On Mon, 21 May 2012, Jim Klimov wrote:
This is so far a relatively raw idea and I've probably missed
something. Do you think it is worth pursuing and asking some
zfs developers to make a POC? ;)

I did read all of your text. :-)

This is an interesting idea and could be of some use but it would be wise to test it first a few times before suggesting it as a general course. Zfs is still totally not foolproof. I still see postings from time to time regarding pools which panic/crash the system (probably due to memory corruption).

Zfs will try to keep the data compacted at the beginning of the partition so if you have a way to know how far out it extends, then the initial 'dd' could be much faster when the pool is not close to full.

Zfs scrub does need to do many more reads than a resilver since it reads all data and metadata copies. Triggering a resilver operation for the specific disk would likely hasten progress.

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