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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Feb 5, 2008
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N/A
app pub date -
Mar 21, 2003
filing date -
Mar 21, 2003
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Abstract
A technique coherently suspends input/output (I/O) operations in a RAID subsystem of a storage system. A configuration tree of the RAID subsystem has a plurality of objects representing a logical configuration of storage devices coupled to the system. According to the technique, a 'freeze' condition may be imposed on an object of the configuration tree to suspend I/O operations directed to that object. In order to freeze, I/O operations underway ('in flight') in the RAID subsystem and directed to the object need to complete sufficiently so as to reach a recoverable state in the event the subsystem subsequently fails prior to an I/O restart procedure. Once a freeze condition has been imposed, new I/O requests directed to the object are inserted onto a freeze list of pending requests at the RAID subsystem and are blocked from processing until the object is 'unfrozen' (i.e., the freeze condition is lifted).
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