DS15 not booting after mirror disk replacement

[Saju a r s]

Hi ,
I have a problem in which DS15 is not booting after a mirror disk replacement.
Here are the boot errors when i boot from halt prompt:
lsm:new_disk: Cannot open disk dsk7b
WARNING: Disk dsk7b in group rootdg: Disk device not found

dsk7 is the replaced disk .
Pls help !!

[zouhaier]

Hi,
You did a huge mistake. your system is LSM configured so far, you had to split off the root mirror volume through the command "volunroot" and reintroduce the newly replaced disk via the "volrootmir" command. The boot message tells you that disk dsk7b is unknown in the actual LSM configuration.
Regards.