Adam Michael Phelps

US Patent:

7155635, Dec 26, 2006

Filed:

Feb 6, 2004

Appl. No.:

10/773699

Inventors:

Adam M. Phelps - San Francisco CA, US

Assignee:

3PARdata, Inc. - Fremont CA

International Classification:

G06F 12/16

US Classification:

714 6, 714 34, 714 18, 711162

Abstract:

A method for resynchronizing a primary volume in a primary system and a secondary volume in a secondary system over a network includes, when a network connection between the primary system and the secondary system is interrupted, creating a snapshot of the primary volume and determining data updates transmitted from the primary system to the secondary system that were not acknowledged by the secondary system. The method further comprises, when the network connection is reestablished, determining differences between the snapshot and the primary volume, transmitting the differences and the unacknowledged data updates from the primary system to the secondary system, and updating the secondary volume with the differences and the unacknowledged data, wherein the secondary volume becomes an updated copy of the primary volume.

US Patent:

20120079222, Mar 29, 2012

Filed:

Sep 29, 2010

Appl. No.:

12/893335

Inventors:

Adam M. Phelps - San Francisco CA, US
Richard T. Dalzell - Belfast, GB
Hariprasad Mankude Bhasker Rao - San Ramon CA, US

Assignee:

3PAR, INC. - Fremont CA

International Classification:

G06F 12/16
G06F 12/00

US Classification:

711162, 711E12001, 711E12103

Abstract:

A host write based write ordering mechanism is used so the write ordering on the secondary system is derived from the write ordering applied by the host to the primary system. In this scheme any set of writes that was issued in parallel on the primary system may also be issued in parallel on the secondary system. The parallel writes provide better performance compared to absolute or strict write ordering allowing only one outstanding write per volume group.

US Patent:

7100089, Aug 29, 2006

Filed:

Sep 6, 2002

Appl. No.:

10/237432

Inventors:

Adam M. Phelps - Menlo Park CA, US

Assignee:

3PARdata, Inc. - Fremont CA

International Classification:

G06F 11/00

US Classification:

714 42, 711162

Abstract:

A method is provided for synchronization of a backup copy of a volume of memory represented by a snapshot tree. The snapshot tree includes a plurality of snapshot volumes, each snapshot volume corresponding to a respective snapshot of the volume of memory. The method comprises the following: determining whether there are any exceptions in any of the snapshot volumes in the snapshot tree between and including the snapshot volumes corresponding to a first and a second snapshot; if there are exceptions, processing for the exceptions to synchronize the backup copy of the memory volume; otherwise, if there are no exceptions, ignoring the snapshot volumes.