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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!news.cs.su.oz.au!metro!metro!munnari.OZ.AU!news.ecn.uoknor.edu!feed1.news.erols.com!cpk-news-hub1.bbnplanet.com!news.bbnplanet.com!EU.net!Ireland.EU.net!maths.tcd.ie!maths.tcd.ie!not-for-mail From: ajudge@maths.tcd.ie (Alan Judge) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: FreeBSD 2.1.6 Striping Performance Date: 10 Feb 1997 11:21:10 -0000 Organization: Dept. of Maths, Trinity College, Dublin, Ireland. Lines: 21 Sender: mathnews@gosset.maths.tcd.ie Message-ID: <5dn0b6$mvs@gosset.maths.tcd.ie> References: <5d87kv$sin@news.pcslink.com> <5d9ncn$hv@gosset.maths.tcd.ie> <craigs-ya02408000R0802970017580001@news.os.com> NNTP-Posting-Host: gosset.maths.tcd.ie Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:35515 craigs@os.com (Craig Shrimpton) writes: >Several people have suggested that one should use the maximum interleave >(65536) for a news spool. The theory is that the interleave should be 1 >disk cylinder. Yep, I'd guess that the numbers should be different for news, where small file I/O matters and sequential performance doesn't. I don't have any experience here myself, but I would be interested in hearing what you find out as I'll be setting up a CCD based news system soon. A possible value might be 4096 (the size of a notional cylinder from CCD) or 65536 (the size of a cylinder group). I've also found that adjusting the interleave so that it doesn't divide evenly into 4096 can be a good idea. Otherwise, disk 0 in the stripe bears a lot of the meta-information load. (Watch what fsck or newfs does to the disks for an interleave of 128 and then 127.) -- Alan Judge Like punning, programming is a play on words. -- Alan Perlis