How you use OS-level commands to backup your database depends on your environment. Since you are using AIX, you...
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might be able to use tar for this operation. However, RAC can make things more complex. Is your RAC file system a RAW file system? An ASM file system? Or a clustered file system? If you're using a clustered file system, then you can use tar. If you're using a RAW file system, you can use the dd command. In all cases, using RMAN will back up your RAC database regardless of the file system.
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