On Mar 09, 2004 15:46 +0800, Isaac Claymore wrote: > I've got a workload that several clients tend to write to separate files > under a same dir simultaneously, resulting in heavily fragmented files. > And, even worse, those files are rarely read simultaneously, thus read > performance degrades quite alot. > > I'm wondering whether there's any feature that helps alleviating > fragmentation in such workloads. Does writing to different dirs(of a same > filesystem) help? Very much yes. Files allocated from different directories will get blocks from different parts of the filesystem (if available), so they should be less fragmented. In 2.6 there is a heuristic that files opened by different processes allocate from different parts of a group, even within the same directory, but that only really helps if the files themselves aren't too large (i.e. under 8MB or so). Cheers, Andreas -- Andreas Dilger http://sourceforge.net/projects/ext2resize/ http://www-mddsp.enel.ucalgary.ca/People/adilger/ _______________________________________________ Ext3-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/ext3-users
