James C Mccarty

US Patent:

6880052, Apr 12, 2005

Filed:

Mar 26, 2002

Appl. No.:

10/106906

Inventors:

Clark Lubbers - Colorado Springs CO, US
Susan Elkington - Colorado Springs CO, US
Randy Hess - Colorado Springs CO, US
Stephen J. Sicola - Palmer Lake CO, US
James McCarty - Colorado Springs CO, US
Anuja Korgaonkar - Colorado Springs CO, US
Jason Leveille - Colorado Springs CO, US

Assignee:

Hewlett-Packard Development Company, LP - Houston TX

International Classification:

G06F012/00

US Classification:

711162, 711 6, 711114, 714 6

Abstract:

A storage area network (SAN) controller and method for storing and replicating data between sites in a storage area network in which storage controllers at each site implement storage virtualization. A storage cell is implemented at each site comprising at least one storage controller and a pool of physical storage coupled to the controller. A copy set comprising a logical unit (LUN) of storage, referred to as a member, in each of the storage cells is defined. As operational data transactions are performed against one of the members of a copy set, they are replicated, immediately or after a delay, in each other member of the copy set. As changes are made to dependent attributes such as size of one member of the copy set, the change is replicated in each other member of the copy set automatically. Changes can be made in the independent attributes such as size of each member of the copy set independently of other members of the copy set.

US Patent:

6928513, Aug 9, 2005

Filed:

Mar 26, 2002

Appl. No.:

10/106814

Inventors:

Clark Lubbers - Colorado Springs CO, US
Susan Elkington - Colorado Springs CO, US
Randy Hess - Colorado Springs CO, US
Stephen J. Sicola - Palmer Lake CO, US
James McCarty - Colorado Springs CO, US
Anuja Korgaonkar - Colorado Springs CO, US
Jason Leveille - Colorado Springs CO, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

G06F012/16

US Classification:

711114, 711203, 711112, 711161, 711162, 714 19, 714 20, 714 15

Abstract:

A data storage system adapted to maintain redundant data storage sets at a destination location(s) is disclosed. The data storage system establishes a copy set comprising a source volume and a destination volume. Data written to a source volume is automatically copied to the destination volume. The data storage system maintains a data log that may be activated when the destination volume is inaccessible due to, for example, a malfunction in the destination storage system or in the communication link between the source system and the destination system. I/O commands and the data associated with those commands are written to the data log, and after a destination system becomes available the information in the data log is merged into the destination volume to conform the data in the destination volume to the data in the source volume. The data log competes for disk capacity with other volumes on the system, and log memory is allocated as needed. Command entries and data entries are stored in distinct areas of the data log, and the command entries include information identifying the memory offset of the associated data entries.

US Patent:

6934826, Aug 23, 2005

Filed:

Mar 26, 2002

Appl. No.:

10/106904

Inventors:

Clark Lubbers - Colorado Springs CO, US
Susan Elkington - Colorado Springs CO, US
Randy Hess - Colorado Springs CO, US
Stephen J. Sicola - Palmer Lake CO, US
James McCarty - Colorado Springs CO, US
Anuja Korgaonkar - Colorado Springs CO, US
Jason Leveille - Colorado Springs CO, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

G06F012/00

US Classification:

711170, 714 6, 714 19

Abstract:

Methods for allocating memory for logging data written by a host computer to a source virtual disk and for managing memory allocated to a data log, in a data storage system adapted to maintain redundant data storage sets at a destination location(s) are disclosed. The data storage system maintains a data log that may be activated when a destination volume is inaccessible. During the logging process the system implements an adaptive memory allocation algorithm that adjusts the log memory allocation increment as a function of the velocity of logging data written by the host computer(s). Similarly, during a merge process the system implements an adaptive memory deallocation algorithm that deallocates log memory in response to the velocity of logging data written by the host computer(s) and the velocity of merge data transmitted to the remote system. An amount of memory allocated to logging data may be compared with an amount of memory allocated to corresponding user data and, if greater, the data log terminated.

US Patent:

6947981, Sep 20, 2005

Filed:

Mar 26, 2002

Appl. No.:

10/106908

Inventors:

Clark Lubbers - Colorado Springs CO, US
Susan Elkington - Colorado Springs CO, US
Randy Hess - Colorado Springs CO, US
Stephen J. Sicola - Palmer Lake CO, US
James McCarty - Colorado Springs CO, US
Anuja Korgaonkar - Colorado Springs CO, US
Jason Leveille - Colorado Springs CO, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

G06F012/00

US Classification:

709223, 714 6, 711162, 711114, 711 6, 707204

Abstract:

A data replication management (DRM) architecture comprising a plurality of storage cells interconnected by a fabric. Flexibility in connectivity is provided by configuring each storage cell port to the fabric to handle both host data access requests and DRM traffic. Each storage cell comprises one or more storage controllers that can be connected to the fabric in any combination. Processes executing in the storage controller find a path to a desired destination storage cell. The discovery algorithm implements a link service that exchanges information related to DRM between the storage controllers. The DRM architecture is symmetric and peer cooperative such that each controller and storage cell can function as a source and a destination of replicated data. The DRM architecture supports parallel and serial “fan-out” to multiple destinations, whereby the multiple storage cells may implement data replicas.

