zfs discuss - Aug 2007 - zpool upgrade to more storage

Hello everyone, I am slowly running out of space in my zpool.. so I wanted to 
replace my zpool with a different zpool..

my current zpool is
> zpool list
NAME                    SIZE    USED   AVAIL    CAP  HEALTH     ALTROOT
mypool                  278G    263G   14.7G    94%  ONLINE     -
> zpool status mypool
   pool: mypool
  state: ONLINE
status: One or more devices is currently being resilvered.  The pool will
         continue to function, possibly in a degraded state.
action: Wait for the resilver to complete.
  scrub: resilver in progress, 11.37% done, 10h0m to go
config:

         NAME        STATE     READ WRITE CKSUM
         mypool      ONLINE       0     0     0
           mirror    ONLINE       0     0     0
             c1t2d0  ONLINE       0     0     0
             c1t3d0  ONLINE       0     0     0

errors: No known data errors

(yes I know its resilvering one of the disks...)


Anyway that is a simple mirror zpool, I would like to create another pool lets 
say mypool2 with few more disks and use raidz2 instead... What would be my 
options to do this transfer? I cannot attach to this existing pool disks, I don 
tthink thats an option because thats mirror and not raidz2... can I create 
raidz2 and just add it to mypool using zpool add option? and then when its added
is there any way to remove originall mirror out of it? Now the tricky part is I 
have lots of snapshots on that mypool and I would like to keep them... Another 
option that I think I have is just create mypool2 as I want it to be which is 
raidz2 and then use zfs send and receive to move data around and then restroy 
original mirror when I am done replacing it with this one...

What do you think? what would you recommend? with the second option I probably 
would need to take system offline and do it and I dont even if first option 
would even work where I would just add newly created raidz2 to mypool and then 
remove original mirror out of it...

Regards,

Chris

Krzys wrote:
> Hello everyone, I am slowly running out of space in my zpool.. so I wanted
to
> replace my zpool with a different zpool..
> 
> my current zpool is
>> zpool list
> NAME                    SIZE    USED   AVAIL    CAP  HEALTH     ALTROOT
> mypool                  278G    263G   14.7G    94%  ONLINE     -
> 
>> zpool status mypool
>    pool: mypool
>   state: ONLINE
> status: One or more devices is currently being resilvered.  The pool will
>          continue to function, possibly in a degraded state.
> action: Wait for the resilver to complete.
>   scrub: resilver in progress, 11.37% done, 10h0m to go
> config:
> 
>          NAME        STATE     READ WRITE CKSUM
>          mypool      ONLINE       0     0     0
>            mirror    ONLINE       0     0     0
>              c1t2d0  ONLINE       0     0     0
>              c1t3d0  ONLINE       0     0     0
> 
> errors: No known data errors
> 
> (yes I know its resilvering one of the disks...)
> 
> 
> Anyway that is a simple mirror zpool, I would like to create another pool
lets
> say mypool2 with few more disks and use raidz2 instead... What would be my 
> options to do this transfer?
"zfs send" -- which will be much simpler when I finish "zfs send
-R".
> I cannot attach to this existing pool disks, I don 
> tthink thats an option because thats mirror and not raidz2...
Well, you *can*, it just isn''t recommended.
> can I create 
> raidz2 and just add it to mypool using zpool add option?
Yes.
> and then when its added 
> is there any way to remove originall mirror out of it?
No, not until we implement pool size reduction.
> Now the tricky part is I 
> have lots of snapshots on that mypool and I would like to keep them...
You can use "zfs send -i" to send all the snapshots.

 > Another
> option that I think I have is just create mypool2 as I want it to be which
is
> raidz2 and then use zfs send and receive to move data around and then
restroy
> original mirror when I am done replacing it with this one...
Yep.
> What do you think? what would you recommend? with the second option I
probably
> would need to take system offline and do it
With zfs send, you''d have to take it offline just for a few minutes to
do the
final incremental send of your filesystems, and switch over to using the new 
pool.

--matt