Patent ID: 6442551
Filing Date: 2002-08-27
Classification: G06F,Y10S

Abstract:
A system for controlling access to a data set by first and second applications wherein the data set is stored in a first data storage facility that is addressable by the first application, said system comprising:A) a second data storage facility configured to correspond to the first data storage facility, B) first command responsive means responsive to a first command for establishing, independently of operations in response to the first application, a copy of the data set in said second data storage facility as a mirror for the first data storage facility by attaching said second data storage facility in parallel with the first data storage facility, and C) second command responsive means responsive to a second command for detaching said second data storage facility from the first data storage facility independently of operations in response to the first application thereby terminating the memory mirror function of said second data storage facility and attaching said second storage facility to be addressed by the second application whereby the first and second applications thereafter can access the data sets in the first and said second data storage facilities respectively and concurrently, and D) third command responsive means responsive to a third command for terminating the operation of said second Command responsive means.