On Sat, Feb 24, 2007 at 11:15:33AM -0800, Tor wrote: > I have read the FAQ, and it states that encrypted data can't be > compressed. But is there any point in using compression on my media > file server, that will store ripped DVD's (which are compressed in > their default state), our digital photos (JPEG - also compressed) and > HD files (mostly .ts (transport stream) - also a form of > compressionI). In other words can ZFS compress compressed files? Or > should I just forget about having compression enabled?
You can't compress encrypted files -- being able to would indicate that the crypto is broken. You can't compress already-compressed data. Not all data can be compressed by a given algorithm. Turning on compression for some ZFS filesystem and then writing pre-compresed or encrypted data to that filesystem will only waste CPU cycles though -- ZFS will try to compress the data, fail to get a good enough compression ratio, and then store the data without compression. Nico -- _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
