[OmniOS-discuss] Slow write performance

[Rune Tipsmark]

Not sure if it's expected but for reference here are some numbers from my two pools, the drives are Seagate ST4000NM0023, controllers is LSI 9207-4i4e


        NAME                       STATE     READ WRITE CKSUM
        pool01                     ONLINE       0     0     0
          mirror-0                 ONLINE       0     0     0
            c1t5000C50055FC9533d0  ONLINE       0     0     0
            c1t5000C50055FE6A63d0  ONLINE       0     0     0
          mirror-1                 ONLINE       0     0     0
            c1t5000C5005708296Fd0  ONLINE       0     0     0
            c1t5000C5005708351Bd0  ONLINE       0     0     0
          mirror-2                 ONLINE       0     0     0
            c1t5000C500570858EFd0  ONLINE       0     0     0
            c1t5000C50057085A6Bd0  ONLINE       0     0     0
        logs
          c9d0                     ONLINE       0     0     0
        cache
          c7d0                     ONLINE       0     0     0
          c11d0                    ONLINE       0     0     0

root at zfs10:~# time dd if=/dev/zero of=/pool02/dd.tst bs=1024000 count=20000
20000+0 records in
20000+0 records out
20480000000 bytes (20 GB) copied, 50.6698 s, 404 MB/s

And the other pool

        NAME                       STATE     READ WRITE CKSUM
        pool02                     ONLINE       0     0     0
          mirror-0                 ONLINE       0     0     0
            c1t5000C50057086307d0  ONLINE       0     0     0
            c1t5000C50057086B67d0  ONLINE       0     0     0
          mirror-1                 ONLINE       0     0     0
            c1t5000C500570870D3d0  ONLINE       0     0     0
            c1t5000C50057089753d0  ONLINE       0     0     0
        logs
          c10d0                    ONLINE       0     0     0
        cache
          c12d0                    ONLINE       0     0     0
          c8d0                     ONLINE       0     0     0

root at zfs10:~# time dd if=/dev/zero of=/pool01/dd.tst bs=1024000 count=20000
20000+0 records in
20000+0 records out
20480000000 bytes (20 GB) copied, 50.2413 s, 408 MB/s

Maybe try creating a pool from disks on one of the controllers and test.


Venlig hilsen / Best regards,
Rune Tipsmark

From: OmniOS-discuss [mailto:omnios-discuss-bounces at lists.omniti.com] On Behalf Of Matthew Lagoe
Sent: Friday, May 16, 2014 9:15 PM
To: omnios-discuss at lists.omniti.com
Subject: [OmniOS-discuss] Slow write performance

I have a system that I am building, 2 x E5-2620 with 3 x LSI 9207-8e one drive from each mirror plugged into one HBA, configuration is below

On reads I get about 653 MB/s (which is great) and writes 263 MB/s

A single drive gets around 120MB/s read and 90MB/s write and is a ST3000NM0023 sas Seagate I would assume write performance should go up with number of vdev's however it seems to only increase by ~60%.

Is this expected?

        NAME                       STATE     READ WRITE CKSUM
        tank                       ONLINE     0     0     0
          mirror-0                 ONLINE       0     0     0
            c4t5000C50057B946C7d0  ONLINE       0     0     0
            c4t5000C50057B9792Bd0  ONLINE       0     0     0
            c4t5000C50057BA72B3d0  ONLINE       0     0     0
          mirror-1                 ONLINE       0     0     0
            c4t5000C50057BA7F0Bd0  ONLINE       0     0     0
            c4t5000C50057BFA69Bd0  ONLINE       0     0     0
            c4t5000C50057C1A177d0  ONLINE       0     0     0
          mirror-2                 ONLINE       0     0     0
            c4t5000C50057C3CDF3d0  ONLINE       0     0     0
            c4t5000C5005815632Fd0  ONLINE       0     0     0
            c4t5000C5005815650Fd0  ONLINE       0     0     0
          mirror-3                 ONLINE       0     0     0
            c4t5000C5005817ECF7d0  ONLINE       0     0     0
            c4t5000C50058185583d0  ONLINE       0     0     0
            c4t5000C500581C8397d0  ONLINE       0     0     0
          mirror-4                 ONLINE       0     0     0
            c4t5000C500581CB967d0  ONLINE       0     0     0
            c4t5000C500581CD21Bd0  ONLINE       0     0     0
            c4t5000C500581F147Fd0  ONLINE       0     0     0


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