Date: Fri, 17 Dec 1999 15:13:21 -0500 (EST) From: David Gilbert <dgilbert@velocet.ca> To: Mike Smith <msmith@freebsd.org> Cc: David Gilbert <dgilbert@velocet.ca>, freebsd-current@freebsd.org Subject: Re: AMI MegaRAID datapoint. Message-ID: <14426.39265.260916.742812@trooper.velocet.net> In-Reply-To: <199912172002.MAA00660@mass.cdrom.com> References: <14426.20641.329657.464545@trooper.velocet.net> <199912172002.MAA00660@mass.cdrom.com>
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>>>>> "Mike" == Mike Smith <msmith@freebsd.org> writes: Mike> Try enabling DirectIO and WriteBack if you haven't already. Mike> AMI's RAID5 implementation seems to suffer from rewriting the Mike> entire stripe when you do sub-stripe-sized writes, but I'm not Mike> sure about that yet. Already done. This would explain why 128K stripes are bad. Mike> The Mylex controllers seem to have a small edge in performance, Mike> which may be due to them doing cache-line-sized I/Os (usually Mike> only 8k) in that case. Maybe so, but they also don't seem to support the LVD-enabled versions of the Mylex cards. Dave. -- ============================================================================ |David Gilbert, Velocet Communications. | Two things can only be | |Mail: dgilbert@velocet.net | equal if and only if they | |http://www.velocet.net/~dgilbert | are precisely opposite. | =========================================================GLO================ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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