"can not read the pool label from '<disk>', NOTICE spa_import_rootpool: error 5
Attempting to upgrade a host, received this after activating the new boot environment and rebooting. very similar to this old thread: https://community.oracle.com/mosc/discussion/3607832/can-not-read-the-pool-label-from-notice-spa-import-rootpool-error-5
I'm able to re-activate the previous boot environment can get into the system.
I don't currently have an Solaris boot image to attempt exporting/importing the rpool
root@brk-x4500-1:~# uname -a
SunOS brk-x4500-1 5.11 11.3 i86pc i386 i86pc
root@brk-x4500-1:~# zpool status rpool
pool: rpool
state: ONLINE
scan: resilvered 14.2G in 6m07s with 0 errors on Fri Aug 26 09:58:00 2016
config:
NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
c5t0d0 ONLINE 0 0 0