Is there a way in AIX, to 'see' what memory slots are being used or
not? In HPUX, there was an option in diagnostics to get a map of the
memory, which included slot occupation and dimm sizes.

You might get close to this with svmon, though you will not be able to
map logical vmm page to physical memory chip with svmon. I guess it is
possible to somehow obtain access to translation tables used to
translate logical page to physical location, however I dont believe
these tools are documented. In case of an LPAR this is probably 100%
impossible since translation is done outside of AIX instance and within
a hypervisor.

You can try the following command:

lscfg -vp -lmem0 | grep "Physical Location"


HTH,
homeyjoe

Thanks homeyjoe.... lscfg -vp -l mem0 works great and tells me
everything I need to know!

Regards,
Sue