Importance

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Abstract

Method, appartus and program products for persistent cache synchronization for communications over an external communication link between a client protocol conversion application executing on a first computer and a server protocol conversion application executing on a second computer located remote from the first computer are provided. Protocol conversion applications are provided on both the host side and the terminal side of the external communication link to provide communications over the external communication link using a differenced communication data stream which includes a reduced volume of data for transmittal. A checkpoint is provided to allow for improved performance on start up of a new communication session over the external communication link between the client application and the server application by initiating a checkpoint request and transmitting the request from the client to the server. The active protocol cache of the server is copied to a checkpoint cache responsive to a received checkpoint request. A checkpoint confirmation message is sent to the client from the server. Responsive to receipt of a checkpoint confirmation message indicating successful copying of the server active protocol cache to a checkpoint cache, the client application creates a checkpoint cache of the first computer as a copy of the protocol cache of the first computer. The first computer creates a checkpoint cache by first creating a temporary cache before initiating the checkpoint and on receipt of a confirmation from the server, converting the temporary cache to a confirmed checkpoint cache.

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First Claim