Appeal No. 1999-2216
Application 08/805,399
some question in our minds whether the main memory 12 in
Shinjo can be considered a "local loadsource direct access
storage device." A "local loadsource DASD[] contains system
code utilized to perform initial program load (IPL) of the
computer system" (specification, p. 2, lines 21-22). Main
memory 12 in Shinjo only stores the results of an IPL (the
boot process of steps S4 and S5) using programs and data
from the disk unit 16; it is not a source of programs used
to perform an IPL. Thus, it would seem that disk unit 16
best corresponds to a loadsource DASD. Since this issue is
not argued, we assume main memory 12 is the local loadsource
DASD and backup memory 13 is the remote loadsource DASD.
We start by considering Shinjo at the point where the
saving mode has already occurred, i.e., there has been a
normal boot (steps S4 and S5), the contents of main
memory 12 have been copied (mirrored) to backup memory 13
and the backup flag 15 has been set (step S8), and the
system has been rebooted. Now we assume there has been a
failure in the main memory, such as a power loss or
catastrophic damage, that requires a system boot (the same
thing as an IPL). We assume, because it has not been
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