HSZ22 controller max disk in RAID5

[WilliamSmith11]

Hi everybody.
This is my case:
I have a customer that have a raid5 configured in this HSZ22 controller , my question is .

-How many disk of 36 GB can be configured in one RAID5 , at this momments there are 3 disk in raid5 he want add more disks to this raid5.

-The matter is that he is presenting this rais5 to a unix system and he is out of space.
He say that he have LSM and ADVFS licence running in this system.

-If I add other disk to the raid5 how I increase the size of the existing files without lose the data?

thank you.