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Thanks for your attention, we disabled the compression in our backup and it did run faster.
I would like to know another thing, if possible: Is there any rule to determine the correct number of channels. I know each channel creates a session and paralellize the backup. For example, the number of channels is related to the number of cpu cores? ... or the number of output devices?
Thanks again in advance.
For disk backups allocate one channel for each physical disk.
The exception to this rule is if you can optimize the backup for your disk subsystem architecture with multiple channels.
Failing to allocate the right number of channels adversely affects RMAN performance during I/O operations.