PowerProtect Data Manager 19.15 Microsoft SQL Server User Guide

Configuring usage limits of DD streams

A storage unit can have soft and hard limits for streams. The DD administrator can set individual soft limits for read, write, and replication streams. The administrator can set a hard limit only for the total number of streams.

1. Determine which application agent hosts use the storage unit.
2. Determine the number of backup streams to allow for the storage unit.
3. Create the storage unit.
   The DD administrator can set the streams limit either as part of the ddboost storage-unit create command or after creating the storage unit by using the ddboost storage-unit modify command. The DD documentation provides information.
   NOTE:The DD administrator cannot set a streams limit by using the DD Administration GUI.
4. Provide the DD hostname, storage unit name, username, and password of the storage unit to the application agent users to use to perform backups.

   The DD administrator can also set soft limits for the storage unit, which send alerts and notifications, but do not limit the number of streams used.

   The DD administrator can use the ddboost storage-unit modify command to modify the streams limits of storage units. The DD documentation provides information.

   CAUTION:The DD administrator must use caution when setting a streams hard limit. Setting the streams limit to a low value can impact the backup and restore performance. Decreasing a streams limit can result in a restore failure. The DD administrator must notify the application agent users when decreasing a streams hard limit so that the application agent users can evaluate the potential impact on backups and restores.