Here is how to replace a failed boot disk having a software mirror on it (on a Solaris box): Replacing a failed boot disk

I was stuck with a dead HDD0 on a Sun T2000 box. The HDD1 was mirrored with HDD0 but someone did not put a boot block on it. Hence the system would not boot from HDD1. I tried putting a boot block on HDD1 but it threw the system into a panic mode while trying to boot up from HDD1 I found this useful webpage which describes how to boot from a Solaris OS CD ROM disk and perform necessary work Performing maintenance when booted from cdrom