System Administration Guide: Basic Administration

How Multiple Operating Systems Are Supported by GRUB

This section describes how multiple operating systems that are on the same disk are supported with GRUB. The following is an example of an x86 based system that has the Solaris 10 10/08 OS, the Solaris 9 OS, Linux, and Windows installed on the same disk.

Table 15–2 Sample GRUB Menu Configuration

Operating System 

Location on Disk 


fdisk partition 0


fdisk partition 1


fdisk partition 2

Solaris 9 OS 

Slice 0

Solaris 10 10/08 OS 

Slice 3

Based on the preceding information, the GRUB menu would look like the following:

title Solaris 10
			findroot (pool_rpool,0,a)
			kernel$ /platform/i86pc/multiboot -B $ZFS-BOOTFS
			module /platform/i86pc/boot_archive
title Solaris 9 OS (pre-GRUB)
			root (hd0,2,a)
			chainloader +1
title Linux
			root (hd0,1)
			kernel <from Linux GRUB menu...>
			initrd <from Linux GRUB menu...>
title Windows
			root (hd0,0)
			chainloader +1

Note –

The Solaris slice must be the active partition. Also, do not indicate makeactive under the Windows menu. Doing so causes the system to boot Windows every time. Note that if Linux has installed GRUB on the master boot block, you cannot access the Solaris boot option. The inability to access the Solaris boot option occurs whether or not you designate it as the active partition.

In this case, you can do one of the following:

For information about the Solaris Live Upgrade boot environment, see Solaris Express Installation Guide: Solaris Live Upgrade and Upgrade Planning.