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Obtaining extended queue measurement data for a range of logical control unit queues

  • US 7,516,248 B2
  • Filed: 12/28/2007
  • Issued: 04/07/2009
  • Est. Priority Date: 05/12/2003
  • Status: Expired due to Term
First Claim
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1. 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.

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