Veritas NetBackup™ Administrator's Guide, Volume II
- NetBackup licensing models and the nbdeployutil utility
- Creating and viewing the licensing report
- Reviewing a capacity licensing report
- Reconciling the capacity licensing report results
- Reviewing a traditional licensing report
- Additional configuration
- About dynamic host name and IP addressing
- About busy file processing on UNIX clients
- About the Shared Storage Option
- About configuring the Shared Storage Option in NetBackup
- Viewing SSO summary reports
- About the vm.conf configuration file
- Holds Management
- Menu user interfaces on UNIX
- About the tpconfig device configuration utility
- About the NetBackup Disk Configuration Utility
- Reference topics
- Host name rules
- About reading backup images with nbtar or tar32.exe
- Factors that affect backup time
- NetBackup notify scripts
- Media and device management best practices
- About TapeAlert
- About tape drive cleaning
- How NetBackup reserves drives
- About SCSI persistent reserve
- About the SPC-2 SCSI reserve process
- About checking for data loss
- About checking for tape and driver configuration errors
- How NetBackup selects media
- About selecting media in robots
- About selecting media in standalone drives
- About Tape I/O commands on UNIX
Table: Transfer rate factors
Speed of the backup device
Backups that are sent to tapes with a transfer rate of 800 kilobytes per second are generally faster than tapes with a transfer rate of 400 kilobytes. (Assume that other factors allow for the faster transfer rate.)
Available network bandwidth
The available bandwidth is less than the theoretical network bandwidth and depends on how much other network traffic is present. For example, multiple backups occurring on the same network compete for bandwidth.
Speed with which the client can process the data
The speed varies with the hardware platform and depends on the other applications that run on the platform. File size is also an important factor. Clients can process larger files faster than smaller ones. A backup for 20 files, 1 megabyte each, is faster than a backup for 20,000 files that are 1 kilobyte each.
Speed with which the server can process the data
Like client speed, server speed also varies with the hardware platform and depends on the other applications that run on the platform. The number of concurrent backups being performed also affects server speed.
Network configuration can affect performance
For example, when some computers run full-duplex and some run half-duplex in an Ethernet environment, the throughput is significantly reduced.
Compression (on UNIX)
Software compression often multiplies the backup time by a factor of two or three for a given set of data.
These delays can vary widely and depend on the devices and the computing environments.