> BOOT DEVICE: /pci@1f, 4000/scsi@3/disk@6,0:f File ans args" -F cprboot

^^^^^^^^^
It looks as if the machine powered down due to power saving kicking in, or
a sys-suspend was issued. In any case the CPR file can't be found (basically
the system
state saved to disk). Are you sure that you replaced the disks in the same
locations? You
should be able to reboot by dumping the console to OBP (Stop-A on a Sun
keyboard, or
interrupt signal via dumb terminal ). Boot to single user mode and remove
any residual
CPR files;

ok boot -s

.... login as root ....

# rm /.CPR
# rm /.cpr_default
# init 6

Regards,
Andrew