Pablo P Rodriguez

US Patent:

7085907, Aug 1, 2006

Filed:

Feb 17, 2004

Appl. No.:

10/781467

Inventors:

Kevin J. Ash - Tucson AZ, US
Richard H. Grossman - Tucson AZ, US
Joseph D. Ohrazda - Tucson AZ, US
Pablo A. Rodriguez - Vail AZ, US
Tim S. Vande Zande - Tucson AZ, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 12/00

US Classification:

711170, 714 7

Abstract:

A data storage control unit is coupled to one or more host devices and to one or more physical storage units, the storage control unit configured as a plurality of clusters. Each cluster includes cache memory and often non-volatile storage (NVS). The storage control unit receives and processes write requests from the host devices and directs that data updates be temporarily stored in the cache in one cluster and copied to the NVS of the other cluster. The data updates are subsequently destaged to the logical ranks associated with each cluster. During an initial microcode load (IML) of the storage controller, space in the cache and NVS of each cluster is allocated to buffers with the remaining cache and NVS space being allocated to customer data. After an IML has been completed, the size of the buffers become fixed and no further buffer allocation may occur. Method, apparatus and program product are provided by which a data storage controller dynamically reconfigures NVS and cache memory in multiple clusters, particularly when it is desired to change the size of the NVS and cache of either or both clusters.