Snapshot methods
The following snapshot methods and options are available for snapshot backups. For more details see the NetBackup Snapshot Client Administrator's Guide.
Although all of these features are provided through Snapshot Client support for SQL Server, not all snapshot methods are supported. For a description of snapshot methods available for use with NetBackup for SQL Server, see the NetBackup Snapshot Client compatibility list.
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. This option is not supported for MS-SQL-Server policies. 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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