zfs/zpool upgrade required?

[Jeremy Chadwick]

On Mon, May 09, 2011 at 12:42:42PM +0200, Robert Schulze wrote:
> Am 04.05.2011 13:55, schrieb Jeremy Chadwick:
> >>Is it _required_ to upgrade existing pools and filesystems or can
> >>that be done anytime later?
> >
> >- It can be done later, though by not upgrading you lose the ability to
> >use newer features.
> 
> well, the features are not the reason to upgrade the kernel. One
> more question: could the pools and filesystems be upgraded while
> there is pressure on them, or shall this procedure be made
> "offline", i.e. without any clients accessing the machine?

It can be done while I/O requests are being handled.  Depending on pool
size, amount of data, etc. the "upgrade" commands may take some time,
though.  If you're worried about customer/client impact, you'd best
schedule downtime/a maintenance window.

-- 
| Jeremy Chadwick                                   jdc at parodius.com |
| Parodius Networking                       http://www.parodius.com/ |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.               PGP 4BD6C0CB |