- One point is that you gain virtually nothing by 6 volume groups. You can
put the six LUNs in a single VG, no performance difference I believe.

- Have you tuned the queue_depth of the LUNs based on AMS documentation.
Check it by "lsattr -El hdiskX"

Here is my question from the group:
Which one performs better?
a- One big TSM volume on a 2TB LUN
b- More than one TSM volumes on a 2TB LUN

Thanks