Very low disk performance Highpoint 1820a

[Eric Anderson]

Peter Losher wrote:
> Steven Hartland wrote:
> 
> 
>>5.4-STABLE Highpoint 1820a RAID 5 ( 5 disk )
>>dd if=/dev/da0 of=/dev/null bs=64k count=10000
>>10000+0 records in
>>10000+0 records out
>>655360000 bytes transferred in 13.348032 secs (49097875 bytes/sec)
> 
> 
> Have you tried the driver supplied by Highpoint as a pre-compiled kernel
> module?  I have a 1820A with 4x400GB Hitachi SATA disks (RAID5 + 1 Hot
> Spare) in a system running 5.3-RC3/amd64, where I have to use the kernel
> module, and I get almost double the speed that you have:
> 
> -=-
> % dd if=/dev/da0 of=/dev/null bs=64k count=10000
> 10000+0 records in
> 10000+0 records out
> 655360000 bytes transferred in 7.775190 secs (84288614 bytes/sec)

I'm using fiber channel SATA, and I get 2x write as I do read, which 
doesn't make sense to me.  What kind of write speeds do you get?  My 
tiny brain tells me that reads should be faster than writes with a RAID5.

Eric



-- 
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Eric Anderson        Sr. Systems Administrator        Centaur Technology
A lost ounce of gold may be found, a lost moment of time never.
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