International Business Machines Corporation

Irit Dolev

Aviad Zlotnick

Gail Andrea Spear

Olympia Gluck

William Frank Micka

Michael Edward Factor

Warren Keith Stanley

Shachar Fienblit

Thomas Charles Jarvis

Robert Francis Bartfai

Sam Clark Werner

Martin Tross

Gilad Sharaby

Akram Bitar

A method for synchronizing data storage systems is provided. The method comprises designating a relationship between a first data storage system and a second data storage system, such that data stored in the first data storage system is copied to the second data storage system, in response to determining that the data stored in the first data storage system has been modified; receiving a first request to modify data stored in a first data block of a first storage volume in the first data storage system, wherein the data block is modified according to the first request; determining that the first data block has not been successfully synchronized when the modified data stored in the first data block is not copied to the second data storage system; and executing a process to retry synchronization of the first data block until synchronization of the first data block is successful, without suspending the relationship while the process is executed.

Synchronizing data storage systems in a data storage environment

For a technique for maintaining consistency of data, one or more blocks of data identified by a first structure are copied to form a consistent set of data. While not acknowledging completion of write requests to any blocks of data, a second structure is created, wherein the second structure indicates which blocks of data are modified while the consistent set of data is being formed.

Method, system, and program for asynchronous copy

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Haifa, Israel

Irit Dolev