Dynamic streaming parameter
Dynamic streaming is a group of backup streams running in parallel that dynamically distributes the files for backups among them. This feature optimizes and speeds up the backup of dense NAS volumes or shares.
Maximum number of streams per volume: The value determines the number of backup streams that are deployed for backing up each volume. For example, if a policy contains 10 volumes, and the value of this parameter is set to 4, then you see a group of four backup streams for each volume. So, a total of 40 child backup streams and 10 parent backup streams run during the backup.
You can set this parameter in the web UI. The default maximum value is 40. You can select a value between 1 to 40.
You can configure the maximum value this parameter to be available in the web UI, using the MAX_NUMBER_OF_DYNAMIC_STREAMS parameter in the bp.conf file. You can specify any numeric value greater than 0.
For example, if you assign the value 100 to this parameter in the bp.conf file, you can set values from 1 to 100 streams per volume in a D-NAS policy in the web UI.
Note the following about the dynamic streaming parameter:
Setting the dynamic streaming parameter to a default value of 10 or lower, NetBackup forces the D-NAS policy to use only a single host. NetBackup does not consider multiple hosts, even if they are present in the backup host pool.
For optimum utilization of resources, set the dynamic streaming parameter to more than 10, when combined with the multi-host feature. This way, the streams are distributed across multiple hosts, thus reducing the load on only one host.