illumos gate

when showing 'ONLINE' instead of 'DEGRADED' while adding a mirror

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2. OpenIndiana 151a7 gives:
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   thomas@testoi:~# zpool status -v rpool1
   pool: rpool1
   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.
   scan: resilver in progress since Wed Jun 26 13:40:00 2013
   1.22G scanned out of 17.9G at 40.3M/s, 0h7m to go
   1.22G resilvered, 6.83% done
   config:

   NAME STATE READ WRITE CKSUM
   rpool1 ONLINE 0 0 0
   mirror-0 ONLINE 0 0 0
   c6t8d1s0 ONLINE 0 0 0
   c6t6d1s0 ONLINE 0 0 0 (resilvering)

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2. Oracle Solaris 11.1 gives:
3. -------------------------------------
   root@testsol:~# zpool status
   pool: rpool
   state: DEGRADED
   status: One or more devices is currently being resilvered. The pool will
   continue to function in a degraded state.
   action: Wait for the resilver to complete.
   Run 'zpool status -v' to see device specific details.
   scan: resilver in progress since Fri Jun 28 13:37:55 2013
   2,29G scanned out of 29,4G at 57,2M/s, 0h8m to go
   2,29G resilvered, 7,80% done
   config:

   NAME STATE READ WRITE CKSUM
   rpool DEGRADED 0 0 0
   mirror-0 DEGRADED 0 0 0
   c7t14d1 ONLINE 0 0 0
   c7t13d1 DEGRADED 0 0 0 (resilvering)

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maybe this is intentional, because the initial zpool comprises of only one disk and compared to this state it is 'not degraded'?