HP B6960-96035 User Manual download pdf (Page 294)

writers, and backup and restore functionality. For detailed information on the

integration, see the HP Data Protector integration guide.

VSS backup

In case of VSS-aware writers’ backup, the consistency of data is provided at writer

level and does not depend on the backup application. Data Protector follows the

requirements provided by the writers when selecting what to back up.

During the backup of VSS-aware writers, Data Protector does not communicate with

each writer individually, but through the VSS interface. It uses the VSS integration

agent to connect the Volume Shadow Copy service, which coordinates the backup

process. VSS provides Data Protector with the writer-related metadata necessary for

performing a consistent backup and restore. Data Protector examines this data and

identifies the volumes to be backed up. Data Protector then requests VSS to create

a shadow copy of the specified volumes.

NOTE:

A Writer Metadata Document (WMD) is metadata provided by each writer. Writers

identify themselves by the metadata and instruct the backup application what to back

up and how to restore the data. Data Protector therefore follows the requirements provided

by the writer when selecting the volumes to be backed up and the restore method.

Volume Shadow Copy service synchronizes the writers and providers. After a backup

shadow copy is created, VSS communicates this information to Data Protector. Data

Protector performs a backup from the shadow copy volume to the media and then

notifies VSS that the shadow copy can be released.

VSS restore

VSS integration restore refers to the restore of data which was backed up using the

Volume Shadow Copy service and a writer. During the restore procedure, Volume

Shadow Copy service coordinates communication between Data Protector and the

writers.

When restoring VSS-aware writers, Data Protector first restores all the relevant

metadata to identify the backup components and to determine the restore method.

It then connects to the Volume Shadow Copy service and declares that the restore is

about to begin. VSS coordinates the writers’ activities during the restore. After Data

Protector has successfully restored the data, VSS informs the writers that the restore

has been completed and the writers can access the restored data and start their

internal processing.

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HP B6960-96035 User Manual Page 294