Mass storage controller with apparatus and method for extending battery backup time by selectively providing battery power to volatile memory banks not storing critical data
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United States of America Patent
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Feb 17, 2009
Grant Date -
Sep 21, 2006
app pub date -
Mar 15, 2005
filing date -
Mar 15, 2005
priority date (Note) -
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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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