Multiple I/O path selection among disparate channel paths
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United States of America Patent
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Dec 6, 2005
Grant Date -
Apr 3, 2003
app pub date -
Sep 28, 2001
filing date -
Sep 28, 2001
priority date (Note) -
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Abstract
An apparatus, method and program product for selecting paths between a main memory and I/O devices in a data processing system having a main memory for storing data, one or more I/O devices for receiving data from or sending data to the main memory, and an I/O processor (IOP) for controlling I/O operations for sending data between the main memory and the I/O devices. The data processing system includes disparate channels between the IOP and the I/O devices. The disparate channels carry data between the main memory and the I/O devices during the I/O operations. Included is a computer program executed by the IOP for assigning a path weight to selected ones of the disparate channel paths to be used in selecting the next channel path to carry data between the main memory and I/O devices. Each disparate channel type has a different set of criteria for evaluating the path weight.
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