Patent ID: 7516248

Claim:
A method for obtaining I/O measurement queue data in a computer system comprising Secondary Queues wherein a secondary queue is a queue of I/O requests that a channel subsystem has begun to process, but is unable to complete because of a busy condition in an I/O configuration, the method comprising: obtaining measurement data, the measurement data related to a plurality of Secondary Queues (logical control unit queues) of a channel subsystem, the measurement data comprising queuing statistics and measurement information for one or more channels attached to the plurality of Secondary Queues; executing a store secondary queue measurement data instruction having a command request block, the command request block comprising information specifying a range of Secondary Queues—of the plurality of Secondary Queues; for each secondary queue of the specified range of Secondary Queues, creating one or more extended secondary measurement blocks, the extended secondary measurement blocks comprising the measurement data; in response to executing the store secondary queue measurement data instruction, storing the created one or more extended secondary measurement blocks at a memory address block directly specified by the store secondary queue measurement data instruction.