On Fri, 30 Aug 2013 21:22:02 -0400, Robert A. Rosenberg wrote:
>
>I know for multi-volume datasets UNIT=(TAPE,2) handled the mount of
>volume3 while volume1 rewound and unloaded. I do not remember if you
>could allocate 2 units and have concatenated input volumes alternate
>between them. AVR might have helped since it say "Find the device
>with the Tape Volume and allocate the DD to it" but I do not think it
>would handle the case where you want to reuse a drive where the tape
>has unloaded - It was for allocation at step start.
> 
I know from experience that AVR is ineffective once the OS has issued
the mount message to the console.  If I've been tardy mounting a tape,
I must read the console message; dismount the tape; and move it to
the drive requested.  (It may have been for scratch requests; again,
there's no response to tell allocation, "The scratch tape you need is
already mounted on drive nnn; use it!")  PITA.

-- gil

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