now s11 support shadow migration, just for this  purpose, AFAIK
not sure nexentaStor support shadow migration

Sent from my iPad

On Dec 30, 2011, at 2:03, Ray Van Dolson <> wrote:

> On Thu, Dec 29, 2011 at 10:59:04PM -0800, Fajar A. Nugraha wrote:
>> On Fri, Dec 30, 2011 at 1:31 PM, Ray Van Dolson <> wrote:
>>> Is there a non-disruptive way to undeduplicate everything and expunge
>>> the DDT?
>> AFAIK, no
>>>  zfs send/recv and then back perhaps (we have the extra
>>> space)?
>> That should work, but it's disruptive :D
>> Others might provide better answer though.
> Well, slightly _less_ disruptive perhaps.  We can zfs send to another
> file system on the same system, but different set of disks.  We then
> disable NFS shares on the original, do a final zfs send to sync, then
> share out the "new" undeduplicated file system with the same name.
> Hopefully the window here is short enough that NFS clients are able to
> recover gracefully.
> We'd then wipe out the "old" zpool, recreate and do the reverse to get
> data back onto it......
> Thanks,
> Ray
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