I recently integrated this fix into ON: 6536606 gzip compression for ZFS
With this, ZFS now supports gzip compression. To enable gzip compression just set the 'compression' property to 'gzip' (or 'gzip-N' where N=1..9). Existing pools will need to upgrade in order to use this feature, and, yes, this is the second ZFS version number update this week. Recall that once you've upgraded a pool older software will no longer be able to access it regardless of whether you're using the gzip compression algorithm. I did some very simple tests to look at relative size and time requirements: http://blogs.sun.com/ahl/entry/gzip_for_zfs_update I've also asked Roch Bourbonnais and Richard Elling to do some more extensive tests. Adam >From zfs(1M): compression=on | off | lzjb | gzip | gzip-N Controls the compression algorithm used for this dataset. The "lzjb" compression algorithm is optimized for performance while providing decent data compression. Setting compression to "on" uses the "lzjb" compression algorithm. The "gzip" compression algorithm uses the same compression as the gzip(1) command. You can specify the gzip level by using the value "gzip-N", where N is an integer from 1 (fastest) to 9 (best compression ratio). Currently, "gzip" is equivalent to "gzip-6" (which is also the default for gzip(1)). This property can also be referred to by its shortened column name "compress". -- Adam Leventhal, Solaris Kernel Development http://blogs.sun.com/ahl _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
