Tim Cook <t...@cook.ms> writes: > On Sat, Jan 23, 2010 at 7:57 PM, Frank Cusack <fcus...@fcusack.com> wrote: > > I mean, just do a triple mirror of the 1.5TB drives rather than > say (6) .5TB drives in a raidz3. > > I bet you'll get the same performance out of 3x1.5TB drives you get > out of 6x500GB drives too.
no, it will be much better. you get 3 independent disks available for reading, so 3x the IOPS. in a 6x500 GB setup all disks will need to operate in tandem, for both reading and writing. even if the larger disks are slower than small disks, the difference is not even close to such a factor. perhaps 20% fewer IOPS? > Are you really trying to argue people should never buy anything but > the largest drives available? I don't think that's Frank's point. the key here is the advantages of a (triple) mirroring over RAID-Z. it just so happens that it makes economic sense. (think about savings in power, too.) -- Kjetil T. Homme Redpill Linpro AS - Changing the game _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
