Mirror split brain avoidance
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United States of America Patent
Stats
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Nov 15, 2011
Grant Date -
N/A
app pub date -
Jun 19, 2008
filing date -
Mar 21, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A data storage system has two computers. Each computer is assigned to a set of data. Two copies of each set of data are maintained. A first copy is stored on a first set of disks and a second copy is stored on a second set of disks. Each time that a data is written by a computer, a label is written to each set of disks, the label having fields for a status of each computer, a first ordinal which is increased each time that a new data is written, and a time stamp giving a time at which the last write was performed. After failure of a computer, a processor determines, in response to reading the labels of the first set of disks and the second set of disks, the most up to date copy of the data assigned to the failed computer.
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