Date: Thu, 8 Feb 2001 04:49:52 -0800 (PST) From: Dan Phoenix <dphoenix@bravenet.com> To: Geoff Buckingham <geoffb@chuggalug.clues.com> Cc: Julian Elischer <julian@elischer.org>, Matt Dillon <dillon@earth.backplane.com>, Andrew Reilly <areilly@bigpond.net.au>, Alfred Perlstein <bright@wintelcom.net>, Andre Oppermann <oppermann@monzoon.net>, Rik van Riel <riel@conectiva.com.br>, Mike Silbersack <silby@silby.com>, Poul-Henning Kamp <phk@critter.freebsd.dk>, Charles Randall <crandall@matchlogic.com>, Jos Backus <josb@cncdsl.com>, freebsd-hackers@FreeBSD.ORG Subject: Re: vinum and qmail (RE: qmail IO problems) Message-ID: <Pine.BSO.4.21.0102080446120.3495-100000@gandalf.bravenet.com> In-Reply-To: <20010208120831.C61928@chuggalug.clues.com>
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negative on that houston :) http://www.FreeBSD.org/cgi/getmsg.cgi?fetch=52705+54899+/usr/local/www/db/text/2000/freebsd-scsi/20001008.freebsd-scsi ..i think maybe thread you are talking about. Not to much info I could find on specifically on what you are talking about. ...but again are you talking about venim or ccd? I'll keep cluster solution in mind for the 2 disks. On Thu, 8 Feb 2001, Geoff Buckingham wrote: > Date: Thu, 8 Feb 2001 12:08:31 +0000 > From: Geoff Buckingham <geoffb@chuggalug.clues.com> > To: Dan Phoenix <dphoenix@bravenet.com> > Cc: Julian Elischer <julian@elischer.org>, > Matt Dillon <dillon@earth.backplane.com>, > Andrew Reilly <areilly@bigpond.net.au>, > Alfred Perlstein <bright@wintelcom.net>, > Andre Oppermann <oppermann@monzoon.net>, > Rik van Riel <riel@conectiva.com.br>, Mike Silbersack <silby@silby.com>, > Poul-Henning Kamp <phk@critter.freebsd.dk>, > Charles Randall <crandall@matchlogic.com>, Jos Backus <josb@cncdsl.com>, > freebsd-hackers@FreeBSD.ORG > Subject: Re: vinum and qmail (RE: qmail IO problems) > > On Thu, Feb 08, 2001 at 03:41:59AM -0800, Dan Phoenix wrote: > > > > > > > > Yes I did and it made some real differences. I enabled it on /usr as well > > as /var and mounted /var with the noatime option. Doing not bad for the > > amount of email it is pushing....thing is this I/O problem never use to be > > an issue....but with growth constantly happening it has come to a hardware > > based solution. What I have recommended to the company is a scsi card in > > that machine with 2 scsi drives.....I will raid 0 then together with ccd > > or venim and mount it as /var....turn existing /var into extra swap > > space.....although i may thing of something else...as I don;t think it > > needs a gig of swap... and that should fix the I/O issue incredibly. > > Right now I have split up the load also between2 machines so that has > > helped out incredibly....but systat -vmstat is still always showing 100% > > disk usage so I will have to remedy the problem. Then I plan on moving all > > mail back to that one machine and beating the shit right out of that > > freebsd machine to see what freebsd can really handle. If anyone has some > > nice newbie docs :) on ccd or venim would be greatly appreciated. > > > > > A word of warning on this, when striping on an even number of drives > using a power of 2 as as the stripe size, it is very easy to concentrate > meta data on one drive, thereby doing away with much of your performance gain. > > Workarounds include striping at cluster size (16 or 32MB usually) using and > odd number of disks (for non raid 3/5), though or experimentation. > > There should be a number of mails on the subject in the archives of the > scsi mailing list, look for myself or greg lehay to find the thread. > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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