As far as I know, If you do not specify a UNIT Type, it will look for volumes 
that are STORAGE.
If there aren't any, the allocation will fail. 

-----Original Message-----
From: IBM Mainframe Discussion List <[email protected]> On Behalf Of 
ITschak Mugzach
Sent: יום ד 20 מרץ 2024 08:57
To: [email protected]
Subject: TSO ALLOC with/wo unit

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I have a program in Rexx that allocates a dataset using dsname and volume 
serial (1) . it works well in my shop but requires a unit type (2) in another 
shop. Actually the error is msg "IKJ56241I SPECIFIED UNIT IS UNDEFINED".
Why does 1 work here and fails in another shop?

   1. ALLOC F(XXX) DA('dsname') VOLUME(volser)
   2. ALLOC F(XXX) DA('dsname') VOLUME(volser) UNIT(390)

ITschak

ITschak Mugzach
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