On Wed, 26 Nov 2008, Bob Friesenhahn wrote: > On Wed, 26 Nov 2008, Paul Sobey wrote: > An important thing to keep in mind is that each vdev offers a "write IOP". > If you put ten disks in a raidz2 vdev, then those ten disks are providing one > write IOP and a one read IOP. If you use those 10 disks to create five > mirror vdevs, then you obtain five write IOPs and ten read IOPs, but almost > half the usable disk space. This a a sort of simplistic way to look at the > performance issue, but it is still useful. > > One factor I forgot to mention, is that there is value to having multiple > pools if the performance characteristics of the pools needs to be radically > different. For example, one pool could be optimized for storage capacity > while the other is optimized for IOPS.
Excellent advice - thankyou very much. Paul _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
