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Load balancing of destage operations in a N way, write cache, disk subsystem

IP.com Disclosure Number: IPCOM000014097D
Original Publication Date: 2001-Mar-01
Included in the Prior Art Database: 2003-Jun-19

Publishing Venue

IBM

Abstract

A program is disclosed which improves the performance of a multi host or multi adapter disk subsystem that uses write caching. Destage operations are required in such a system, and this invention ensures that the destage operations are carried out by the most lightly loaded adapters in the system. This helps to maximise the overall performance of the system. Background Figure 1 shows a typical, 2 way disk system, in which 2 hosts are able to read and write data to a number of shared