On Wed, Nov 29, 2006 at 09:53:34PM -0800, Andreas Dilger wrote: > > Even if you "mount -oro -text2 $DEV $DIR"? > > Even then, yes. It is NOT SAFE to access the same block device on > multiple nodes at one time. Even with "-o ro" the mount will cause > the journal to be recovered. And even with a ext2 filesystem, as the filesystem changes out from under the kernel (as the system that has the filesystem mounted read/write makes changes), the system that has the filesystem mounted read-only will have see inconsistencies caused by some blocks being cached and some blocks being not cached, and this could result in security violations (when blocks containing another user are read by another non-privileged users) and possibly kernel panics. The only safe way to mount a block device in a shared mode where one or more of the systems have the shared block device mounted read/write is to use a cluster-aware filesystem, such as GFS, OCFS2, or GPFS. - Ted _______________________________________________ Ext3-users mailing list Ext3-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/ext3-users
