Managing Backup Policies (Classes)
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• The number of backups that can run concurrently is determined by the
number of available storage units and the maximum jobs parameters (see
tuning “Tuning Allow Multiple Data Streams” on page 72).
When to Use Allow Multiple Data Streams
Reduce Backup Time
Allow Multiple Data Streams can reduce the backup time for very large
backups. This is achieved by splitting the backup into multiple streams and
then using multiplexing, multiple drives, or a combination of the two for
processing the streams concurrently.
In addition, configuring the backup so each physical device on the client is
backed up by a separate data stream that runs concurrently with streams from
other devices can significantly reduce backup times.
Note:
For best performance, use only one data stream to back up each
physical device on the client. Multiple concurrent streams from a single
physical device can adversely affect backup times.
Drive A
Drive B
stream
stream
stream
stream
Client
Drive A
Drive B
stream
stream
NetBackup
Client
Recommended for Best Performance
Back up each device with a
separate stream that runs
concurrently with streams
from other devices. Then,
Not Recommended
multiplex the streams or
send them to separate tapes.
Using multiple concurrent
streams from a single device
can adversely affect backup
times.
Server
NetBackup
Server
NetBackup 3.2 System Administrator's Guide for Windows NT
NetBackup 3.2 System Administrator's Guide for Windows NT
