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  1. Home
  3. NetBackup™ Web UI Microsoft SQL Server Administrator's Guide
  5. Protecting Microsoft SQL Server
  7. Edit protection settings for a asset
  9. Snapshot methods

Snapshot methods

The following snapshot methods and options are available for snapshot backups. For more details see the NetBackup Snapshot Client Administrator's Guide.

Table:

Method

Description

Automatic

NetBackup selects a snapshot method when the backup starts. If necessary, NetBackup selects a different method for assets in the protection plan.

VSS

VSS uses the Volume Shadow Copy Service of Windows. VSS is for local backup and it selects the actual snapshot method depending on which snapshot provider is configured on the client.

Provider type:

  • Automatic. NetBackup selects the available provider in this order: Hardware, Software, System.

  • System. Use the Microsoft system provider for a block-level copy on write snapshot.

  • Use the software provider to intercept the I/O requests at the software level between the file system and the volume manager.

  • Use the hardware provider for your disk array.

Snapshot attribute:

  • Automatic. NetBackup selects the attribute.

  • Differential. Use a copy-on-write type of snapshot.

  • Plex. Use a clone or a mirror type of snapshot.

VxVM

For any snapshots with any data that is configured over Volume Manager volumes.

  • Resynchronize mirror in background. Select this option to allow more efficient use of backup resources. If two backups need the same tape drive, the second can start even though the resynchronize operation for the first job has not completed.

  • Wait for mirror sync completion. Select this option if full-sized instant snapshots are not available for backup until the mirror synchronization is complete. If the backup starts before the snapshot disks are fully synchronized with the source and the server does not have access to the source disks, then the backup fails.

  • Maximum number of volumes to resynchronize. The number of volume pairs that are resynchronized simultaneously. Accept the default if the I/O bandwidth in your clients and disk storage cannot support simultaneous synchronization of volumes. For the configurations that have sufficient I/O bandwidth, multiple volumes can be resynchronized simultaneously, to complete resynchronization sooner. A major factor in I/O bandwidth is the number and speed of HBAs on each client.

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