SPARC: Falling Back to the Original Boot Environment

You can fallback to the original boot environment by using one of these methods:

• SPARC: To Fall Back Despite Successful New Boot Environment Activation

• SPARC: To Fall Back From a Failed Boot Environment Activation

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

SPARC: To Fall Back Despite Successful New Boot Environment Activation

Use this procedure when you have successfully activated your new boot environment but are unhappy with the results.

1. Activate the desired boot environment.

   # /sbin/luactivate BE-name

2. Reboot.

   # init 6

   The previous working boot environment becomes the active boot environment.

SPARC: To Fall Back From a Failed Boot Environment Activation

• If you experience a failure while booting the new boot environment and can boot the original boot environment in single-user mode, use this procedure to fall back to the original boot environment.

• If you need to boot from media or a net installation image, see SPARC: To Fall Back to the Original Boot Environment by Using a DVD, CD, or Net Installation Image.

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

   OK boot device-name -s

   device-name

   Specifies the name of devices from which the system can boot, use the format /dev/dsk/cwtxdysz, for example /dev/dsk/c0t0d0s0.

2. Activate the desired boot environment.

   # /sbin/luactivate BE-name

   • If this command fails to display a prompt, proceed to SPARC: To Fall Back to the Original Boot Environment by Using a DVD, CD, or Net Installation Image.

   • If the prompt is displayed, continue.

3. At the prompt, verify that you want to activate the original boot environment.

   Do you want to fallback to activate boot environment <disk name> 
   (yes or no)? yes

   A message displays that the fallback activation is successful.

4. Reboot.

   # init 6

   The previous working boot environment becomes the active boot environment.

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 Oracle Solaris Operating System DVD, Oracle 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, use the format /dev/dsk/cwtxdysz, for example /dev/dsk/c0t0d0s0.

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

   # fsck device-name

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

   # mount device-name /mnt

4. From the active boot environment root (/) slice, activate the previous working boot environment.

   # /mnt/sbin/luactivate

5. Unmount the directory.

   # umount  /mnt

6. Reboot.

   # init 6

   The previous working boot environment becomes the active boot environment.