Generating data set of the first file system by determining a set of changes between data stored in first snapshot of the first file system, and data stored in second snapshot of the first file system
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United States of America Patent
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Oct 25, 2005
Grant Date -
Aug 21, 2003
app pub date -
Feb 15, 2002
filing date -
Feb 15, 2002
priority date (Note) -
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Abstract
A system, method and computer readable medium for providing a standby file system with snapshot feature is disclosed. A first snapshot of a primary file system is generated. Next, a standby file system restores the first snapshot of the primary file system in the standby file system and a snapshot of the standby file system is taken. Then, a second snapshot of the primary file system is taken and a data set capturing the differences between the first snapshot of the primary file system and a previous data set of the primary file system is generated. Subsequently, the data set is applied to the standby file system. Upon unavailability of the primary file system, the standby file system is initialized as the new primary file system. Upon recovery of the old primary file system, the old primary file system is initialized as a new standby file system.
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