Managing shared devices in a data processing system
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United States of America Patent
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Nov 19, 2002
Grant Date -
N/A
app pub date -
Apr 20, 1999
filing date -
Apr 20, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
Disclosed is a method and device adapter for managing devices in a data processing system that includes a plurality of device adapters connected for independent communication with at least one shared device (e.g. disk data storage device). The method comprises the steps of: issuing a command from a first of the plurality of adapters to the at least one shared device; setting, in the first adapter, first and second timeouts associated with the command; on expiration of the first timeout value, issuing a message from said first adapter to other(s) of the plurality of adapters to request the other adapter(s) to notify the first adapter of any work requested of the shared device by the other adapter(s); and on expiration of the second timeout value, initiating a recovery operation in the data processing system.
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