Ok with the AIX5.3ML11 (> ML8 is were you need to be)
you have 36096 megabytes (36GB) free in the vg to allocate without requiring the need to more disk.
you said you needed approximate 36GB to add so you are going to add it and it will go to these disk drives.

hdisk64 active 199 70 00..00..00..30..40
hdisk65 active 199 71 00..00..00..31..40
hdisk66 active 199 70 00..00..00..30..40
hdisk67 active 199 71 00..00..00..31..40

Since this is SAN disk I will assume that all the raid is handled by the back end. and you are not doing mirroring

with all that said we are going to let AIX find and place the required PP's as needed. But I do have 1 more question.
Why are the disk drives we are going to use only 199 PP's but all the others are 399 PP's.
The SAN should have allocated the same disk size to you for usage.
SO is this correct disk for the system?

Anyway you can do this in smit or

Code:

chfs -a size=+9G /sapdata5qa  (I am also assuming that this is the File System Mount and not the LV)

I would probably just round the 7.75 and the 7.50 GB's to 8.
But if you want the exact you will do the GB size the another for Meg size.

And like all things be sure you have a valid backup before you do this.