I'll echo Shane's comments.  We were running several OS/390 LPAR's and a 
CF on a 2-CPU z900.  Never, EVER, again!!!  Our response time from the CF 
partition was 10-20 times worse than a dedicated CF.  Performance was 
terrible.  The technical staff feared for their safety at every turn. 

We added an ICF and have never looked back.

You will not be happy and your management will not be happy, regardless of 
the savings...

Ned Hedrick
Sr. Mgr., Systems Administration
ACI Worldwide

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I can - it'll be awful. Especially if the machine is anywhere near (CPU)
committed. The more LPARs, the worse the PR/SM dispatch interference.
I run a similar config at one customer, and use the CF only for LOGREC
and GRS Star. The Star response times are between one and 2 orders of
magnitude worse than what I would expect from placing the structure in
an ICF.
Yes, *at least* 10 times worse.

May, or may not, be indicative, but I have forbidden the DBAs even
considering data-sharing. They concurred.

Plans are in the final stages to remove the CF, and go back to a ring
(of monoplexes). The M??(?) thingies can be better used elsewhere.

Shane ...

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