International Business Machines Corporation

Tim F McCarthy

Jonathan Ian Settle

Jonathan W L Short

Roderick G C Moore

Roderick G Moore

Denis Senin

Dan Critchley

Jon Short

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.

Latency measurement in an I/O operation of computer data storage

A method and system for enforcing routing in Fibre Channel Arbitrated Loop (FCAL) switch define a message route for an initiator to initiator message in a FCAL network. The message route is for the initiator to initiator message to traverse each selected switch device in the FCAL network. If the message received is an initiator to initiator message, the system and method force the message that is initiator to initiator message to adapt the defined message route. In this way, the initiator to initiator traffic is forced to traverse identified links in a switched network and can identify issues and problems associated in each of the links.

Enforced routing in switch

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Hampshire, United Kingdom

Tim F McCarthy