Additional Setup
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Multiplexing
NetBackup multiplexing sends concurrent backups from one or several clients
to a single storage device (see figure below). NetBackup multiplexes the
backups sequentially onto the media. Multiplexed and unmultiplexed backups
can reside on the same volume. It is not necessary to create separate volume
pools or media IDs.
No special action is required to restore a multiplexed backup. NetBackup finds
the media and restores the requested backup.
When to Use Multiplexing
Multiplexing is generally used to reduce the amount of time required to
complete backups. The following are situations where multiplexing can
improve backup performance.
• Slow clients. This includes instances where NetBackup is using software
compression, which normally reduces client performance.
• Multiple slow networks. The parallel data streams take advantage of
whatever network capacity is available
• Many short backups (for example, incrementals). In addition to providing
parallel data streams, multiplexing reduces the time each job spends
waiting for a device to become available, and therefore better utilizes the
transfer rate of storage devices.
Clients
Server
Removable Media
Disk
Disk
Disk
or Magnetic Disk
NetBackup 3.2 System Administrator's Guide for Windows NT
NetBackup 3.2 System Administrator's Guide for Windows NT
