SPARC: Falling Back to the Original Boot Environment

You can fallback to the original boot environment by using three 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. Become superuser or assume an equivalent role.

   Roles contain authorizations and privileged commands. For more information about roles, see Configuring RBAC (Task Map) in System Administration Guide: Security Services.

2. Type:

   # /sbin/luactivate BE_name

   BE_name

   Specifies the name of the boot environment to be activated

3. 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 Solaris Operating System DVD, Solaris Software - 1 CD, the network, or a local disk.

   OK boot device_name -s

   device_name

   Specifies the name of devices from where the system can boot, for example /dev/dsk/c0t0d0s0

2. Type:

   # /sbin/luactivate BE_name

   BE_name

   Specifies the name of the boot environment to be activated

   • 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, type:

   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 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.