The real recommendations are found in "Setting Up a Sysplex", 
section "Considerations for All Couple Data Sets", bullet labeled "Performance 
and Availability Considerations" (http://publibz.boulder.ibm.com/cgi-
bin/bookmgr_OS390/BOOKS/IEA2F180/3.1?
SHELF=IEA2BK80&DT=20070502150700).  Health Checker is just an 
implementation of these recommendations.

The current recommendation is to place the sysplex and CFRM primary CDSes 
on separate volumes.  There is no longer any recommendation to separate the 
Logger primary CDS from either of those two.  Health Checker is being updated 
in an upcoming release to reflect this change.

     Bill Neiman
     XCF Development

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