Recording the Alternate Boot Device Path
Determine the path to the alternate root device by using the ls -l command on the slice that is being attached as the second submirror to the root (/) mirror.
# ls -l /dev/rdsk/c1t3d0s0
lrwxrwxrwx 1 root root 55 Mar 5 12:54 /dev/rdsk/c1t3d0s0 -> \ ../../devices/sbus@1,f8000000/esp@1,200000/sd@3,0:a
Here you would record the string that follows the /devices directory:
Solaris Volume Manager users who are using a system with OpenBoot" Prom can use the OpenBoot nvalias command to define a backup root device alias for the secondary root (/) mirror. For example:
ok nvalias backup_root /sbus@1,f8000000/esp@1,200000/sd@3,0:a
Then, redefine the boot-device alias to reference both the primary and secondary submirrors, in the order in which you want them to be used, and store the configuration.
ok printenv boot-device
boot-device = disk net
ok setenv boot-device disk backup-root net
boot-device = disk backup-root net
In the event of primary root disk failure, the system would automatically boot to the second submirror. Or, if you boot manually, rather than using auto boot, you would only enter:
ok boot backup_root