The minimum system requirements for this release are:
Note
SP4 was not available at the time of this release. Veritas 5.0 products also operate on AIX 5.3 with SP3, but you must install an interim fix. See the following TechNote for information on downloads, service pack availability, and other important issues related to this release.
http://support.veritas.com/docs/282024
Veritas 5.0 does not support AIX 5.1.