Hi,

Both of NetWorker 7.6.3 & 8.0 supports AIX 7.1

Fore more details, refer to:

http://powerlink.emc.com > Home > Support > Interoperability and Product Lifecycle Information > Compatibility Guides > NetWorker Software Compatibility Guide 

Also, you will check the NetWorker 7.3 (and Later) Hardware Compatibility Guide

Regards,

Mustafa