International Business Machines Corporation
Latency measurement in an I/O operation of computer data storage

Abstract:

A method and a computer program product for latency measurement in an I/O operation. A storage system measures time periods taken in a write I/O operation and, using the measures time periods in the write I/O operation, the storage system monitors a delay that is caused by at least one of a host and a storage area network. A storage system measures time periods taken in a read I/O operation and, using the measures time periods in the read I/O operation, the storage system monitors a delay that is caused by at least one of a host and a storage area network in the read I/O operation.