Method, system and article of manufacture for recovery from a failure in a cascading PPRC system
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United States of America Patent
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Mar 31, 2009
Grant Date -
Mar 15, 2007
app pub date -
Nov 2, 2006
filing date -
Sep 29, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of recovery from a data storage system failure in a data storage system having a host computer writing data to a first storage unit with a first storage controller synchronously mirroring the data to a second storage unit, and with a second storage controller asynchronously mirroring the data to a third storage unit. Upon detection of an error or failure associated with the first storage unit, the synchronous data mirroring relationship between the first storage unit and the second storage unit is terminated and the host is directed to write data updates directly to the second storage unit. Upon correction of the failure associated the asynchronous mirroring of data updates from the second storage unit to the third storage unit is suspended and synchronous mirroring of the data updates in a reverse direction, from the second storage unit to the first storage unit, is commenced.
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