Solaris 11 boot failure from second disk in rpool

Hello experts,

I have a M5000 with Solaris 11.1.  I have 4 internal disks (disk0, disk1, disk2, disk3).  the server was built with disk2 and, disk1 was attached to it to mirror rpool.  I detached the disk2 and, attached disk0 to have all of the boot disks from c0t5.  When I try to boot from disk0 I, get the following message at the OK> prompt

Rebooting with command: boot disk -s

Boot device: /pci@0,600000/pci@0/pci@8/pci@0/scsi@1/disk@0  File and args: -s

detached mirror

Can't mount root

ERROR: FCode Aborted.

Evaluating:

The file just loaded does not appear to be executable.