2120S poor performance

[Chris Elsworth]

On Fri, Dec 10, 2004 at 10:41:05PM -0500, Mike Jakubik wrote:
> Steven Hartland said:
> > 2015S is though which is what I tested and it gives very similar poor
> > results
> > dmesg |grep asr:
> > asr0: ADAPTEC 2015S FW Rev. 3B05, 2 channel, 256 CCBs, Protocol I2O
> >
> > Does anyone have any RAID5 SCSI card installed that does give good
> > results in a straight dd test?
> 
> This is what i get on the following (FreeBSD 5.3-STABLE #0: Sun Nov  7
> 03:25:47 EST 2004):

Thought I'd just throw in some pennies. Adaptec 2120 with 4 36GB 15k
drives in RAID-10 on a dual Opteron setup:


aac0: i960RX 100MHz, 48MB cache memory, optional battery present
aac0: Kernel 4.0-0, Build 6011, S/N ba9122
aac0: Supported Options=1f7e<CLUSTERS,WCACHE,DATA64,HOSTTIME,RAID50,WINDOW4GB,SOFTERR,NORECOND,SGMAP64,ALARM,NONDASD>
aacd0: <RAID 0/1> on aac0
aacd0: 70379MB (144136192 sectors)

db0# diskinfo -tv aacd0
aacd0
        512             # sectorsize
        73797730304     # mediasize in bytes (69G)
        144136192       # mediasize in sectors
        8972            # Cylinders according to firmware.
        255             # Heads according to firmware.
        63              # Sectors according to firmware.

Seek times:
        Full stroke:      250 iter in   1.081569 sec =    4.326 msec
        Half stroke:      250 iter in   1.221720 sec =    4.887 msec
        Quarter stroke:   500 iter in   1.885768 sec =    3.772 msec
        Short forward:    400 iter in   0.717400 sec =    1.794 msec
        Short backward:   400 iter in   1.948922 sec =    4.872 msec
        Seq outer:       2048 iter in   1.011799 sec =    0.494 msec
        Seq inner:       2048 iter in   1.032267 sec =    0.504 msec
Transfer rates:
        outside:       102400 kbytes in   1.652271 sec =    61975 kbytes/sec
        middle:        102400 kbytes in   1.777489 sec =    57609 kbytes/sec
        inside:        102400 kbytes in   1.593512 sec =    64261 kbytes/sec

Quite happy with those figures - I hear there's a newer kernel/bios for
the 2120 which might improve performance but I've not tried it (build 7244)

-- 
Chris