RAC Newbie: Does RAC on AIX require HACMP?

I've never installed/configured RAC before, and the documentation I'm finding has conflicts on whether HACMP needs to be installed. One FAQ states the following:
Is HACMP needed for RAC on AIX 5.2 using GPFS file system?
The newest version of GPFS can be used without HACMP, if it is available for AIX 5.2 then you do not need HACMP
Another documentation article states HACMP is REQUIRED for 9i RAC on AIX.
Does anyone know the real answer to this question? Our configuration is AIX 5.3, GPFS 2.1, Oracle 9.2.0.4. Thanks in advance!!

The latest information from Oracle says:
Oracle9i RAC always requires HACMP.
HACMP is optional for Oracle Database 10g RAC.
See details in metalink note
IBM General Parallel File System (GPFS) and Oracle RAC on AIX 5L and IBM eServer pSeries
Note:302806.1
Werner

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Is anyone using the combination in the subject line?
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RAC Newbie: Does RAC on AIX require HACMP?

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