Appeal 2007-1352
Application 10/406,127
FINDINGS OF FACT
The record supports the following findings of fact (FF) by a
preponderance of the evidence.
1. Duprey describes a remote mirroring system in which a master storage
unit 130 stores information in a log and uses that information to
resynchronize slave images stored in slave storage units 1401 through
140N by copying only those portions of the master image indicated in
the log to the slave images. (Abstract; col. 2, l. 67 to col. 3, l. 13; col.
5, ll. 50-55; Fig. 1.) Figure 2 shows exemplary storage units, such as
the master storage unit 130 and slave storage units 1401 through 140N.
(Col. 3, ll. 29-31; col. 5, ll. 64-67; col. 6, ll. 8-61.) Figure 3 shows
relevant blocks of the storage processor 204, 208 shown in Figure 2,
including a write cache. (Col. 3, ll. 32-34; col. 6, ll. 62-67.)
2. Duprey teaches that the master storage unit 130 maintains a "write
intent log" that identifies portions of the slave images stored on slave
storage units 1401 through 140N that may be unsynchronized. (Col. 4,
ll. 5-8; col. 5, ll. 50-55; Fig. 1.) The write intent log is maintained so
as to survive a failure and be available to the master storage unit 130
following a failure. (Col. 4, ll. 8-112.) After a failure, the master
storage unit 130 resynchronizes the slave images by resynchronizing
only those portions of the slave images that may be unsynchronized.
(Col. 4, ll. 11-26.)
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