zfs discuss - Jul 2009 - Failing device in a replicated configuration....on a non replicated pool??

I was greeted by this today. The Sun Message ID page says this should happen
when there were errors in a replicated configuration. Clearly there''s
only one drive here. If there are unrecoverable errors how can my applications
not be affected since there''s no mirror or parity to recover from?

# zpool status rpool
  pool: rpool
 state: ONLINE
status: One or more devices has experienced an unrecoverable error.  An
	attempt was made to correct the error.  Applications are unaffected.
action: Determine if the device needs to be replaced, and clear the errors
	using ''zpool clear'' or replace the device with
''zpool replace''.
   see: http://www.sun.com/msg/ZFS-8000-9P
 scrub: scrub completed after 0h3m with 0 errors on Wed Jul 29 18:52:20 2009
config:

	NAME        STATE     READ WRITE CKSUM
	rpool       ONLINE       0     0     0
	  c9d0s0    ONLINE       6     0     2

errors: No known data errors
-- 
This message posted from opensolaris.org

On Tue, 28 Jul 2009, fyleow wrote:
> I was greeted by this today. The Sun Message ID page says this 
> should happen when there were errors in a replicated configuration. 
> Clearly there''s only one drive here. If there are unrecoverable 
> errors how can my applications not be affected since there''s no 
> mirror or parity to recover from?
Metadata is stored redundantly so some metadata could become corrupted 
and recovered via the redundant copy.  In recent zfs you can set 
copies=2 to store user data redundantly on one drive.

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