> I've got 12Gb or so of db+web in a zone on a ZFS > filesystem on a mirrored zpool. > Noticed during some performance testing today that > its i/o bound but > using hardly > any CPU, so I thought turning on compression would be > a quick win.
If it is io bound won't compression make it worse? > > I know I'll have to copy files for existing data to > be compressed, so > I was going to > make a new filesystem, enable compression and rysnc > everything in, then drop the > old filesystem and mount the new one (with compressed > blocks) in its place. > > But I'm going to be hooking in faster LUNs later this > week. The plan > was to remove > half of the mirror, attach a new disk, remove the > last old disk and > attach the second > half of the mirror (again on a faster disk). > > Will this do the same job? i.e. will I see the > benefit of compression > on the blocks > that are copied by the mirror being resilvered? No! Since you are doing a block for block mirror of the data, this would not could not compress the data. > > > -- > Rasputin :: Jack of All Trades - Master of Nuns > http://number9.hellooperator.net/ > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discu > ss This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
