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.
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? -- 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-discuss