US Patent:

6996672, Feb 7, 2006

Filed:

Mar 26, 2002

Appl. No.:

10/106865

Inventors:

Clark Lubbers - Colorado Springs CO, US
Susan Elkington - Colorado Springs CO, US
Randy Hess - Colorado Springs CO, US
Stephen J. Sicola - Palmer Lake CO, US
James McCarty - Colorado Springs CO, US
Anuja Korgaonkar - Colorado Springs CO, US
Jason Leveille - Colorado Springs CO, US

Assignee:

Hewlett-Packard Development, L.P. - Houston TX

International Classification:

G06F 12/00
G06F 12/14
G06F 12/16
G06F 13/00
G06F 13/28

US Classification:

711114, 709208, 709210

Abstract:

A system and method for replicating data between a plurality of storage locations. Each storage location has a controller with a port to a data communication network and a pool of storage. A logical unit (LUN) of storage is implemented at each storage location such that each implemented LUN comprises a substantially complete replica of the data stored in each other LUN. At least two of the controllers at the plurality of storage locations present their implemented LUN as an active device to the one or more host systems for receiving operational data access requests. Preferably, there are three or more storage locations in the system. Preferably, there are three or more storage locations in the system and each storage location can behave as a source location or a destination location for a particular operational data transaction.

US Patent:

7007042, Feb 28, 2006

Filed:

Mar 28, 2002

Appl. No.:

10/112085

Inventors:

Clark Lubbers - Colorado Springs CO, US
Susan Elkington - Colorado Springs CO, US
Randy Hess - Colorado Springs CO, US
Stephen J. Sicola - Palmer Lake CO, US
James McCarty - Colorado Springs CO, US
Anuja Korgaonkar - Colorado Springs CO, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

G06F 12/00

US Classification:

707202

Abstract:

A data storage system adapted to maintain redundant data storage sets at a destination location(s) is disclosed. The data storage system establishes a copy set comprising a source volume and a destination volume. Data written to a source volume is automatically copied to the destination volume. The data storage system maintains a data log that may be activated when the destination volume is inaccessible due to, for example, a malfunction in the destination storage system or in the communication link between the source system and the destination system. I/O commands and the data associated with those commands are written to the data log, and after a destination system becomes available the information in the data log is merged into the destination volume to conform the data in the destination volume to the data in the source volume. The data log competes for disk capacity with other volumes on the system, and log memory is allocated as needed. In operation, the array controllers monitor connection status between array controllers in a DRM group.

US Patent:

7032131, Apr 18, 2006

Filed:

Mar 26, 2002

Appl. No.:

10/106909

Inventors:

Clark Lubbers - Colorado Springs CO, US
Susan Elkington - Colorado Springs CO, US
Randy Hess - Colorado Springs CO, US
Stephen J. Sicola - Palmer Lake CO, US
James McCarty - Colorado Springs CO, US
Anuja Korgaonkar - Colorado Springs CO, US
Jason Leveille - Colorado Springs CO, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

G06F 11/00

US Classification:

714 16, 714 13, 714 18, 714 20, 709231, 709233

Abstract:

Methods and systems for managing disk capacity allocated to a data log in a source data storage system during a merge process are disclosed. Data in the data log may be merged into corresponding data on a destination storage system connected to the source data storage system by at least one communication link. In one embodiment a method comprises maintaining a ratio of merge writes out of the data log to writes from a host computer into the data log within a desired range until the write process reaches a predetermined distance from the end of the data log, and quiescing writes from a host computer into the data log until the data log is fully written to the destination storage system.

US Patent:

7137032, Nov 14, 2006

Filed:

Jun 27, 2005

Appl. No.:

11/167688

Inventors:

Clark Lubbers - Colorado Springs CO, US
Susan Elkington - Colorado Springs CO, US
Randy Hess - Colorado Springs CO, US
Stephen J. Sicola - Palmer Lake CO, US
James McCarty - Colorado Springs CO, US
Anuja Korgaonkar - Colorado Springs CO, US
Jason Leveille - Colorado Springs CO, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

G06F 11/00
G06F 11/16

US Classification:

714 16, 714 13, 714 18, 714 20, 709231, 709233

Abstract:

Methods and systems for managing disk capacity allocated to a data log in a source data storage system during a merge process are disclosed. Data in the data log may be merged into corresponding data on a destination storage system connected to the source data storage system by at least one communication link. In one embodiment a method comprises maintaining a ratio of merge writes out of the data log to writes from a host computer into the data log within a desired range until the write process reaches a predetermined distance from the end of the data log, and quiescing writes from a host computer into the data log until the data log is fully written to the destination storage system.