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RMAN backupsets to disk - how to parallelize?

Is there any way to utilize Oracle RMAN backup parallel features via BR*Tools when performing backup to disk?

Platform: Windows if it is relevant, Oracle

The only way I found so far is to use exec_parallel parameter in BRTools profile and in this case parallelizing done via starting n processes of RMAN in parallel when each makes backup of separate datafile. The aim is to do something with BRTools parameters to get parallel option 'inside' RMAN (equivalent of "RMAN> CONFIGURE DEVICE TYPE disk PARALLELISM n;").

The other part - how to parallelize offline redo log backups for RMAN backupsets? Even having exec_parallel parameter set to >1 only one process of BRARCHIVE is processing all offline redo logs serially.

BR*Tools parameters which I changed from baseline:

backup_mode = full

backup_type = online

backup_dev_type = disk

archive_function = save_delete

disk_copy_cmd = rman_set

rman_compress = yes

rman_cross_check = arch_force

exec_parallel = 4

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