Computer Associates ARB6002700WF0. ..... Administration Guide - Page 88

Multiplexing When data is backed up over the network from multiple sources, most of the previous factors are involved, which reduces the throughput and increases the amount of time it takes to perform a backup. In addition, if the tape drive is not consistently streamed, the life of the tape drive is reduced drastically because of the SHOE-SHINE effect-when data is written intermittently, the drive has to stop, and then go back and forth on the media to adjust to the new position from where it has to write again. With multiplexing, data is continuously available and tape drives are constantly streaming. This decreases the amount of time it takes to perform a backup while increasing the life of the hardware. Features Supported by Multiplexing The following table includes the features that are supported and not supported with multiplexing: Supported Not Supported Multiple jobs can write to the same tape Multiple restores simultaneously from drive. a single multiplexing tape. Single session restore from multiplexing tapes. Multiple session consolidation simultaneously from a single multiplexing tape to multiple non-multiplexing tapes. QFA restore from multiplexing tapes. The Verify after Backup option. Merge from multiplexing tapes. Disk staging during multiplexing. Disaster recovery Multiplexing jobs cannot be submitted to NAS devices, File System Devices, RAID devices, and WORM media. Session consolidation from a multiplexing tape to a non-multiplexing tape. Multiplexing is not available if you are using the BrightStor ARCserve Backup Enterprise Option for Microsoft SQL Using HDS Snap-Shot, BrightStor ARCserve Backup Image Option, or BrightStor ARCserve Backup Serverless Backup Option. Scan and compare on multiplexing tapes. Multiplexing jobs cannot be submitted to a non-multiplexing media. Multiplexing is not supported on Optical Changers and DVD drives. 3-26 Administrator Guide