> -----Original Message-----
> From: IBM Mainframe Discussion List On Behalf Of Timothy Sipples
>
> [ snip ]
>
> Right, z/OS Bimodal Migration Accommodation is/was available only up
> through z/OS 1.4. When running z/OS 1.5 (at least not under z/VM) on a
> z/Architecture system it has to IPL in 64-bit mode -- that's a
technical
> requirement at least. z/OS 1.5 can run in 31-bit mode on a
> pre-z/Architecture system. (It's the last z/OS release able to do so.)
>
> I very confused, though, so maybe John Chase can post a follow-up. I
> understand the configuration:
>
> - z/VM (with a 31-bit VM defined)
> - z/OS 1.5 (IPLing in 31-bit mode)
> - z/Architecture system
>
> Effectively z/VM is acting as the bimodal accommodation here. I assume
> z/OS 1.5 will IPL this way (and won't figure out what the real iron is
> underneath), but I don't know that for sure.
Ed Jaffe responded that that won't work (gets a disabled wait state
early on), and since he's "in the business" of trying out those kinds of
things I believe his response can be accepted as definitive.
> What I'm really missing is
> what this z/OS VM is supposed to be D/R backing. Is it intended to be
a
> D/R environment to stand in for a pre-z/Architecture system running
z/OS
> 1.5 in 31-bit mode? In other words, is the primary system (for this
z/OS)
> a pre-z/Architecture system?
Yes.
> There's an end of service date coming up on z/OS 1.5 (and prior) of
March
> 31, 2007, so another question would be whether it makes sense to
create
> this configuration with t-minus 12 months of service life.
We perceive it as a SOX requirement to recover our current Production
system at D/R. Though we are currently upgrading to z/Architecture
hardware (and z/OS 1.7), we will not "be there" before our next D/R
test.
> I don't think there's a legal impediment, but I would get a second,
formal
> opinion.
Has been requested.
-jc-
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