Date: Fri, 29 Apr 2005 13:08:57 -0500 From: Eric Anderson <anderson@centtech.com> To: killing@multiplay.co.uk Cc: freebsd-performance@freebsd.org Subject: Re: Very low disk performance Highpoint 1820a Message-ID: <42727839.4030703@centtech.com> In-Reply-To: <093701c54caa$303aac30$7f06000a@int.mediasurface.com> References: <20050428162201.39269.qmail@web41214.mail.yahoo.com><42711726.2000607@centtech.com><006201c54c46$14c0d290$b3db87d4@multiplay.co.uk> <4271EFCA.1060605@samsco.org> <093701c54caa$303aac30$7f06000a@int.mediasurface.com>
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Steven Hartland wrote: > ----- Original Message ----- From: "Scott Long" <scottl@samsco.org> > >>> Ok some real strange going on write performance is ~ 140MB/s: [..snip..] >>> where as read is ~42MB/s [..snip..] > So it doesn't seem like caching is an issue and as others are seeing > similar performance issues on other RAID controllers is could well > not be a driver issue but I'm not ruling that out as yet as it could be > the same problem in each respective driver. > So far Highpoint 1820a and 3ware ?? ( Pete can u fill in the blank here ) > are exhibiting the same issue. As I posted earlier also, I'm seeing the same behavior to a Fiber Channel RAID array (15 400GB SATA150 disks in RAID5 config). I'm using a QLogic HBA connected directly to the SATA array. 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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