Frank Cusack wrote:
On October 20, 2006 8:43:03 AM -0700 Ed Gould <[EMAIL PROTECTED]> wrote:
On Oct 20, 2006, at 0:48, Torrey McMahon wrote:
Anthony Miller wrote:
I want to create create a raidz on one array and have it mirrored to
the other array.
Do you think this will get you more availability compared to a simple
mirror? I'm curious as to why you would want to do this.
This configuration will survive the failure of one drive in either RAIDZ
*plus* the failure of any number of drives (or the whole mirror) in the
other. That may or may not be valuable enough to choose, but it will
survive more failures than just a mirror.
Yes, it will survive more failures (one more, I think), but will that
deliver more availability? Especially at the (high) cost of performance
of a raidz vs a stripe.
Yes, RAID-Z+mirror (or RAID-5+1) will provide better availability than
RAID-Z+dynamic_stripe (or RAID-5+0). It will also provide better MTTDL.
Random, small iop read performance will be similar to a pair of mirrored disks.
-- richard
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