Point in time copy between data storage systems
First Claim
1. An information handling system for providing a point in time copy of data between a source data storage system and a target data storage system, comprising:
- a peer-to-peer communication link interface of said target data storage system for linking said target data storage system to said source data storage system;
data storage of said target data storage system for storing point in time copy data received from said source data storage system via said peer-to-peer communication link interface;
a table of said target data storage system establishing information relating logical identification of said point in time copy data to point in time copy data stored at said target data storage system and to point in time copy data stored at said source data storage system, such that said information of said table may reference the one of said data storage systems having requested point in time copy data; and
a controller of said target data storage system accessing requested point in time copy data at said target data storage system if said information of said table indicates that said requested point in time copy data is available at said target data storage system;
else obtaining said requested point in time copy data from said source data storage system via said peer-to-peer communication link interface.
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Accused Products
Abstract
A target data storage system comprises a peer-to-peer communication link interface for linking the target to a source data storage system, and data storage for storing point in time copy data received from the source via the peer-to-peer communication link interface. Information is established at the target relating logical identification of the point in time copy data to point in time copy data stored at the target and to point in time copy data stored at the source, such that the information references the data storage system having requested point in time copy data. A controller of the target accesses requested point in time copy data at the target if the table indicates that the requested point in time copy data is available at the target; else obtains the requested point in time copy data from the source via the peer-to-peer communication link interface.
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Citations
30 Claims
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1. An information handling system for providing a point in time copy of data between a source data storage system and a target data storage system, comprising:
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a peer-to-peer communication link interface of said target data storage system for linking said target data storage system to said source data storage system; data storage of said target data storage system for storing point in time copy data received from said source data storage system via said peer-to-peer communication link interface; a table of said target data storage system establishing information relating logical identification of said point in time copy data to point in time copy data stored at said target data storage system and to point in time copy data stored at said source data storage system, such that said information of said table may reference the one of said data storage systems having requested point in time copy data; and a controller of said target data storage system accessing requested point in time copy data at said target data storage system if said information of said table indicates that said requested point in time copy data is available at said target data storage system;
else obtaining said requested point in time copy data from said source data storage system via said peer-to-peer communication link interface. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A controller of a data storage system, said data storage system comprising a target data storage system comprising:
- a peer-to-peer communication link interface for linking said target data storage system to a source data storage system; and
data storage for storing point in time copy data received from said source data storage system via said peer-to-peer communication link interface;
said controller;managing information relating logical identification of said point in time copy data to point in time copy data stored at said target data storage system and to point in time copy data stored at said source data storage system, such that said information may reference the one of said data storage systems having requested point in time copy data; and accessing requested point in time copy data at said target data storage system if said information indicates that said requested point in time copy data is available at said target data storage system;
else obtaining said requested point in time copy data from said source data storage system via said peer-to-peer communication link interface. - View Dependent Claims (8, 9, 10, 11, 12)
- a peer-to-peer communication link interface for linking said target data storage system to a source data storage system; and
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13. A computer program product usable with at least one programmable computer processor having computer readable code embodied therein, said at least one programmable computer processor for providing a point in time copy of data between a source data storage system and a target data storage system;
- said target data storage system comprising;
a peer-to-peer communication link interface for linking said target data storage system to a source data storage system; and
data storage for storing point in time copy data received from said source data storage system via said peer-to-peer communication link interface;
said computer program product comprising;computer readable program code causing said at least one programmable computer processor to manage information relating logical identification of said point in time copy data to point in time copy data stored at said target data storage system and to point in time copy data stored at said source data storage system, such that said information may reference the one of said data storage systems having requested point in time copy data; and computer readable program code causing said at least one programmable computer processor to access requested point in time copy data at said target data storage system if said information indicates that said requested point in time copy data is available at said target data storage system;
else to obtain said requested point in time copy data from said source data storage system via said peer-to-peer communication link interface. - View Dependent Claims (14, 15, 16, 17, 18)
- said target data storage system comprising;
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19. An information handling system, comprising:
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a source data storage system for providing a point in time copy of data;
said source data storage system comprising;data storage for storing said point in time copy data; a controller for managing said point in time copy data; and a peer-to-peer communication link interface; and a target data storage system for providing access to data of said point in time copy, said target data storage system comprising; a peer-to-peer communication link interface for linking said target data storage system to peer-to-peer communication link interface of said source data storage system; data storage for storing point in time copy data received from said source data storage system via said peer-to-peer communication link interface; a table establishing information relating logical identification of said point in time copy data to point in time copy data stored at said target data storage system and to point in time copy data stored at said source data storage system, such that said information of said table may reference the one of said data storage systems having requested point in time copy data; and a controller accessing requested point in time copy data at said target data storage system if said information of said table indicates that said requested point in time copy data is available at said target data storage system;
else obtaining said requested point in time copy data from said source data storage system via said peer-to-peer communication link interfaces. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A method for providing a point in time copy of data between a source data storage system and a target data storage system;
- said target data storage system comprising;
a peer-to-peer communication link interface for linking said target data storage system to a source data storage system; and
data storage for storing point in time copy data received from said source data storage system via said peer-to-peer communication link interface;
said method comprising the steps of;establishing at said target data storage system information relating logical identification of said point in time copy data to point in time copy data stored at said target data storage system and to point in time copy data stored at said source data storage system, to reference the one of said data storage systems having requested point in time copy data; accessing requested point in time copy data at said target data storage system if said established information indicates that said requested point in time copy data is available at said target data storage system; else, obtaining said requested point in time copy data from said source data storage system to said target data storage system via said peer-to-peer communication link interface. - View Dependent Claims (26, 27, 28, 29, 30)
- said target data storage system comprising;
Specification