Electrical computers and digital data processing systems: input/ – Input/output data processing – Input/output command process
Patent
1998-02-02
2000-03-21
Lee, Thomas C.
Electrical computers and digital data processing systems: input/
Input/output data processing
Input/output command process
710 3, 710 5, 711 4, G06F 1300
Patent
active
060413662
ABSTRACT:
The present invention is a system, method, and computer readable medium for dynamically specifying one or more attributes for an I/O transaction, or group of I/O transactions. There are situations where it is advantageous to allow a process (i.e. user or application) to dynamically change I/O attributes, such as the primary mirror and scheduling type, for a single I/O operation or for groups of I/O operations. The present invention allows a process to request a particular attribute (e.g., a primary mirror or a scheduling type, such as parallel or sequential) or set of attributes for an I/O transaction. If the dynamically requested attribute or attributes are available, they are used to complete the I/O transaction. If any requested attributes are not available, a default attribute or attributes are used, so that the I/O transaction completes. One or more attributes may be dynamically requested, and the dynamically requested attributes may be in effect for a single I/O transaction, for a specified group of I/O transactions, or until the attributes are re-requested. I/O attributes may be dynamically changed while the system is executing, without having to shut down the system or the I/O sub-system.
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Maddalozzo, Jr. John
McBrearty Gerald Francis
Shieh Johnny Meng-Han
Cao Chun
International Business Machines - Corporation
Lee Thomas C.
Tyson Thomas E.
Van Leeuwen Leslie A.
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