What is the engine version?
I have learned that the issue is with the default ulimit under aix - 128M for the data area. It needs to be at least 256M.
So adding a "ulimit -d 262144" before the uvscan command settled the issue.
I wasn't finding it in searches, and such requirements aren't mentioned in the documentation, but the customer, who is the actual customer of mcafee, placed the call for me and conferenced us together. There's also another mcafee site that did have the information. I just didn't it existed to search it.
While I'm at it, I've also discovered that there are rather small limits on the size of an exclude list and of a file list (for --exclude-= and --file=), which I discovered while trying to get rid of the errors from it trying to scan special files. Now I've got to figure out the annoying "permission denied" messages, for a process run as root, against files that are readable. For my automation, I'm going to have to parse the summaries, because those cause it to exit with non-zero status.