NetBackup™ NAS Administrator's Guide
- Section I. About NAS backups
- Section II. Using NAS-Data-Protection (D-NAS)
- D-NAS overview
- D-NAS Planning and Tuning
- Pre-requisites for D-NAS configuration
- Volume multi-host backup
- Configure D-NAS policy for NAS volumes
- Using accelerator
- Using Vendor Change Tracking
- Replication using D-NAS policy
- Restoring from D-NAS backups
- Troubleshooting
- Section III. Using NDMP
- Introduction to NetBackup for NDMP
- About NetBackup for NDMP
- Types of NDMP backup
- About assigning tape drives to different hosts
- Installation Notes for NetBackup for NDMP
- Configuring NDMP backup to NDMP-attached devices
- About Media and Device Management configuration
- About creating an NDMP policy
- About enabling or disabling DAR
- Configuring NDMP backup to NetBackup media servers (remote NDMP)
- Configuring NDMP DirectCopy
- Accelerator for NDMP
- Remote NDMP and disk devices
- Using the Shared Storage Option (SSO) with NetBackup for NDMP
- NAS appliance information for NDMP
- Vendor-specific information
- EMC Celerra
- NetApp
- Using NetBackup with NetApp's Data ONTAP 8.2 cluster mode
- Using NetBackup with NetApp's Data ONTAP 8.2 cluster mode
- Backup and restore procedures
- Troubleshooting
- Using NetBackup for NDMP scripts
- Introduction to NetBackup for NDMP
About Direct Access Recovery (DAR)
NetBackup uses Direct Access Recovery (DAR) to restore a directory or individual files from a backup image. DAR can greatly reduce the time it takes to restore files and directories. DAR is enabled by default. No configuration is required.
DAR enables the NDMP host to position the tape to the exact location of the requested files. It reads only the data that is needed for those files. For individual file restore, NetBackup automatically determines whether DAR shortens the duration of the restore. It activates DAR only when it results in a faster restore.
The following prerequisites are necessary for using DAR with NetBackup for NDMP:
The NDMP host must support DAR where the NDMP server application resides.
NetBackup 4.5 GA or later, with the catalog in binary format (binary format is the default).
Further details are available as to when DAR is used and how to disable it.
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