On 11/09/2007, Mike DeMarco <[EMAIL PROTECTED]> wrote: > > 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?
Well, the CPUs are sat twiddling their thumbs. I thought reducing the amount of data going to disk might help I/O - is that unlikely? > > 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. No problem, another job for rsync then :) -- 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
