lat (msec): min=2, max=534, avg=33.60, stdev=40.54
clat percentiles (msec):
| 1.00th=[ 3], 5.00th=[ 4], 10.00th=[ 4], 20.00th=[ 5],
| 30.00th=[ 14], 40.00th=[ 22], 50.00th=[ 29], 60.00th=[ 34],
| 70.00th=[ 40], 80.00th=[ 49], 90.00th=[ 63], 95.00th=[ 79],
| 99.00th=[ 245], 99.50th=[ 279], 99.90th=[ 460], 99.95th=[ 535],
| 99.99th=[ 535]
bw ( KiB/s): min=12263, max=51200, per=100.00%, avg=30595.26, stdev=9396.63, samples=68
iops : min= 11, max= 50, avg=29.79, stdev= 9.24, samples=68
lat (msec) : 4=19.04%, 10=7.62%, 20=10.45%, 50=43.95%, 100=16.89%
lat (msec) : 250=1.07%, 500=0.88%, 750=0.10%
cpu : usr=0.29%, sys=0.20%, ctx=1024, majf=0, minf=10
IO depths : 1=100.1%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 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=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
issued rwts: total=0,1024,0,1 short=0,0,0,0 dropped=0,0,0,0
latency : target=0, window=0, percentile=100.00%, depth=1

Run status group 0 (all jobs):
WRITE: bw=29.8MiB/s (31.2MB/s), 29.8MiB/s-29.8MiB/s (31.2MB/s-31.2MB/s), io=1024MiB (1074MB), run=34417-34417msec

Disk stats (read/write):
sdd: ios=52/1024, merge=0/0, ticks=4/34242, in_queue=33732, util=3.68%
sde
test1_1G: (g=0): rw=write, bs=(R) 1024KiB-1024KiB, (W) 1024KiB-1024KiB, (T) 1024KiB-1024KiB, ioengine=psync, iodepth=1
fio-3.7
Starting 1 process
Jobs: 1 (f=1): [W(1)][100.0%][r=0KiB/s,w=11.0MiB/s][r=0,w=11 IOPS][eta 00m:00s]
test1_1G: (groupid=0, jobs=1): err= 0: pid=2339: Fri Feb 21 19:03:33 2020
write: IOPS=22, BW=22.3MiB/s (23.4MB/s)(1024MiB/45980msec)
clat (msec): min=2, max=574, avg=44.81, stdev=44.13
lat (msec): min=2, max=574, avg=44.89, stdev=44.13
clat percentiles (msec):
| 1.00th=[ 3], 5.00th=[ 4], 10.00th=[ 4], 20.00th=[ 15],
| 30.00th=[ 24], 40.00th=[ 33], 50.00th=[ 41], 60.00th=[ 48],
| 70.00th=[ 55], 80.00th=[ 65], 90.00th=[ 82], 95.00th=[ 104],
| 99.00th=[ 169], 99.50th=[ 275], 99.90th=[ 575], 99.95th=[ 575],
| 99.99th=[ 575]
bw ( KiB/s): min= 2048, max=45056, per=100.00%, avg=22910.00, stdev=8487.41, samples=91
iops : min= 2, max= 44, avg=22.36, stdev= 8.28, samples=91
lat (msec) : 4=13.28%, 10=3.71%, 20=8.89%, 50=37.79%, 100=30.47%
lat (msec) : 250=5.18%, 500=0.49%, 750=0.20%
cpu : usr=0.21%, sys=0.14%, ctx=1025, majf=0, minf=11
IO depths : 1=100.1%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 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=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
issued rwts: total=0,1024,0,1 short=0,0,0,0 dropped=0,0,0,0
latency : target=0, window=0, percentile=100.00%, depth=1

Run status group 0 (all jobs):
WRITE: bw=22.3MiB/s (23.4MB/s), 22.3MiB/s-22.3MiB/s (23.4MB/s-23.4MB/s), io=1024MiB (1074MB), run=45980-45980msec

Disk stats (read/write):
sde: ios=50/1024, merge=0/0, ticks=6/45818, in_queue=45307, util=2.75%

Модерирует : lynx, dg
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