Booting from a mirrored disk on a zfs root system

Question

Hi all,
I am a newbee here.
I have a zfs root system with mirrored disks c0t0d0s0 and c1t0d0s0, grub has been installed on c0t0d0s0 and OS booting is just fine.
Now the question is if I want to boot the OS from the mirrored disk c1t0d0s0, how can I achieve that.
OS is solaris 10 update 7.
I installed the grub to c1t0d0s0 and assume menu.lst need to be changed (but i don't know how), somehow no luck.
# zpool status zfsroot
pool: zfsroot
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
zfsroot ONLINE 0 0 0
mirror ONLINE 0 0 0
c1t0d0s0 ONLINE 0 0 0
c0t0d0s0 ONLINE 0 0 0
# bootadm list-menu
The location for the active GRUB menu is: /zfsroot/boot/grub/menu.lst
default 0
timeout 10
0 s10u6-zfs
1 s10u6-zfs failsafe
# tail /zfsroot/boot/grub/menu.lst
title s10u6-zfs
findroot (BE_s10u6-zfs,0,a)
bootfs zfsroot/ROOT/s10u6-zfs
kernel$ /platform/i86pc/multiboot -B $ZFS-BOOTFS
module /platform/i86pc/boot_archive
title s10u6-zfs failsafe
findroot (BE_s10u6-zfs,0,a)
bootfs zfsroot/ROOT/s10u6-zfs
kernel /boot/multiboot kernel/unix -s -B console=ttya
module /boot/x86.miniroot-safe
Appreciate anyone can provide some tips.
Thanks.
Mizuki

Answer 1

This is what I have in my notes.... not sure if I wrote them or not. This is a sparc example as well. I believe on my x86 I still have to tell the bios to boot the mirror.
After attaching mirror (if the mirror was not present during the initial install) you need to fix the boot block.
#installboot -F zfs /usr/platform/`uname -i`/lib/fs/zfs/bootblk /dev/rdsk/c0t1d0s0
If the primary then fails you need to set the obp to the mirror:
ok>boot disk1
for example
Apparently there is a way to set the obp to search for a bootable disk automatically.
Good notes on all kinds of zfs and boot issues here:
http://www.solarisinternals.com/wiki/index.php/ZFS_Troubleshooting_Guide#ZFS_Boot_Issues