Solaris x86: How to boot from Veritas mirror disk?

Hello team,
We are using trailware Veritas Storage Foundation (VxVM) on Solaris 10 x86 system and need help in booting from alternative boot disk(Mirror disk).
Steps did :
1. Mirrored the root disk group using veritas volume manager command *"vxrootmir"*
2. Updated the bootpath with mirror disk path in /boot/solaris/bootenv.rc
Updated the EEPROM information:
# bootadm update-archive -R /a
3. Edited the grub configuration file, /boot/grub/menu.lst
Created the following entry similar to primary disk entry to allow the root disk mirror to be booted
title Oracle Solaris 10 8/11 s10x_u10wos_17b X86 <VxVM: Alternate Boot Disk>
findroot (rootfs0,0,a)
kernel /platform/i86pc/multiboot
module /platform/i86pc/boot_archive
4. reboot -- -r
At the time of boot, selected the newly added entry from the grub list and got the following error,
*"Reboot and select proper boot device or insert boot media in selected device and press a key".*
I am unable to move further from here, is this because of the veritas trial version we are using ?
Please help in resolving this issue and also explain the step by step process of booting from alternative boot disk on a x86 machine.
Let me know if you find anything inappropriate. Looking forward for your replies.
Thanks in advance.

Hi--
I have not seen this message before but a quick google search says that is pretty common and is related to the system
trying to boot from a different device (not the one you intended). Can you check your BIOS settings and possibly remove
devices from the boot order setting... Otherwise, I would suggest running installgrub on the disk that you are trying to boot
from.
I'm curious why you are trying Veritas. Is there a Veritas feature that you need? You might consider trying ZFS if you haven't
already. Its very simple to set up and use.
Thanks, Cindy

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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.
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http://www.solarisinternals.com/wiki/index.php/ZFS_Troubleshooting_Guide#ZFS_Boot_Issues

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please see bellow for detail info,would you like to give me some advise on how to do this?
root@hn-t5220-test # zpool status
pool: rpool
state: ONLINE
scrub: none requested
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rpool ONLINE 0 0 0
mirror ONLINE 0 0 0
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root@hn-t5220-test #
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syncing file systems... done
Program terminated
ChassisSerialNumber BEL0848KRT
SPARC Enterprise T5220, No Keyboard
Copyright 2008 Sun Microsystems, Inc. All rights reserved.
OpenBoot 4.29.0.a, 65408 MB memory available, Serial #85045372.
Ethernet address 0:21:28:11:b0:7c, Host ID: 8511b07c.
{0} ok boot mirrdisk
Boot device: /pci@0/pci@0/pci@2/scsi@0/disk@1,0:a File and args:
SunOS Release 5.10 Version Generic_137137-09 64-bit
Copyright 1983-2008 Sun Microsystems, Inc. All rights reserved.
Use is subject to license terms.
NOTICE:
* This device is not bootable! *
* It is either offlined or detached or faulted. *
* Please try to boot from a different device. *
NOTICE:
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000000000180b950 genunix:vfs_mountroot+358 (800, 200, 0, 18a7c00, 18d1400, 18fa400)
%l0-3: 00000000010d1000 00000000010d0fa0 00000000018ad7b8 00000000011fd800
%l4-7: 00000000011fd800 00000000018fc800 0000000000000600 0000000000000200
000000000180ba10 genunix:main+a0 (182b548, 180c000, 185b240, 18f6c00, 1831948, 182b400)
%l0-3: 000000000101a800 0000000000000001 0000000070002000 0000000000000000
%l4-7: 0000000001862800 0000000000000000 000000000180c000 0000000000000000
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