On Tue, 31 May 2011, Edward Ned Harvey wrote:
If you make it a 3-way mirror, your write performance will be unaffected, but your read performance will increase 50% over a 2-way mirror. All 3 drives can read different data simultaneously for the net effect of 3x a single disk read performance.
I think that a read performance increase of (at most) 33.3% is more correct. You might obtain (at most) 50% over one disk by mirroring it.
Zfs makes a random selection of which disk to read from in a mirror set so the improvement is not truely linear.
Bob -- Bob Friesenhahn bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
