Technique for coherent suspension of I/O operations in a RAID subsystem
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United States of America Patent
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Mar 23, 2010
Grant Date -
N/A
app pub date -
Jan 8, 2008
filing date -
Mar 21, 2003
priority date (Note) -
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Abstract
A method for operating a data storage system is described. The method first constructs an I/O tree representing a logical configuration of storage devices coupled to the storage system, the I/O tree representing a flow of I/O operations to the storage devices. Elements of the I/O tree are represented by objects. A freeze condition is imposed on a selected object of the I/O tree in order to disable a portion of the storage devices serviced by the selected object. Configuration management operations are performed on the portion of the storage devices serviced by the selected object. The freeze condition is removed from the selected object in response to completion of the configuration management, in order to resume I/O operations to the portion of the storage devices serviced by the selected object.
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