So if your CPU is also too high during RMAN backups, consider two options:
- use hardware compression in your tape unit. In this case don't use compression, or if it's your corporate policy use 'NONE' as the algorithm by the following RMAN command:
CONFIGURE COMPRESSION ALGORITHM 'NONE';
- Use one of the advanced compression options. My recommendation for System z is to use the 'MEDIUM' compression algorithm. This corresponds to a basic zlib compression and offers a good trade of between CPU consumption and compression ratio on System z. The required command is:
CONFIGURE COMPRESSION ALGORITHM 'MEDIUM';
Note that for this option you will need the "Advanced Compression Option (ACO)".
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