Veritas NetBackup™ for NDMP Administrator's Guide
- 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
- Backup selection options for an NDMP policy
- About enabling or disabling DAR
- Configuring NDMP backup to NetBackup media servers (remote NDMP)
- Configuring NDMP DirectCopy
- About NDMP DirectCopy
- Using NDMP DirectCopy to duplicate a backup image
- Accelerator for NDMP
- Remote NDMP and disk devices
- Using the Shared Storage Option (SSO)
- Backup and restore procedures
- About NetBackup for NDMP logs
- NetBackup for NDMP troubleshooting suggestions
- About robot tests
- Using NetBackup for NDMP scripts
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.