Date: Thu, 16 Dec 1999 14:08:17 -0500 (EST) From: David Gilbert <dgilbert@velocet.ca> To: Brad Knowles <blk@skynet.be> Cc: David Gilbert <dgilbert@velocet.ca>, Brad Knowles <brad@shub-internet.org>, freebsd-current@FreeBSD.ORG Subject: Re: AMI MegaRAID datapoint. Message-ID: <14425.14497.356453.187331@trooper.velocet.net> In-Reply-To: <v0422081bb47ee1f84029@[195.238.1.121]> References: <14425.2778.943367.365945@trooper.velocet.net> <v0422081ab47ebe7ceb22@[195.238.1.121]> <14425.6118.899093.621159@trooper.velocet.net> <v0422081bb47ee1f84029@[195.238.1.121]>
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>>>>> "Brad" == Brad Knowles <blk@skynet.be> writes: Brad> It sounds like the second RAID-5 bug listed on the page I Brad> mentioned: >>> 28 September 1999: We have seen hangs when perform heavy I/O to >>> RAID-5 plexes. The symptoms are that processes hang waiting on >>> vrlock and flswai. Use ps lax to display this information. >>> >>> Technical explanation: A deadlock arose between code locking >>> stripes on a RAID-5 plex (vrlock) and code waiting for buffers to >>> be freed (flswai). >>> >>> Status: Being fixed. Maybe, maybe not. My crashes have a different signature than your according to Greg. Brad> I believe that I have seen this bug myself, but in my only Brad> I have never been impressed with the benchmarking that bonnie Brad> is capable of. In my experience, rawio is a much better tool, Brad> because it handles coordinating large numbers of child Brad> processes, doesn't lose information in communications between Brad> the parent and the child processes, by-passes all the filesystem Brad> overhead, etc.... Brad> If you want to do filesystem level benchmarking, I've been Brad> more impressed by what I've seen out of Postmark. ... well... one of the pros that I have heard for bonnie is that you get a number that is close to what you can expect with applications... vs. something like rawio that is isolating one system for intensive testing. I often use bonnie as a good weathervane of how fast a "whole system" is with it's disk. 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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