AIX supports the SVC / storwize product natively so you don't need to install SDDpcm and the associated HAS.
The IBM SSIC shows most of the supported options:
https://www-304.ibm.com/systems/supp...perability.wss
Given the mess SDDpcm + HAS can make with being forgotten during AIX updates, or especially during AIX migrations, and that the SDDpcm code is already being integrated into AIX native MPIO, I'd have to think long and hard about whether it's even worth installing these days.
Either way AIX / SDDpcm will cope with lost paths in much the same way as each other, as long as there is an available path you should have nothing to worry about.
Load balance, round robin, Etc, read the docs and make your choice.
Guide to selecting a multipathing path control module for AIX or VIOS
Don't forget to look at the "timeout policy" docs too!
IBM AIX MPIO: Best practices and considerations
Oh, and things like dynamic tracking and fast fail for the fibre interface attributes and the way the two interact....
IBM Knowledge Center
Lots to read, several decisions to make, please feel free to keep discussing things here if anything is unclear - I appreciate it's a bit of a mine field when you are new to this arena.
HTH
Duke.