A long time ago I wrote a small EXEC to DDR cylinder zero from my real 
volumes to an alternate location.  Doing that does both of preserveing cyl 
0 contents and preventing duplicate volsers when copying cyl 1-END.

Brian

On Mon, 30 Jan 2006 06:47:25 +0100, Kris Buelens <[EMAIL PROTECTED]> 
wrote:

>The allocation maps is something rarely changed.  But there are two other
>thing in cyl 0 too
>
>- the SAPL program, alongside its default IPL parms
>- the "pointer" to the active CP directory (there are two copies of the CP
>directory, the alloc map tells which is active)
>
>So I'd flascopy cyl 1-end, and copy cyl 0 only if you change it.  To make
>the directory "current"' simply issue a DIRECTXA (ir DIRM DIRECT)
>
>Kris,
>IBM Belgium, VM customer support
>=========================================================================

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