Date: Sun, 05 Feb 2006 12:04:52 +0100 From: Philippe Pegon <Philippe.Pegon@crc.u-strasbg.fr> To: Ivan Voras <ivoras@fer.hr> Cc: stable@freebsd.org Subject: Re: Compaq Proliant CISS slow writes Message-ID: <43E5DBD4.8010908@crc.u-strasbg.fr> In-Reply-To: <43E52A89.4020700@fer.hr> References: <43E52A89.4020700@fer.hr>
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Ivan Voras wrote: > I need to get a Proliant machine with 2 P3 processors running FreeBSD 6. > I don't know much about the machine, I think it's ML 380 G2 or close to > that, but I have physical access. So far, everything is fine (once the > inability to boot from CD-ROM is circumvented), except one "detail": > horrible write performance on its CISS 5 RAID5 array. I get ~75MB/s > burst (large blocks) reads, and only 5MB/s burst writes. I know how > RAID5 works, but still, this is bad. The machine has been running Linux > before this and performance was Ok - I didn't benchmark it but the > "feeling" when working on it was normal, while on FreeBSD it's noticably > slow in mixed read/write load. > > Is there anything I can try to improve this? In the verbose boot log > there's a line that says the controller supports "simple, performant and > MEMQ" modes, and the one that's used is "simple" - does this have any > influence? If so, how to change it? > > Thanks! do you have write cache on your Smart Array 532 ? I had the same problem last year with a Smart Array 642, this controller is sold without write cache and we needed to buy the couple battery/write cache for it to have good write performance. -- Philippe Pegon
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