On Fri, Dec 30, 2011 at 05:57:47AM -0800, Hung-Sheng Tsao (laoTsao) wrote:
> now s11 support shadow migration, just for this purpose, AFAIK
> not sure nexentaStor support shadow migration
Does not appear that it does (at least the "shadow" property is not in
NexentaStor's zfs man page).
Thanks for the pointer.
> On Dec 30, 2011, at 2:03, Ray Van Dolson <rvandol...@esri.com> 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 <rvandol...@esri.com>
> >> 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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