Electrical computers and digital processing systems: memory – Addressing combined with specific memory configuration or... – For multiple memory modules
Reexamination Certificate
2005-03-15
2009-02-17
Bragdon, Reginald G (Department: 2189)
Electrical computers and digital processing systems: memory
Addressing combined with specific memory configuration or...
For multiple memory modules
C711S113000, C711S114000, C365S229000
Reexamination Certificate
active
07493441
ABSTRACT:
A battery-backed write-caching mass storage controller is disclosed. The controller includes a plurality of volatile memory banks for caching write data prior to being written to disk drives. Critical data is stored into a first subset of the memory banks, leaving a second subset of memory banks storing only non-critical data. Critical data is data that must be retained during a main power loss to avoid loss of write-cached user data. Critical data includes the write-cached user data itself, as well as metadata describing the write-cached user data. When the controller detects a loss of main power, the controller causes the critical memory banks to receive battery power, but disables battery power to the non-critical memory banks in order to extend the length of time the critical memory banks can continue to receive battery power to reduce the likelihood of user data loss.
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Bragdon Reginald G
Davis E. Alan
Dot Hill Systems Corporation
Mackall Larry T
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