On Sat, 21 Jan 2012, Jim Klimov wrote:

5) It seems like a worthy RFE to include a pool-wide option to
  "verify-after-write/commit" - to test that recent TXG sync
  data has indeed made it to disk on (consumer-grade) hardware
  into the designated sector numbers. Perhaps the test should
  be delayed several seconds after the sync writes.

This is an interesting idea. I think that you would want to do a mini-scrub on a TXG at least one behind the last one written since otherwise any test would surely be foiled by caching. The ability to restore data from RAM is doubtful since TXGs get forgotten from memory as soon as they are written.

Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
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