Appeal No. 1998-1517 Page 7
Application No. 08/685,269
or RAID area of the disk array which stores data according to
a first or mirror level redundancy, i.e., a RAID level 1. The
mirror redundancy is diagrammatically represented by the three
pairs of disks 20 in Figure 1. Original data can be stored on
a first set of disks 26, while duplicated, redundant data is
stored on the paired second set of disks 28. Disks 24 of
parity group 22 represent a second memory location or RAID
area in which data is stored in a second redundancy area, such
as a RAID level 5. Original data is stored on five disks 30
and redundant parity data is stored on sixth disk 32.
Jacobson further discloses (col. 4, lines 32-40) that
The disk arrangement of Fig. 1 is provided for
conceptual purposes. In practice, disk array 10 would
simply have a plurality of disks 12 which are capable
of storing data according to mirror and parity
redundancy. Among the available storage space provided by
all disks 12, a portion of that disk space would be
allocated for mirror redundancy and another portion would
be allocated for parity redundancy. Preferably, disks 12
are configured to contain plural, equal sized storage
regions . . ..
In addition, Jacobson discloses (Figure 4 and col. 5, lines
28-34) that physical storage space 34 is referenced by a
virtual storage space, and that disks 1-3 have approximately
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