Robert P Eskenberry

US Patent:

6728736, Apr 27, 2004

Filed:

Mar 14, 2001

Appl. No.:

09/805503

Inventors:

David G. Hostetter - Superior CO
Michael S. Milillo - Louisville CO
Chrisopher J. West - Boulder CO
Robert P. Eskenberry - Broomfield CO

Assignee:

Storage Technology Corporation - Louisville CO

International Classification:

G06F 1730

US Classification:

707204, 707202, 707205

Abstract:

A system and method for synchronizing a data copy that include a source volume having a data file stored thereon, the source volume for receiving write commands from a host, executing the write commands to generate an updated data file, and generating a record of the write commands. The system and method further include a secondary volume having a copy of the data file stored thereon, the secondary volume for receiving and storing data indicated by the write command record, wherein the copy of the data file and the data indicated by the write command record are available for use in generating a copy of the updated data file.

US Patent:

7177980, Feb 13, 2007

Filed:

Dec 18, 2001

Appl. No.:

10/023321

Inventors:

Michael S. Milillo - Louisville CO, US
David G. Hostetter - Superior CO, US
Christopher J. West - Boulder CO, US
Robert P. Eskenberry - Broomfield CO, US

Assignee:

Storage Technology Corporation - Louisville CO

International Classification:

G06F 12/00
G06F 9/26

US Classification:

711113, 711210

Abstract:

A cache storage system and method are provided for saving storage space in a cache, the system and method for use in a data storage system having multiple storage devices and multiple virtual addresses, each virtual address having a data object associated therewith. Each data object is stored at a storage device location having a unique identifier. The cache storage system and method include a cache for storing a data object associated with at least one virtual address. For a first virtual address, the first virtual address data object is staged into the cache. For a second virtual address, a pointer is generated for use in pointing to the first virtual address data object staged in the cache when the storage device location identifier of the second virtual address data object matches the storage device location identifier of the first virtual address data object.

US Patent:

20020133512, Sep 19, 2002

Filed:

Aug 27, 2001

Appl. No.:

09/939150

Inventors:

Michael Milillo - Louisville CO, US
Christopher West - Boulder CO, US
David Hostetter - Superior CO, US
Robert Eskenberry - Broomfield CO, US
Jennifer Johnson - Boulder CO, US

Assignee:

Storage Technololgy Corporation - Louisville CO

International Classification:

G06F012/00

US Classification:

707/204000

Abstract:

A system and method for synchronizing a data copy include in one embodiment first and second remote copy trios, each with source, target, and secondary volumes. Source volumes store initial data files, execute write commands to generate updated data files, and generate records of the write commands. Target volumes receive copies of the initial data files and the write command records, and transmit the copies of the initial data files and data indicated by the write command records to secondary volumes. Secondary volumes store the copies of the initial data files and the data indicated by the write command records, which are available for use in generating copies of the updated data files. The target volumes transmit to the secondary volumes in series relative to each other so that consistency is maintained at all times across the source volumes.