A couple of things.

Are you sure you want RAID5 on SATA?

What RAID5?  3+1 or 7+1? 

Are you planning on putting those in the same pool with the 1TB drives?

The most important thing is to have the same number of TDATs on each drive.

From my calculations, a 2TB drive has 1,915,210 cylinders.

So the total usable capacity is that times 3 for 3+1 or 5,745,630

The largest hyper you can create is 262,668, but that won't go in evenly.

So I would create 22 3+1 TDATs on each set of 4 drives size of 261,165 and repeat for a total of 638 TDATs.

Thanks for the concept and all the TDAT no's and cyl sizes match to my existing below DG's (table below) and that is what I am looking for.

        There is one quick thing that did not match 2 TB = 1915210 Cyl as basing on below

Cylinders = GB / 15 / 128 / 512 * 1024 * 1024 * 1024

2236962  = 2048/ 15 / 128 / 512 * 1024 * 1024 * 1024         ??? Plz correct me if I missed something

You are right . Great and thanks a lot for your help. You made my day

I looked at the drive in SymmWin and it had DB2DADD1 blocks. 

I know that the 2TB drive is formatted differently than the 1TB drive to gain performance, but some capacity is lost.

You can see the actual cylinder count on your drives with the symdisk list -cyl command.

Will configure and let you know how it goes.

Although you may want to use the "free" count.  I doubt it will let you use more than is free.

Hi Quincy

    This is what my SA recommeded finally and I carved with this measurements

The number of TDATs should work out so that every disk has the same number of them.

If not, have the SA do it over, or have them talk to me.