On Fri, 2 Aug 2013 03:23:29 -0500, Victor Zhang wrote:

>Hello,
>I am going to test maximum backup speed using adrdssu to virutal tape storage, 
>I want to memory/virtual storage as source  and is it possible to create a 
>temp dataset in VIO, then write it to the virtual tape storage via adrdssu?
>

No. 

"2. DFSMSdss does not support virtual input/output (VIO) devices."
http://publib.boulder.ibm.com/infocenter/zos/v1r13/index.jsp?topic=%2Fcom.ibm.zos.r13.adru000%2Fu2010.htm&path=10_22_3_1_2

Norbert Friemel

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