I think you must be able to trick this with Storage Groups and Tape pools. 
In SMS you assign the data to a Storage Group.
In the TS7740 the Storage Group is assigned to a Physical Volume Pool. 
The Physical Volume Pool takes its scratch tapes from Pool 0. 
If you move all Physical volumes from Pool 0, the Physical Volume Pool assigned 
to the Storage Group has no physical tapes to borrow and write tp. 
I wonder when the TS77440 will start protesting, but probably only when the 
cache will start to fill up.
Let me know if this works.

Kees.


-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf 
Of Pommier, Rex
Sent: Thursday, June 04, 2015 6:46 PM
To: [email protected]
Subject: TS7740 question

Hi All,

Is there any way to configure all or a portion of a TS7740 to not write cache 
data to back-end tapes?  

Here's the situation I am facing.  I have a TS7720 without any tape drives.  
Our DR facility has only a TS7740.  We are preparing for a test and we don't 
want to have to provide back-end (stack) tapes for the test.  Is there any way 
we can configure the TS7740 to not write to stack tapes?  We are confident that 
any data we write to the TS7740 will comfortably fit onto the cache.

TIA,

Rex

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