HP B6960-96035, Руководство по концепциям

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High performance hardware other than devices
Performance of computer systems
The speed of computer systems themselves directly impacts performance. The systems
are loaded during backups by reading the disks, handling software compression,
and so on.
The disk read data rate and CPU usage are important performance criteria for the
systems themselves, in addition to I/O performance and network types.
Advanced high performance configuration
Data Protector Zero Downtime Backup solution provides a means of shortening the
application downtime or backup mode time and reduces the network overhead by
using locally attached backup devices instead of network backup devices. The
application downtime or backup mode time is limited to the time needed to create
a replica of data, which is then backed up on a backup system to a locally attached
device.
For more information on Zero Downtime Backup, see the HP Data Protector zero
downtime backup concepts guide.
Using hardware in parallel
Using several datapaths in parallel is a fundamental and efficient method to improve
performance. This includes the network infrastructure. Parallelism boosts performance
in the following situations:
When to use parallelism
• Several client systems can be backed up locally, that is, with the disk(s) and the
related devices connected on the same client system.
• Several client systems can be backed up over the network. Here the network
traffic routing needs to be such that datapaths do not overlap, otherwise the
performance is reduced.
• Several objects (disks) can be backed up to one or several (tape) devices.
• An object (disk or files) can be directly backed up to several (tape) devices using
several XCOPY engines.
• Several dedicated network links between certain client systems can be used. For
example, if system_A has 6 objects (disks) to be backed up, and system_B has
Concepts guide 69