On October 24, 2006 9:19:07 AM -0700 "Anton B. Rang" <[EMAIL PROTECTED]>
wrote:
Our thinking is that if you want more redundancy than RAID-Z, you should
use RAID-Z with double parity, which provides more reliability and more
usable storage than a mirror of RAID-Zs would.
This is only true if the drives have either independent or identical
failure modes, I think. Consider two boxes, each containing ten drives.
Creating RAID-Z within each box protects against single-drive failures.
Mirroring the boxes together protects against single-box failures.
But mirroring also protects against single-drive failures.
-frank
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