On Mar 21, 2007 16:51 -0700, brian stone wrote: > My application always needs to sync file data after writing. I don't want anything handing around in the kernel buffers. I am wondering what is the best method to accomplish this. > 4. Do I use EXT3 in full journaled mode, where the data and metadata are journaled? In this case, is the journaled data sync'd or async'd? When the journal commits the data to the file system, is that sync'd or dumped into kernel buffers? > > 5. Since I will always be syncing the data, does it make any sense to use EXT3? It feels like the EXT3 journal would be unnecessary. In theory, ext3 + data=journal will give you the best performance, because sync IO will always be linear IO to the journal. Unless your filesystem is constantly busy, then the writes to the filesystem can happen asynchronously after being committed to the journal without danger of being lost. That said, nothing better than benchmarking your app with different filesystem options to see which one is best. Cheers, Andreas -- Andreas Dilger Principal Software Engineer Cluster File Systems, Inc. _______________________________________________ Ext3-users mailing list Ext3-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/ext3-users
