not sure oi support shadow migration 
or you may be to send zpool to another server then send back to  do defrag

Sent from my iPad

On Dec 19, 2011, at 8:15, Gary Mills <> wrote:

> On Mon, Dec 19, 2011 at 11:58:57AM +0000, Jan-Aage Frydenbø-Bruvoll wrote:
>> 2011/12/19 Hung-Sheng Tsao (laoTsao) <>:
>>> did you run a scrub?
>> Yes, as part of the previous drive failure. Nothing reported there.
>> Now, interestingly - I deleted two of the oldest snapshots yesterday,
>> and guess what - the performance went back to normal for a while. Now
>> it is severely dropping again - after a good while on 1.5-2GB/s I am
>> again seeing write performance in the 1-10MB/s range.
> That behavior is a symptom of fragmentation.  Writes slow down
> dramatically when there are no contiguous blocks available.  Deleting
> a snapshot provides some of these, but only temporarily.
> -- 
> -Gary Mills-        -refurb-        -Winnipeg, Manitoba, Canada-
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