On Friday, 11/05/2010 at 12:23 EDT, "Schuh, Richard" <[email protected]> 
wrote:
> Both HDS and EMC have provided CP updates to the CCW translation tables. 
In 
> fact, for 6.1 IBM has included the updates that HDS has supported for 
the last 
> several releases. With those updates in place, there is no need to treat 
the 
> DASD as unsupported devices.

It apparently IS possible to dedicate a device to more than one guest 
(tricksy, it is).  While doing some IOCP research, I came across this in 
the description of the CNTLUNIT statement for IOCP:  "When you are running 
VM with guest operating systems, you can use multiple CNTLUNIT statements 
for a single physical control unit in certain environments to effectively 
dedicate the same physical devices to more than one guest. This technique 
involves potential path-grouping considerations that create operational 
complications. Ensure you have determined possible consequences and that 
you use caution if employing this technique."

Caveat emptor.

Alan Altmark

z/VM and Linux on System z Consultant
IBM System Lab Services and Training 
ibm.com/systems/services/labservices 
office: 607.429.3323
[email protected]
IBM Endicott

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