1. Sanity Reboot.
# shutdown -y -g0 -i6
2. Please add the below entry in menu.lst
# vi /boot/grub/menu.lst
#---------- ADDED BY BOOTADM - rootmirror ----------
title Solaris rootmirror
root (hd1,0,a)
kernel /platform/i86pc/multiboot
module /platform/i86pc/boot_archive
#---------------------END BOOTADM--------------------
Note: Now when you reboot, you will be able to see "rootmirror"
option in GRUB menu.
After break the mirror you can chose "rootmirror" from GRUB menu
to boot from the mirror disk.
3. Split off submirror:
metadetach
# metadetach d0 d20
# metadetach d1 d21
# metadetach d6 d26
4. mount the disk to be unencapsulated on mountpoint /mnt,
perform normal Solaris Volume Manager unencapsulation steps:
# vi /mnt/etc/vfstab file mounts for all root partitions,
make sure that they reference the /dev/dsk and /dev/rdsk
# vi /mnt/etc/system file and comment out the below entry
*set md:mirrored_root_flag=1
5. Update boot path in /mnt/boot/solaris/bootenv.rc file: and
change bootpath environment variable to reflect this
"unencapsulated" disk
# vi /mnt/boot/solaris/bootenv.rc
setprop bootpath
'/pci@0,0/pci1022,7458@11/pci1000,3060@4/sd@1,0:a'
setprop altbootpath
'/pci@0,0/pci1022,7458@11/pci1000,3060@4/sd@0,0:a'
NOTE: If you missed this step, when you boot from the mirror
disk, the server will panic panic[cpu0]/thread=fffffffffbc22d40:
cannot mount root pathNOTE: If you are not sure what the physical
path is that belongs
in the above, It is recommended you run the following
command
to identify the physical device path:
ls -la /dev/dsk/c#t#d#s#
6. install a boot block on the unencapsulated disk: (substitute
correct /dev/rdsk... device above)
# installgrub -fm /boot/grub/stage1 /boot/grub/stage2
/dev/rdsk/cxtxdxs0
Updating master boot sector destroys existing boot managers (if
any).
continue (y/n)?y
stage1 written to partition 0 sector 0 (abs 16065)
stage2 written to partition 0, 233 sectors starting at 50 (abs
16115)
stage1 written to master boot sector
7. Update the boot archive in /mnt
# bootadm update-archive -R /mnt
Creating ram disk on /mnt
updating /mnt/platform/i86pc/boot_archive...this may take a
minute
# ls -l /mnt/platform/i86pc/boot_archive (ensure this is a new
module)
8. unmount this disk from /mnt mountpoint before rebooting.
9. Boot from the mirror disk.# shutdown y g0 i6
In some cases the BIOS disk numbering may change, it may be due
to when BIOS configuration is modified. Then you will be unable to
boot from main disk and mirror disk. In such a condition, we need
to check and modify the BIOS boot disk order.
hd0 -> 1st bios disk
hd1 -> 2nd bios disk
Where hd is the GRUB device name for Hard Disk and 0 is the 1st
BIOS disk.If the BIOS disk numbering got changed, when you boot the
server You will get an error message similar like the below
mentioned.root (hd1,0,a)
Filesystem type unknown, partition type 0xbf
kernel /platform/i86pc/multibootError 17: Cannot mount selected
partition
Press any key to continue...REFERANCE
Please go through the below mentioned link, which will explain
"The New Bootloader for x86 Platforms"
http://www.sun.com/bigadmin/features/articles/grub_boot_solaris.jsp
