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Veeam Backup & Replication 9.5 Update 4
User Guide for Microsoft Hyper-V

Tape Parallel Processing

You can use multiple drives simultaneously for writing data to tape. This option is useful if you have a lot of tape jobs running at the same time or you have a lot of data that must be written to tape in a limited backup window. You can configure multiple drives in the following ways:

  • Use multiple drives of one tape library
  • Manage multiple tape libraries and use several or all drives across all managed libraries.

Parallel processing is enabled in media pool settings. To use drives of multiple libraries, you must enable the parallel processing mode for the libraries that are managed by the media pool.

To process the tape data parallelly, you can split the data across drives in 2 ways:

Processing Tape Jobs Simultaneously

When you process tape jobs parallelly, the media pool assigns a drive to each running tape job. For example, if you set 3 drives as the maximum, you can process up to 3 tape jobs at the same time. If you have more jobs running at the same time, they are queued. When one of the jobs finishes and releases its drive, the first queued job takes the drive.

This option is available for backup to tape and file to tape jobs.

For example:

The tape jobs start, and jobs A, B and C occupy 3 drives to write data to tape. The Tape job D is queued and waits. When one of the jobs finishes and releases its drive, the Tape job D takes the drive and starts writing data.

Tape Parallel Processing 

Processing Backup Chains Simultaneously

When you select processing backup chains parallelly, the media pool processes several source jobs simultaneously. If the source jobs produce per-VM backups or is an agent job, the media pool processes several per-VM backup chains simultaneously. For more information about per-VM backup files, see Per-VM Backup Files

This option is available for backup to tape jobs only.

For example:

  • You set the maximum number of drives to 3
  • Tape job A has 4 source jobs.

Tape job A starts and occupies 3 drives to process 3 source jobs. The fourth source job is queued and waits. When one of the drives is released, the fourth source job takes the drive and starts writing data.

If another tape job starts, it will be queued and wait until Tape job A finishes.

Tape Parallel Processing 

If a tape job has only 1 source job, it is processed as 1 source.

For example:

  • You set the maximum number of drives to 3
  • Tape job A has 1 source job; Tape job B has 3 source jobs. Both tape jobs start at the same time.

Tape job A occupies Drive 1. Tape job B occupies 2 other available drives and processes 2 source jobs. Tape job A finishes and releases Drive 1, the third source job from the Tape job B occupies Drive 1.

Tape Parallel Processing 

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