Date: Wed, 30 Mar 2005 09:09:40 -0800 (PST) From: Doug White <dwhite@gumbysoft.com> To: Andrey Koklin <aka@veco.ru> Cc: Maxim Sobolev <sobomax@portaone.com> Subject: Re: ciss(4): speed degradation for Compaq Smart Array [edited] Message-ID: <20050330090813.B64732@carver.gumbysoft.com> In-Reply-To: <20050330191824.4c08acc6.aka@veco.ru> References: <20050330191824.4c08acc6.aka@veco.ru>
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On Wed, 30 Mar 2005, Andrey Koklin wrote: > Firstly, I'm thankful to people who had found time to answer my previous > messed post privately. Indeed, I hadn't put there key information about > my system configuration, as well as the tests themselves say little or > nothing on real disk system performance (they used 1K blocks and didn't > take into consideration disks geometry). You've still omitted the array setup, including RAID type and stripe size. I'd also suggest using a tool like iozone to run your tests instead of dd. Unless your workload consists of entirely sequential writes this perf test is worthless. -- Doug White | FreeBSD: The Power to Serve dwhite@gumbysoft.com | www.FreeBSD.org
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