Transfer rate — NetBackup 10.3 | Cohesity Documentation

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Transfer rate — NetBackup 10.3 | Cohesity Documentation

NetBackup™ Administrator's Guide, Volume II

Transfer rate

The transfer rate depends on the following factors.

Table: Transfer rate factors

Factor	Description
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.
Device delays	Device delays can be due to the following factors: The device may be busy or slow to load the media. The device may be slow to find the location on the media at which to start writing the backup. These delays can vary widely and depend on the devices and the computing environments.

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