International Business Machines Corporation

Jeffery Michael Barnes

Matthew J Kalos

Susan Kay Candelaria

James Chien-Chiung Chen

Minh-Ngoc Le Huynh

Brian Jeffrey Corcoran

Nicholas D Fifer

Frederick James Carberry, Ii

Edwin K Scott

A computer storage system includes a supervisor algorithm to detect a host computer's initiator logging in. The supervisor algorithm identifies data storage devices associated with the newly logged-on initiator and tags logical unit number control blocks ('LUNCBs') as having priority in an initiation process. The supervisor algorithm assigns a task control block to each of the identified data storage devices and invokes a logical unit number ('LUN') initialization algorithm. If the supervisor algorithm was invoked during an initial microcode load (&#x201c;IML&#x201d;) event, the LUN initialization algorithm initializes each of the identified data storage devices. However, if the supervisor algorithm was invoked during a warmstart procedure, the LUN initialization algorithm first checks to make sure the LUNCB was not mistakenly written too. If not, the LUN initialization algorithm terminates without initializing the associated data storage device. Otherwise, the associated data storage device is initialized and the LUN initialization algorithm terminates.

Priority initialization system

Disclosed is a technique for throttling data transfer. An amount of resources that are in use is determined. When the amount of resources reaches a high threshold, one or more primary control units are notified to temporarily stop sending data. When the amount of resources reaches a low threshold, each previously notified primary control unit is notified to resume sending data.

Method, system, and program for throttling data transfer

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Tucson, AZ, United States of America

Jeffery Michael Barnes