Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!usc!samsung!munnari.oz.au!metro!news From: dawes@suphys.physics.su.OZ.AU (David Dawes) Newsgroups: comp.unix.sysv386 Subject: Re: File system performance Message-ID: <1990Nov3.124110.2155@metro.ucc.su.OZ.AU> Date: 3 Nov 90 12:41:10 GMT References: <294@audfax.audiofax.com> Sender: news@metro.ucc.su.OZ.AU (news) Organization: Uni Computing Service, Uni of Sydney, Australia Lines: 33 Nntp-Posting-Host: suphys.physics.su.oz.au From article <294@audfax.audiofax.com>, by arnold@audiofax.com (Arnold Robbins): > rcd@ico.isc.com (Dick Dunn) writes: >> The BSD-style file system is a far better performer. > > In article <1990Nov01.114726.14348@nstar.uucp> larry@nstar.uucp (Larry Snyder) writes: >>Yes - but 8K blocks - just think what that would do to your partition >>with all the news articles -- > > The BSD file system has both blocks and fragments. On an 8K file system > the fragment size will be 1K; files that are less than that in size only > take up a single 1K fragment. This is even more efficient than the 2K > file system which uses 2K blocks. So, go right ahead and put your news > partition on BSD file system'ed partition. > > I have to testify as to the speed of the BSD filesystem. When we switched > to it with ESIX rev D our systems sped up very noticeably! I too am using ESIX rev D with ffs. One of my file systems became heavily fragmented, and got to the point where there were 0 free blocks, and 5000 free frags. df reported 10000 blocks free, but attempting to write to the file system resulted in "Disk full" errors. This meant that I had an unusable 5MB on a 65MB file system. (BTW, there were plenty of free inodes.) Is this how FFS is supposed to work, or is there a problem with the ESIX implementation? David -- ------------------------------------------------------------------------------ David Dawes (dawes@suphys.physics.su.oz.au) DoD#210 | Phone: +612 692 2639 School of Physics, University of Sydney, Australia | Fax: +612 660 2903 ------------------------------------------------------------------------------