On Sun, May 15, 2011 at 10:14 PM, Richard Elling <richard.ell...@gmail.com> wrote: > On May 15, 2011, at 10:18 AM, Jim Klimov <jimkli...@cos.ru> wrote: >> In case of RAIDZ2 this recommendation leads to vdevs sized 6 (4+2), 10 (8+2) >> or 18 (16+2) disks - the latter being mentioned in the original post. > > A similar theory was disproved back in 2006 or 2007. I'd be very surprised if > there was a reliable way to predict the actual use patterns in advance. > Features > like compression and I/O coalescing improve performance, but make the old > "rules of thumb" even more obsolete.
I thought that having data disks that were a power of two was still recommended, due to the way that ZFS splits records/blocks in a raidz vdev. Or are you responding to some other point? -B -- Brandon High : bh...@freaks.com _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
