This option is available for backup to tape jobs only. To enable this mode, select the Enable parallel processing for tape jobs using this media pool and Enable parallel processing of backup chains within a single job check boxes in optional media pool settings. When you select processing backup chains parallelly, the media pool processes several source jobs simultaneously. When one of the jobs finishes and releases its drive, tape job D takes the drive and starts writing data. The tape jobs start, and jobs A, B and C occupy three drives to write data to tape.

You set the maximum number of drives to three.

This option is available for backup to tape and file to tape jobs. If this mode is enabled in media pool settings, for machine backup to tape jobs you can limit the number of drives the job can use, as described in Specify Archiving Options. To enable this mode, select the Enable parallel processing for tape jobs using this media pool check box in optional media pool settings. When one of the jobs finishes and releases its drive, the first queued job takes the drive. If you have more jobs running at the same time, they are queued. For example, if you set three drives as the maximum, you can process up to three tape jobs at the same time. When you process tape jobs parallelly, the media pool assigns a drive to each running tape job.

The number of drives available is less than the number of drives assigned for this media pool.

The number of tapes available is less than the number of drives assigned for this media pool.

That may happen under one of the following conditions: Tape jobs may simultaneously use less drives than configured in optional media pool settings.

Parallel processing for source chains of one (or more) tape jobs.

To process the tape data parallelly, you can split the data across drives in two ways: To use drives of multiple libraries, you must enable the parallel processing mode for the libraries that are managed by the media pool.

Parallel processing is enabled in optional media pool settings.

Manage multiple tape libraries and use several or all drives across all managed libraries.

Use multiple drives of one tape library.

You can configure multiple drives in the following ways: 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 use multiple drives simultaneously for writing data to tape.

Parallels 13 user guide