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When you back up data from the machine that is the Power Edition server or
storage node, this automatic feature speeds up data transfer. CPU load is reduced
because data is transferred within memory. Power Edition enables local backup
and recover to bypass the CPU overhead of networking protocols.
Storage nodes
A Power Edition server can have several storage nodes attached, each with
multiple devices, enabling the transmission of up to a maximum of 512 parallel
backup sessions with a maximum of 256 devices. Because Power Edition storage
nodes store data locally and maintain all of the metadata associated with the
controlling Power Edition server, backup speed and efficiency is enhanced. You
can use immediate save and immediate recover to back up and recover data
hosted on a storage node.
High speed device support
Power Edition supports a broad range of autochangers and silo tape library
models. Autochangers and silos can contain multiple storage devices (tape drives
or optical drives). They also can automate the tasks of loading, unloading, and
labeling storage media, so backups can proceed without your intervention. High
speed devices are configured for higher throughput, so they can write data to
media faster, in larger blocks.
File device type and save set staging
Support for the file device type enables backup to disk, and save set staging
enables automated transfer of data from one medium to another accor ding to
user-defined policies.
RPC (remote procedure call) enhancements
Power Edition includes improvements to RPC, the communications between
processes, to improve the efficiency of both local and remote backup and recover
operations.
Power Edition reduces the time it takes to back up data in the local backup case,
because the data and the Power Edition server are hosted on the same machine.
Data does not have to travel through a protocol, such as TCP/IP, before it is
directed to a storage device. Instead, data is transferred within memory on the
server machine. Thus, network throughput is eliminated as a potential bottleneck.
The same is true for recover operations.
When you back up data from remote clients, the data travels over the network
through a protocol, such as TCP/IP. Enhancements to RPC and high speed
devices improve the performance of both remote and local backups.
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