Write journaling using battery backed cache
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United States of America Patent
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May 12, 2009
Grant Date -
Mar 8, 2007
app pub date -
Sep 7, 2005
filing date -
Sep 7, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A system, apparatus and method for maintaining information related to a write operation is described. In one embodiment of the invention, a write journal is provided that contains a list of entries that store information related to active write operations so that a particular write may be restarted in order to correct an inconsistency. The journal may have a battery backed cache, in which data is stored prior to writing to a disk, which is provided power in the case of a power failure. The journal may be located in memory positioned at various locations within a system including on a controller card for a disk array system or on a motherboard of a host system.
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