Patent ID: 6539495
Filing Date: 2003-03-25
Classification: G06F

Abstract:
A duplexing method comprising:writing data to a primary instance of a data structure; and selectively writing a portion of said data to a secondary instance of said data structure, wherein said secondary instance is usable as a copy of said primary instance, but contains less data than said primary instance, and wherein said selectively writing is initiated automatically, the automatic initiation of said selectively writing being based upon at least one predefined event, and wherein said at least one predefined event comprises one or more of the following: reversion of said data structure from a duplex mode to a simplex mode, in which duplex mode is desired; one or more resources needed for said selectively writing becomes available; and disconnection of one or more users that do not support writing to both of said primary instance and said secondary instance, such that only users that support writing to both of said primary instance and said secondary instance are connected to said primary instance.