On Thu, 2004-10-28 at 13:14 -0600, Michael Gale wrote: > 2. GFS does not protect against data corruption as it is the > applications responsibility to making sure that data written to a file > is complete. > 3. Maildir format does not require file locking and works great over NFS > except for the speed issue of course. "Not requiring file locking" is not the same as "not requiring any locking". > If you use Courier IMAP every body can access the same directories / > partitions at the same time because file locking is not an issue. > "IMAP_USELOCKS > > This setting in /usr/lib/courier/etc/imapd must be enabled. This > setting uses dot-lock files to synchronize updates to folder indexes > between multiple IMAP clients that have the same folder opened. > This setting is safe to use with NFS, as it does not use actual > file locking calls, and does not require the services of the problematic > NFS lock" Instead of file locking, they're doing dot-locking. I suspect GFS would work fine if you had the above setting enabled; creating a file (e.g. a dot-lock) should be atomic across the cluster. -- Lon
