On December 21, 2009 10:45:29 PM -0500 Ross Walker <rswwal...@gmail.com>
wrote:
Scrubbing on a routine basis is good for detecting problems early, but it
doesn't solve the problem of a double failure during resilver. As the
size of disks become huge the chance of a double failure during
resilvering increases to the point of real possibility. Due to the amount
of data, the bit error rates of the medium and the prolonged stress of
resilvering these monsters.
For up to 1TB drives use nothing less than raidz2. For 1TB+ drives use
raidz3. Avoid raidz vdevs larger than 7 drives, better to have multiple
vdevs both for performance and reliability.
Would be good fodder for the best practices doc, if you have the math
to back it up.
-frank
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