In that same time frame (mid 90s), our primary CFRM was so busy that we could not XRC mirror it. That's no longer true. But yes, three volumes are the minimum IBM recommendation. Other that keeping the three named primaries on separate volumes, all other couple data sets can apparently be placed anywhere.
Ted MacNEIL
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>IXCH0243I For each couple dataset type the primary and alternate reside on
different volumes this is consistent with the IBM recommendation.
It used to be recommended that certain primary and alternates be
flip-flopped over two volumes.
I have always believed they should be spread over more than two.
Also, I have never understood why there is so much I/O to disk with CF's
being around.
I implemented my first SYSPLEX in 1994, and I never got an answer to that
question -- other than 'because'.
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