On Thu, 6 Nov 2008, Chris Ridd wrote:
> I probably need to downgrade a machine from 10u5 to 10u3. The zpool on
> u5 is a v4 pool, and AIUI 10u3 only supports up to v3 pools.
The only difference between a v4 pool and a v3 pool is that v4 added
history ('zpool history <pool>'). I would expect a v3 pool to be able to
receive a v4 send stream, as the zpool history is not part of 'zfs send'.
Trying this out on my nevada box:
--------------------------------------------------------------------------------
-bash-3.2# zpool create -o version=3 v3pool c0t1d0s0
-bash-3.2# zpool create -o version=4 v4pool c0t2d0s0
-bash-3.2# zpool status
pool: v3pool
state: ONLINE
status: The pool is formatted using an older on-disk format. The pool can
still be used, but some features are unavailable.
action: Upgrade the pool using 'zpool upgrade'. Once this is done, the
pool will no longer be accessible on older software versions.
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
v3pool ONLINE 0 0 0
c0t1d0s0 ONLINE 0 0 0
errors: No known data errors
pool: v4pool
state: ONLINE
status: The pool is formatted using an older on-disk format. The pool can
still be used, but some features are unavailable.
action: Upgrade the pool using 'zpool upgrade'. Once this is done, the
pool will no longer be accessible on older software versions.
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
v4pool ONLINE 0 0 0
c0t2d0s0 ONLINE 0 0 0
errors: No known data errors
-bash-3.2# zfs create v4pool/foobar
-bash-3.2# mkfile 1m /v4pool/foobar/1meg
-bash-3.2# ls -l /v4pool/foobar/1meg
-rw------T 1 root root 1048576 Nov 6 05:53 /v4pool/foobar/1meg
-bash-3.2# zfs snapshot v4pool/[EMAIL PROTECTED]
-bash-3.2# zfs send v4pool/[EMAIL PROTECTED] | zfs recv v3pool/[EMAIL PROTECTED]
-bash-3.2# ls -l /v3pool/foobar
total 2053
-rw------T 1 root root 1048576 Nov 6 05:53 1meg
-bash-3.2# zfs list
NAME USED AVAIL REFER MOUNTPOINT
v3pool 1.09M 134G 20K /v3pool
v3pool/foobar 1.02M 134G 1.02M /v3pool/foobar
v3pool/[EMAIL PROTECTED] 0 - 1.02M -
v4pool 1.09M 134G 20K /v4pool
v4pool/foobar 1.02M 134G 1.02M /v4pool/foobar
v4pool/[EMAIL PROTECTED] 0 - 1.02M -
-bash-3.2#
--------------------------------------------------------------------------------
Works fine.
Regards,
markm
_______________________________________________
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
