On 25 Jul 2010, at 14:12, Ben <ben.lav...@gmail.com> wrote: > I've read a small amount about compression, enough to find that it'll effect > performance (not a problem for me) and that once you enable compression it > only effects new files written to the file system.
Yes, that's true. Compression on defaults to lzjb which is fast; but gzip-9 can be twice as good. (I've just done some tests on the MacZFS port on my blog for more info) > Is this still true of b134? And if it is, how can I compress all of the > current data on the file system? Do I have to move it off then back on? Any changes to the filesystem only take effect on newly written/updated files. You could do a cp to force a rewrite but in the interim would take space for the old and new copies; furthermore, if you have snapshots, then even removing the old (uncompressed) files won't get the space back. If you destroy all snapshots, then do a cp/rm on a file by file basis you may be able to do an in-place compression. Alex _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
