How to Fast Reboot a System to a Specific GRUB Entry

Other Fast Reboot feature enhancements that were introduced in the OpenSolaris 2010.03 release include the capability for fast rebooting a system to the n th GRUB entry and the ability to fast reboot a system to a newly-activated boot environment (BE).

Note the you must be the root user or assume an equivalent role to perform the following tasks.

1. To fast reboot a system to the n th entry, first use the bootadm list-menu command to list all of the available BEs on the system:

# bootadm list-menu
    the location for the active GRUB menu is: /rpool/boot/grub/menu.lst
    default 0
    timeout 10
    0 snv_111
    1 snv_111 Solaris xVM
    2 snv_111 failsafe
    3 zfsbe2
    4 zfsbe2 Solaris xVM
    5 zfsbe2 failsafe

2. Then, to reboot a specific GRUB boot entry, use the reboot n command, where n is the number of the BE that you want to boot.

For example, to fast reboot the system to zfsbe2, you would type:

# reboot 3

3. To fast reboot a newly-activated BE, first activate the BE, then reboot to it, as shown in the following example:

# beactivate opensolaris-4
# reboot

For more information: