On Wednesday, 09/16/2009 at 07:14 EDT, "Gentry, Stephen" <stephen.gen...@lafayettelife.com> wrote:
> Further, and in the same manual, it states that you can clear each T-DISK > before it is reassigned. It depends on your point of view but this seems > contradictory. Clear, in my opinion, means the T-DISK created with the DEFINE > command is completely cleared. Of course clearing cylinder 0, in effect, makes > the area unreadable. Also one section of the manual seems to say that the area > is cleared at IPL time, the other section seems to say it is cleared before it > is reassigned. Clearing cyl 0 only does not prevent you from reading the other cyls on the volume; it simply stops you from mounting it in the "usual" fashion. The z/VM Secure Configuration Guide tells you to enable CLEAR_TDISK in SYSTEM CONFIG. If you configure your system much the way it is described in that book, your auditor won't have any arguments with you. Alan Altmark z/VM Development IBM Endicott
