Slow Write Performance on 3ware controller

[Mike Tancsa]

On Sun, 23 Jul 2006 10:53:58 -0500, in sentex.lists.freebsd.questions
you wrote:

>
>all this 3ware discussion inspired me to check out my 6.1-releng server and 
>see how its 3ware card stacks up to the previously posted scores.
>
>[root at zeus ~]# diskinfo -t /dev/twed2
>/dev/twed2
>        512             # sectorsize
>        360099151872    # mediasize in bytes (335G)
>        703318656       # mediasize in sectors
>        43779           # Cylinders according to firmware.
>        255             # Heads according to firmware.
>        63              # Sectors according to firmware.

Here is an areca 4 port PCIe in RAID 1+0

diskinfo -t da0
da0
        512             # sectorsize
        239999647744    # mediasize in bytes (224G)
        468749312       # mediasize in sectors
        29178           # Cylinders according to firmware.
        255             # Heads according to firmware.
        63              # Sectors according to firmware.

Seek times:
        Full stroke:      250 iter in   1.328484 sec =    5.314 msec
        Half stroke:      250 iter in   1.342900 sec =    5.372 msec
        Quarter stroke:   500 iter in   2.021294 sec =    4.043 msec
        Short forward:    400 iter in   0.817074 sec =    2.043 msec
        Short backward:   400 iter in   1.972321 sec =    4.931 msec
        Seq outer:       2048 iter in   0.237593 sec =    0.116 msec
        Seq inner:       2048 iter in   0.204264 sec =    0.100 msec
Transfer rates:
        outside:       102400 kbytes in   0.886375 sec =   115527
kbytes/sec
        middle:        102400 kbytes in   1.106318 sec =    92559
kbytes/sec
        inside:        102400 kbytes in   1.806561 sec =    56682
kbytes/sec

Seagate ST3120827AS

And an old 7810 in RAID5 with ST3500630As

 diskinfo -t twed1
twed1
        512             # sectorsize
        1500320366592   # mediasize in bytes (1.4T)
        2930313216      # mediasize in sectors
        182403          # Cylinders according to firmware.
        255             # Heads according to firmware.
        63              # Sectors according to firmware.

Seek times:
        Full stroke:      250 iter in   4.408301 sec =   17.633 msec
        Half stroke:      250 iter in   4.335265 sec =   17.341 msec
        Quarter stroke:   500 iter in   6.919564 sec =   13.839 msec
        Short forward:    400 iter in   2.318452 sec =    5.796 msec
        Short backward:   400 iter in   2.268990 sec =    5.672 msec
        Seq outer:       2048 iter in   0.537223 sec =    0.262 msec
        Seq inner:       2048 iter in   0.557811 sec =    0.272 msec
Transfer rates:
        outside:       102400 kbytes in   1.708543 sec =    59934
kbytes/sec
        middle:        102400 kbytes in   1.717575 sec =    59619
kbytes/sec
        inside:        102400 kbytes in   1.615723 sec =    63377
kbytes/sec
--------------------------------------------------------
Mike Tancsa, Sentex communications http://www.sentex.net
Providing Internet Access since 1994
mike at sentex.net, (http://www.tancsa.com)