Multistreaming is a process that lets you divide backup jobs into multiple subjobs (streams) that run simultaneously, and send data to the destination media (tape device or file system device). Multistreaming is useful when performing large backup jobs because it is more efficient to divide jobs into smaller streams, which helps decrease the backup window.
By default, Arcserve Backup lets you transmit up to two streams of backup data to disk staging and tape staging devices. To transmit up to 32 streams of backup data, you must install and license the Arcserve Backup Enterprise Module on the Arcserve Backup primary server. With the Enterprise Module, Arcserve Backup lets you submit normal multistreaming backup jobs that can transmit more than one stream of backup data to the destination device, and staging backup jobs that can transmit more than two streams of backup data to the staging device.
Example: How to Leverage Multistreaming to Improve Backup Performance
The following example describes a scenario where you can leverage multistreaming to improve backup performance.
The following screen illustrates the volumes contained in the backup:
Max Number of Streams
With multistreaming backups, the best practice is to specify a Max Number of Streams value that is equal to the number volumes that contain a large amount of data.
Example:
Volume /, volume /usr, and volume /data contain a large amount of data. In this example, the best practice is to specify 3 as the value for the Max Number of Streams.
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