>>>Since one can specify MACHINE=XC and define a 31-bit-only virtual >>>machine, any thoughts on whether it would it be "legal" (in the US) to >>>IPL z/OS 1.5 (effectively in "ARCHLVL=1" mode) on that virtual machine >>>for D/R testing if the real machine is a z/Box? >>I don't see why not, it is legal to us the bi-modal support mod which >>allows you to run 31-bit mode at a DR site as long as you want. (the >>6 month limitation does not apply to DR). >Bimodal Accommodation absolutely stopped with z/OS 1.4. It does not bear >on the original query.
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. 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? 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. I don't think there's a legal impediment, but I would get a second, formal opinion. - - - - - Timothy F. Sipples Consulting Enterprise Software Architect, z9/zSeries IBM Japan, Ltd. E-Mail: [EMAIL PROTECTED] ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
