Thank you, John.
I think you settled it! Suleiman Shahin 10,017 cylinders is max CMS 3390 mdisk size according to section CMS Restrictions in 'CMS Planning and Administration' manual. But then a footnote says 'CMS is limited to 32767 cylinders' _________________________________________________________________ Hotmail: Free, trusted and rich email service. http://clk.atdmt.com/GBL/go/171222984/direct/01/