Computer Associates BABNWUP900NE6 Administration Guide - Page 89

Multiplexing Submitting a Multiplexing Job To submit a multiplexing job, you must enable the Multiplexing feature on the Destination tab in the Backup Manager. In addition, you can select any of the following: ■ Multiplexing media (multiplexing media appear with a blue circle with an M next to them) ■ Blank media ■ Media pool Note: You cannot submit a multiplexing job to a tape library that has WORM media unless you use the Virtual Library option to split the tape library into groups so that one has WORM media and the other does not. If you do this, you can submit a multiplexing job to the group that does not have WORM media. For more information about the Virtual Library option, see Configuring a Virtual Library in the chapter "Configuring Devices." Multiplexing Global Options BrightStor ARCserve Backup offers the following multiplexing global options: ■ Chunk Size-Sets the performance of restore operations and memory usage. The chunk size value determines the amount of contiguous data written for one session before data from another session is multiplexed. The higher the value, the faster the restore on some drives, but at the cost of memory size during backup. For most drives, the default value of 1 MB is recommended. ■ Maximum Number of Streams-Sets the maximum number of streams that can write to a tape at the same time. The default number of streams is 4 and the supported range is between 2 and 4. If you have the Enterprise Module installed, the supported range is between 2 and 32. Backing Up Data 3-27