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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!news.cs.su.oz.au!inferno.mpx.com.au!news.unimelb.EDU.AU!munnari.OZ.AU!news.mel.connect.com.au!yarrina.connect.com.au!news.mira.net.au!Germany.EU.net!howland.reston.ans.net!gatech!news.mathworks.com!uunet!not-for-mail From: peter@nmti.com (Peter da Silva) Newsgroups: comp.unix.bsd.freebsd.misc,news.admin.technical,news.software.nntp Subject: Re: Poor performance with INN and FreeBSD. Date: 25 Mar 1996 19:54:21 -0500 Organization: Network/development platform support, NMTI Lines: 27 Sender: zorch@ftp.UU.NET Approved: zorch@uunet.UU.NET Distribution: world Message-ID: <4j6l4a$9ia@web.nmti.com> References: <311F8C62.4BC4@pluto.njcc.com> <4go23v$8hp@fozzie.sun3.iaf.nl> <DoJ1Js.H2t@unixhub.SLAC.Stanford.EDU> <4ipb5c$24om@usenetw1.news.prodigy.com> NNTP-Posting-Host: ftp.uu.net Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:15907 news.admin.technical:1360 news.software.nntp:20977 In article <4ipb5c$24om@usenetw1.news.prodigy.com>, bill davidsen <davidsen@tmr.com> wrote: > Having run on a log filesystem (JFS on AIX), I can tell you that the > log file is the bottleneck. To get performance up, first I put the > logfile on a dedicated disk (cut expire time by 3), and then on a > dedicated solid state disk (cut expire time by 3 again). This paragraph doesn't make sense to me. Maybe I'm missing something, but isn't the distinguishing feature of a log file system that all data is *only* stored in the log? I'm not familiar with JFS, but the acronym sounds like "Journalling File System"... which is to say a conventional file system with a small log containing recent updates only and primarily used for crash recovery rather than performance. The Sprite logging file system, the BDS LFS, and other pure logging file systems don't have a separate "log file" that can be stored in a dedicated disk or a solid-state disk. Rather they simply append all transactions to the logical end of the data on disk (in a round-robin fashion), and periodically checkpoint metadata (either into the log or into a series of dedicated metadata areas) pointing into the log and indicating where the files currently live. -- Peter da Silva (NIC: PJD2) `-_-' 1601 Industrial Boulevard Bailey Network Management 'U` Sugar Land, TX 77487-5013 +1 713 274 5180 "Har du kramat din varg idag?" USA Bailey pays for my technical expertise. My opinions probably scare them