Date: Mon, 05 Oct 1998 15:02:31 -0400 From: "Gary Palmer" <gpalmer@FreeBSD.ORG> To: Terry Lambert <tlambert@primenet.com> Cc: oppermann@pipeline.ch (Andre Oppermann), freebsd-fs@FreeBSD.ORG Subject: Re: filesystem safety and SCSI disk write caching Message-ID: <5889.907614151@gjp.erols.com> In-Reply-To: Your message of "Mon, 05 Oct 1998 18:50:04 -0000." <199810051850.LAA23549@usr01.primenet.com>
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Terry Lambert wrote in message ID <199810051850.LAA23549@usr01.primenet.com>: > > > > > I can post (once again) the results of a Novell study on server usage > > > > > patterns. The 30,000 foot view for a typical server breaks down to: > > > > > > > > > > 75% reads > > > > > 15% writes > > > > > 8% directory search operations > > > > > 2% other > This would be a very good idea. > > It would be best to instrument at the lowest level, *below* where > soft updates does its implicit write gathering, and/or any elevator > sorting occurs. Depends on what you want to gather. The stats quotes above would seem to be (IMHO) application<->FS layer transactions, not FS<->disk transactions. And to be honest, you'd need both sets of figures (as well as a good bit of analysis code which goes far beyond percentages) to obtain any sort of `optimizations' based off those figures. It would be really interesting to instrument at the application<->FS layer a few of the different server types (POP3/MTA only, IMAP/MTA only, news, etc) and see just what the access patterns are. I'm personally very curious about the POP3/MTA systems using off-the-shelf software. Gary -- Gary Palmer FreeBSD Core Team Member FreeBSD: Turning PC's into workstations. See http://www.FreeBSD.ORG/ for info To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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