Skip Robinson wrote:
By all means *start* your 64-bit testing on the most disposable LPAR you have regardless of size. However, certain 64-bit problems *will not* show up in an LPAR that has less than 2 gig of memory. Before going to production in a >2 gig LPAR, you must somehow build a large test LPAR if only temporarily. Otherwise you may be in for some nasty surprises.
If you have z/VM, define your real storage discontiguously. When we first tested our 64-bit support, we defined two 192MB real memory segments for the z/OS guest: 0 through 192M and 2G through 2G+192M for a total of 384MB of real.
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