Hello All
i want to add second disk to existing rpool with one disk.
but when i run this command it returns this error,,why?

"device is too small?? "
(all of my disks are simillar.)
here are my information:
# zpool status
  pool: rpool
 state: ONLINE
 scrub: none requested
config:

        NAME        STATE     READ WRITE CKSUM
        rpool       ONLINE       0     0     0
          c0t0d0s0  ONLINE       0     0     0

errors: No known data errors

# zpool attach rpool c0t0d0s0 c0t8d0
cannot attach c0t8d0 to c0t0d0s0: device is too small

# format
Searching for disks...done

c0t11d0: configured with capacity of 34.18GB


AVAILABLE DISK SELECTIONS:
       0. c0t0d0 <SEAGATE-ST336704LC-0002 cyl 14087 alt 2 hd 12 sec 424>
          /p...@1f,4000/s...@3/s...@0,0
       1. c0t8d0 <SEAGATE-ST336704LC-0002-34.18GB>
          /p...@1f,4000/s...@3/s...@8,0
       2. c0t10d0 <drive type unknown>
          /p...@1f,4000/s...@3/s...@a,0
       3. c0t11d0 <SEAGATE-ST336704LC-0002 cyl 14087 alt 2 hd 12 sec 424>
          /p...@1f,4000/s...@3/s...@b,0
       4. c0t12d0 <SEAGATE-ST336704LC-0002 cyl 14087 alt 2 hd 12 sec 424>
          /p...@1f,4000/s...@3/s...@c,0

# df -ah
Filesystem             size   used  avail capacity  Mounted on
rpool/ROOT/s10s_u6wos_07b
                        33G   4.2G    28G    14%    /
/devices                 0K     0K     0K     0%    /devices
ctfs                     0K     0K     0K     0%    /system/contract
proc                     0K     0K     0K     0%    /proc
mnttab                   0K     0K     0K     0%    /etc/mnttab
swap                  1014M   1.5M  1012M     1%    /etc/svc/volatile
objfs                    0K     0K     0K     0%    /system/object
sharefs                  0K     0K     0K     0%    /etc/dfs/sharetab
fd                       0K     0K     0K     0%    /dev/fd
rpool/ROOT/s10s_u6wos_07b/var
                        33G    67M    28G     1%    /var
swap                  1012M     0K  1012M     0%    /tmp
swap                  1012M    40K  1012M     1%    /var/run
rpool/export            33G    20K    28G     1%    /export
rpool/export/home       33G    18K    28G     1%    /export/home
rpool                   33G    94K    28G     1%    /rpool
-hosts                   0K     0K     0K     0%    /net
auto_home                0K     0K     0K     0%    /home
lct:vold(pid546)         0K     0K     0K     0%    /vol

why it returns this error?
Regards
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