On Sun, 2003-03-02 at 15:28, Greg Meyer wrote: > On Sunday 02 March 2003 05:57 pm, Mark Weaver wrote: > > Todd Lyons wrote: > > > -----BEGIN PGP SIGNED MESSAGE----- > > > Hash: SHA1 > > > > > > David E. Fox wrote on Tue, Feb 25, 2003 at 09:55:25PM -0800 : > > >>>Reiserfs should never be defragged--the elaborate tree structure it > > >>>sets up is > > >> > > >>I once heard that fragmentation is impossible in reiserfs. > > > > > > No, not impossible. Things like /var/log/* will always fragment unless > > > there is only one file that ever gets written to. However, the design > > > of the fs and how it accesses both its meta data (ie directories and > > > file entries) and file data will determine the response, especially > > > under heavy io load. > > > > but I thought there wasn't any such thing as needing to defrag a linux > > system? has something changed that I wasn't aware of? > > Things like the log files, weven if fragmented don't impact performance. > Userspace data files still rarely get fragmented at any level that impacts > performance, so no defrag necessary.
I'll second that ... I've never gotten a Unix box of any flavor above 7% fragmentation and most of that was log files. But as soon as logrotate ran it dropped back to less than 1%. However I do seem to remember Civileme talking about some guy in Alaska who managed to hit some unreal number like 90% fragmentation... but I don't know much more than that.. There might be a way to further optimize a file system, but this is pretty much beyond the ken of what I know how to do. For me.... Get a faster / bus /HDD / Ram etc .... James
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