International Business Machines Corporation

Edgar Xavier Somoza

Gregory E McBride

Theresa Mary Brown

Carol Santich Mellgren

Juan A Coronado

Joshua J Crawford

Nicolas Marc Clayton

Theodore Timothy Harris, Jr

Nedlaya Yazzie Francisco

Sara Megan Coronado

Jennifer Shinobu Shioya

Damian Trujillo

Withdrawal of a point-in-time snap copy relationship or a portion of such a relationship, is managed in a manner which can obviate disruption of consistency groups due to the withdrawal. If the withdrawal request is directed to a subrange of the original snap copy relationship, the snap copy relationship is split by creating one or more point-in-time snap copy relationships over one or more subranges of tracks of the snap copy source. A determination is made as to whether to delay execution of the withdrawal request to temporarily preserve data of the withdrawal range. Disruptions to completion of consistency groups may be avoided by selectively delaying the withdrawal of a snap copy relationship corresponding to the withdrawal subrange. In so far as the host is involved, a host may treat the withdrawal request as immediately granted without delay. Other aspects may be realized, depending upon the particular application.

Point-in-time snap copy withdrawal management

A main data storage system has a main computer-implemented storage control and data storage, and a user interface, the main storage control in communication with a local computer-implemented storage control of a local data storage system with local data storage. In response to a request to increase data storage from the user interface, the main storage control determines whether the main data storage is out of space. If so, the main storage control sends a command to the local storage control to create data space in local data storage. The local storage control creates the data space and associates the data space with the main storage control; and, in response to a command from the user interface to rebalance data storage, the local storage control sends the command to the main storage control to search for storage space sufficient for the data space in the main storage.

Obtaining additional data storage from another data storage system

A main data storage system has a main computer-implemented storage control and data storage, and a user interface, the main storage control in communication with a local computer-implemented storage control of a local data storage system with local data storage. In response to a request to increase data storage from the user interface, the main storage control determines whether the main data storage is out of space. If so, the main storage control sends a command to the local storage control to create data space in local data storage. The local storage control creates the data space and associates the data space with the main storage control; and, in response to the local storage control creating data space in the local data storage and notifying the main storage control, the main storage control updates its metadata with respect to the data space.

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Tucson, AZ, United States of America

Edgar Xavier Somoza