SPARC: To Fall Back to the Original Boot Environment by Using a DVD, CD, or Net Installation Image

Use this procedure to boot from a DVD, CD, a net installation image or another disk that can be booted. You need to mount the root (/) slice from the last-active boot environment. Then run the luactivate command, which makes the switch. When you reboot, the last-active boot environment is up and running again.

1. At the OK prompt, boot the machine to single-user state from the Solaris Operating System DVD, Solaris Software - 1 CD, the network, or a local disk:

   OK boot cdrom -s

   or

   OK boot net -s

   or

   OK boot device_name -s

   device_name

   Specifies the name of the disk and the slice where a copy of the operating system resides, for example /dev/dsk/c0t0d0s0

2. If necessary, check the integrity of the root (/) file system for the fallback boot environment.

   # fsck device_name

   device_name

   Specifies the location of the root (/) file system on the disk device of the boot environment you want to fall back to. The device name is entered in the form of /dev/dsk/cwtxdysz.

3. Mount the active boot environment root (/) slice to some directory, such as /mnt:

   # mount device_name /mnt

   device_name

   Specifies the location of the root (/) file system on the disk device of the boot environment you want to fall back to. The device name is entered in the form of /dev/dsk/cwtxdysz.

4. From the active boot environment root (/) slice, type:

   # /mnt/sbin/luactivate

   luactivate activates the previous working boot environment and indicates the result.

5. Unmount /mnt

   # umount /mnt

6. Reboot.

   # init 6

   The previous working boot environment becomes the active boot environment.