It is so easy since you just  add more of the same type to the pool.    
For raidz stuff they actually recommend no more than 9 disks in each 
raidz for best performance so you would just add multiple sets of raidz 
after the first raidz is "created".  Check BigAdmin zpool tips.

   zpool add pool mirror  c12t0d0 c13t0d0            (or whatever your 
devices are)


zpool status
  pool: pool
 state: ONLINE
 scrub: scrub completed after 1h9m with 0 errors on Sun Nov  8 01:09:49 2009
config:

        NAME                                        STATE     READ WRITE 
CKSUM
        pool                                        ONLINE       0     
0     0
          mirror                                    ONLINE       0     
0     0
            c11t600A0B8000481150000008F249B179B1d0  ONLINE       0     
0     0
            c11t600A0B80004810380000062D49B175ADd0  ONLINE       0     
0     0
          mirror                                    ONLINE       0     
0     0
            c11t600A0B80004810620000098649B17992d0  ONLINE       0     
0     0
            c11t600A0B8000480FFA0000062949B1747Cd0  ONLINE       0     
0     0
          mirror                                    ONLINE       0     
0     0
            c11t600A0B8000481150000008F149B17847d0  ONLINE       0     
0     0
            c11t600A0B80004810380000062649B1616Fd0  ONLINE       0     
0     0
          mirror                                    ONLINE       0     
0     0
            c11t600A0B8000481150000008F049B1780Dd0  ONLINE       0     
0     0
            c11t600A0B80004810380000062849B161CDd0  ONLINE       0     
0     0
          mirror                                    ONLINE       0     
0     0
            c11t600A0B80004810620000098549B1785Cd0  ONLINE       0     
0     0
            c11t600A0B8000480FFA0000062549B1610Ed0  ONLINE       0     
0     0
          mirror                                    ONLINE       0     
0     0
            c11t600A0B80004810620000098349B177F8d0  ONLINE       0     
0     0
            c11t600A0B8000480FFA0000062449B16090d0  ONLINE       0     
0     0

errors: No known data errors


Gugi Starcat wrote, On 11/13/09 09:11:
> I have read that no more disks can be added to an already created 
> RAIDZ/RAIDZ2 volume, is that true? Any workaround to expande such a pool with 
> more storage?
>   

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