US 2019/0102264 A1Published application

Data storage system comprising primary and secondary storage systems

AssigneeInternational Business Machines Corporation

InventorsIan Boden, John P. Agombar, Gordon Hutchison, Lee J. Sanders

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Abstract

Data is stored on a primary storage system and a copy of the data is stored on a secondary storage system. A determination is made that a connection between the systems is currently unavailable. Location data is maintained that identifies where changes have been made to the primary storage system while the connection is unavailable. Another determination is made that data has been lost at the secondary storage system. Recovery data required to repair the lost data is identified. Another determination is made that the connection to the secondary storage system is now available. The location data is updated with the locations of the recovery data. The secondary storage system is updated with data from the primary storage system as defined by the location data.

Claims15

Dependent claims

A method of operating a data storage system comprising a primary storage system and a secondary storage system connected to the primary storage system, the method comprising:

storing a set of data on the primary storage system;
storing a copy of the set of data on the secondary storage system;
determining that a connection from the primary storage system to the secondary storage system is currently unavailable;
maintaining location data identifying where changes have been made to the primary storage system while the connection to the secondary storage system is unavailable;
determining that data has been lost at the secondary storage system;
identifying recovery data required to repair the data that has been lost at the secondary storage system;
determining that the connection to the secondary storage system is now available;
updating the location data with locations of the recovery data required to repair the data that has been lost at the secondary storage system;
and
updating the secondary storage system with data from the primary storage system as defined by the location data.

7 more elements

A data storage system comprising a primary storage system and a secondary storage system connected to the primary storage system, the data storage system arranged to:

store a set of data on the primary storage system;
store a copy of the set of data on the secondary storage system;
determine that a connection from the primary storage system to the secondary storage system is currently unavailable;
maintain location data identifying where changes have been made to the primary storage system while the connection to the secondary storage system is unavailable;
determine that data has been lost at the secondary storage system;
identify recovery data required to repair the data that has been lost at the secondary storage system;
determine that the connection to the secondary storage system is now available;
update the location data with the locations of the recovery data required to repair the data that has been lost at the secondary storage system;
and
update the secondary storage system with data from the primary storage system as defined by the location data.

7 more elements

A computer program product for controlling a data storage system comprising a primary storage system and a secondary storage system connected to the primary storage system, the computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions executable by a processor to cause the processor to perform a method comprising:

storing a set of data on the primary storage system;
storing a copy of the set of data on the secondary storage system;
determining that a connection between primary storage system and the secondary storage system is currently unavailable;
maintaining, responsive to the unavailability determination, location data identifying where changes are being made to the set of data stored on the primary storage system while the connection is unavailable;
determining that a portion of the copy of the set of data has been lost at the secondary storage system;
identifying recovery data required to repair the portion that has been lost at the secondary storage system;
determining that the connection is reestablished;
updating, responsive to the reestablishment determination, the location data with locations of the recovery data required to repair the portion that has been lost at the secondary storage system;
and
updating the secondary storage system with data from the primary storage system as defined by the updated location data.

7 more elements

Dependencies are inferred from the claim text.