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AssigneeInternational Business Machines Corporation
InventorsBeth Ann Peterson, Patricia G. Driever, Dale F. Riedy, John R. Paveza, Roger G. Hathorn, Wayne Erwin Rhoten
Estimating the term…
Provided are a computer program product, system, and method for processing request directed through a channel subsystem to a storage server. In one embodiment, a pattern search request is embedded in a Device Command Word (DCW) which allows the storage server to do all or substantially all of the search and comparison work in response to as few as a single DCW from the host. In addition, I/O processing can be enhanced to use the target record of interest of a successful embedded pattern search request as the starting point for read/write I/O processing, all in response to as few as a single DCW. Still further, orientation rules can also be relaxed such that once a target record is found, any and all fields of the record can be accessed and utilized in execution of subsequent commands of the initial or subsequent DCWs of the chain.
A computer program product for processing requests to a storage system, wherein the computer program product comprises a computer readable storage medium having program instructions embodied therewith, the program instructions executable by a processor to cause operations, the operations comprising packaging a pattern search request in a device command word (DCW) for DCW transport mode processing in a channel subsystem for the storage system, the pattern search request packaging including packaging in the device command word, a key search pattern argument for the pattern search request so that the DCW has an embedded pattern search request having a key search pattern argument.
A computer system, comprising:
A method, comprising:
A computer program product for processing requests in a storage system, wherein the computer program product comprises a computer readable storage medium having program instructions embodied therewith, the program instructions executable by a processor to cause operations, the operations comprising receiving a device command word (DCW) for DCW transport mode processing in a channel subsystem for the storage system, the DCW having a pattern search request embedded within PFX/PFXR parameters in the device command word (DCW), and a read/write Channel Command Word (CCW) embedded in the DCW, the pattern search request having packaged in the device command word, an embedded key search pattern argument;
Dependencies are inferred from the claim text.