The shadowing software
detects boot attempts from a physical disk that is inconsistent with
currently active shadow set members. In this case, the boot attempt
detects the existence of the other shadow set members and determines
(using the information in the SCB) that the boot device is not a valid
member of the shadow set. When this occurs, the boot attempt fails
with a SHADBOOTFAIL bugcheck message on the system console, and a
dump file is written to the boot device.
The system bugchecks because it can boot only from a currently valid
member of the system disk shadow set. If the boot device fails out
of or is otherwise removed from the system disk shadow set, you must
either mount the boot device back into the shadow set (and wait for
the copy operation to complete) or modify the boot command file to
boot from a current shadow set member.