HP B6960-90078 Performance Considerations, A-8, Network, Devices, Datastream, Appendix A, Local Datastream, The Infrastructure, Performance Considerations

Further Information

Performance Considerations

	Performance Considerations
	This section gives an overview of the most common backup performance
	factors. It is not meant to discuss performance. Due to the high number
	of variables and permutations, it is not possible to give distinct
	recommendations that fit all user requirements and affordable
	investment levels. Further discussions can be found in the HP OpenView
	Storage Data Protector Concepts Guide.
	The Infrastructure
	The infrastructure has a high impact on backup and restore
	performance. The most important factors are the parallelism of data
	paths and the use of high speed equipment.
	Network Versus Local Backups and Restores
	Sending data over the network introduces additional overhead, as the
	network becomes a component to performance consideration. Data
	Protector handles the datastream differently for the following cases:
Network	Disk to Memory to Network to Memory to Device
Datastream
Local Datastream	Disk to Memory to Device
	In order to maximize the performance, it is recommended to use local
	backup configurations for high volume datastreams.
	Devices
	The device type and model impacts the performance because of the
	sustained speed at which a device can write data to a tape (or read data
	from it). For example:
	• DDS/DAT devices typically have a sustained speed of 510 KB/s to
	3 MB/s, without compression, depending on the model.
	• DLT devices typically have a sustained speed of 1.5 MB/s to 6 MB/s,
	without compression, depending on the model.
	• LTO devices typically have a sustained speed of 10 MB/s to 20MB/s,
	without compression, depending on the model.

A-8 Appendix A