On May 27, 2004 12:59 -0700, M K wrote: > Oh, good point.. BTW, what should the ideal size of a > journal be ? is there a general guideline to follow ? > I am sort-of a newbie to ext3, any advice on choosing > the journal size would be great! It hasn't really been discussed much. I'd benchmark with your apps to see what is best. For Lustre (which often has hundreds of clients doing large IOs to a single ext3 filesystem at one time) we use the largest journal size possible (400MB) to reduce the possibility that the clients get blocked waiting for journal space. Lustre creates very large journal transactions so having a larger journal means we can have more concurrent handles open and definitely improved performance. Most of our server nodes also have gobs of RAM, so journal size isn't much of an issue. For other apps there is probably some upper limit where the journal never really gets too full, and making it larger doesn't help much. It also slows down journal recovery a bit with a very large journal. 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
