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>
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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. ------------------------------------------------------------------------
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