Emc IP Holding Company LLC

Emc Corporation

Anestis Panidis

Assaf Natanzon

Saar Cohen

Arieh Don

Patrick Brian Riordan

Jeffrey A Lewis

Helen S Raizen

Ian Wigmore

Michael E Bappe

Subin George

Kadir Ozdemir

Prakash Venkatanarayanan

David Meiri

Mark J Halstead

Alexandr Veprinsky

Michael J Scharland

Kirill Shoikhet

Michael E Specht

Ofer Michael

Xiali He

Slavik Neymer

Ido Halevi

Ramprasad Shetty

Sergey Kornfeld

Pei-Ching Hwang

Brian Riordan

Ilya Garelik

Arich Don

Andrew Ralich

Example embodiments of the present invention relate to a method, a system, and a computer program product for performing data replication and backup. The method comprises performing a first data replication of a production site storage to a replication site storage and performing a first backup of the production site storage to a production site backup storage. A second data replication then may be performed from the production site backup storage to a backup site backup storage.

Method and system for star replication using multiple replication technologies

In one aspect, a method includes sending a first snapshot of a volume at a production site to a backup device at a replication site, sending a second snapshot of the volume to the backup device and sending metadata of differences between the first and second snapshots to the backup device.

Storing snapshot changes with snapshots

In one aspect, a method includes reading metadata for a logical unit (LU) to restore, restoring active read areas to the LU identified in the metadata and exposing the LU to a host after restoring the active read areas of the LU. In another aspect, an apparatus includes electronic hardware circuitry configured to reading metadata for a LU to restore, restoring active read areas to the LU identified in the metadata and exposing the LU to a host after restoring the active read areas of the LU. In a further aspect, an article includes a non-transitory computer-readable medium that stores computer-executable instructions. The instructions cause a machine to read metadata for a LU to restore, restore active read areas to the LU identified in the metadata and expose the LU to a host after restoring the active read areas of the LU.

Restoring active areas of a logical unit

Method and system for point-in-time recovery from a deduplicated data system is discussed. A request specifying a point-in-time may be received. A backup snapshot nearest that point-in-time may be identified, and a recovery snapshot may be synthesized.

Point-in-time recovery on deduplicated storage

The system, process, and methods herein describe a mechanism for aligning IOs with block sizes. The alignment may occur on a storage system as part of a continuous replication process. The TO offset may be rounded down, and the size may be rounded up, so that each is a multiple of the block size.

Alignment fixing on a storage system during continuous data replication to deduplicated storage

A method and system for maintaining backups on deduplicated storage using continuous data replication is discussed. A backup snapshot may be initialized. Application IO's may thereafter be transmitted to the deduplicated storage and placed in a journal. A second backup snapshot may be synthesized using the initial backup snapshot and/or the application IO's.

Maintaining backup snapshots on deduplicated storage using continuous replication

A computer-implemented method is disclosed to enhance command burst tolerance in a SCSI system. The method starts with receiving an initiator timeout value at a SCSI target, where the SCSI target is communicatively coupled with a SCSI initiator through a set of communication links, and where the initiator timeout value is associated with a timeout duration after which the SCSI initiator times out if receiving no response from the SCSI target after sending a SCSI command. After receiving the initiator timeout value, the SCSI target determines how long a SCSI command has been pending to be processed at the SCSI target. The SCSI target then returns a response for the SCSI command to the SCSI initiator within the timeout duration associated with the initiator timeout value even if the SCSI command is pending to be processed at the SCSI target.

Method and apparatus for enhancing command burst tolerance

The system, process, and methods herein describe a mechanism for creating an initial backup snapshot on deduplicated storage. Initialization IO's may be transmitted to the deduplicated storage, and those initialization IO's may be synthesized into a snapshot. Application IO's may also be transmitted in case the source side data changes while the backup is synthesized.

Initializing backup snapshots on deduplicated storage

A method and system for recovering a corrupt storage system is discussed. A request to recover the system may be received. A backup snapshot for the last point-in-time the system was stable may be synthesized. A difference may be identified between that backup snapshot and the current system. The difference may be transmitted to the corrupt system to recover the data.

Recovering corrupt storage systems

A method and system for maintaining granular backups is discussed. Backup windows may be defined, and policies may be associated with those windows. Journal and backup files may be retained or deleted in accordance with those policies.

Maintaining point-in-time granularity for backup snapshots

A system, computer program product, and computer-executable method for providing access to data on a primary data storage including a production Logical Unit (LU) in communication with a backup storage and a Data Protection Appliance (DPA), the system, computer program product, and computer-executable method comprising creating a snapshot of the production LU on the primary data storage, synthesizing a recovery snapshot at a Point in Time (PiT), wherein the recovery snapshot is the production LU at the PiT, and performing a restore operation on the snapshot of the production LU at the primary data storage using the recovery snapshot, wherein the snapshot of the production LU is restored to the production LU at the PiT, thereby creating a second recovery snapshot.

Production recovery using a point in time snapshot

The system, process, and methods herein describe a mechanism for aligning IOs with block sizes. The alignment may occur on a data protection appliance as part of a continuous replication process. The IO offset may be rounded down, and the size may be rounded up, so that each is a multiple of the block size.

Alignment fixing on a data protection system during continuous data replication to deduplicated storage

A method and system for synthesizing backup snapshots is discussed. IO's may be streamed from multiple locations, and placed in journal files. These journal files may thereafter be used to synthesize the backup snapshot.

Maintaining backup snapshots using continuous replication from multiple sources

A computer-implemented method is disclosed to enhance link anomaly tolerance in a small computer system interface (SCSI) system. The method starts with detecting a SCSI command failed at a SCSI target, where the SCSI target is communicatively coupled with a SCSI initiator through a set of communication links and the failed SCSI command is sent from the SCSI initiator. After detecting the failure, the SCSI target withholds returning a response for the failure. Then the SCSI target checks a status of the set of communication links periodically within the withholding duration while the response for the failed SCSI command is withheld. The SCSI target returns the response for the failed SCSI command upon at least one of two conditions is met: (1) The withhold duration expires; (2) The set of communication links is determined to function normally based on checking the status of the set of communication links.

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Saratoga, CA, United States of America

Anestis Panidis