>Excellent post. I might add that on operational systems that are smallish
>(<10G each LPAR) I have *NEVER* been able to get the storage to
>successfully go offline (testing on zSeries hardware).
>Even on my sandpit - IPL, config it on, do some displays, config it off.
>Nothing.
>Waited all day on one occation. Note, no users - not even TSO.
>IRD not active on the CEC

   Do a D M=STOR periodically while the CF STOR is in progress.
It will identify the pages that it is trying to get offline.  If this data 
changes, 
then progress is being made.  If it remains static, it is usually 
identifying
pages which have been fixed for a long period of time, but the PGSER FIX
inappropriately specified LONG=N, or pages which are fixed by an address
space which became nonswappable for a long period of time via a 
SYSEVENT DONTSWAP which should have been a SYSEVENT TRANSWAP.

  Also,  some work was done in z/OS 1.5 to improve the performance
of CF STOR OFFLINE processing. 

Jim Mulder   z/OS System Test   IBM Corp.  Poughkeepsie,  NY

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