Skip site navigation (1)Skip section navigation (2)
Date:      Thu, 28 Apr 2005 22:44:32 -0500
From:      Eric Anderson <anderson@centtech.com>
To:        Peter Losher <Peter_Losher@isc.org>
Cc:        Steven Hartland <killing@multiplay.co.uk>
Subject:   Re: Very low disk performance Highpoint 1820a
Message-ID:  <4271ADA0.2070000@centtech.com>
In-Reply-To: <4271812F.4060808@isc.org>
References:  <06ba01c54bff$8c5aed00$7f06000a@int.mediasurface.com> <4271812F.4060808@isc.org>

next in thread | previous in thread | raw e-mail | index | archive | help
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



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



Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4271ADA0.2070000>