> -----Original Message----- > From: The IBM z/VM Operating System > [mailto:[EMAIL PROTECTED] On Behalf Of Alan Altmark > Sent: Wednesday, March 26, 2008 2:26 PM > To: IBMVM@LISTSERV.UARK.EDU > Subject: Re: z/VM - Lightweight specific purpose file system > > > On Wednesday, 03/26/2008 at 03:17 EDT, David Boyes > <[EMAIL PROTECTED]> > wrote: > > z/OS doesn't run because it deliberately issues an > instruction subcode > > that is not implemented on an IFL and then craters in a > specified way > > when the instruction fails. > > One might infer from your characterization that z/OS added code to > intentionally crater itself on an IFL, and that would be incorrect. > > Alan Altmark
In reality, IBM changed the microcode which loads on an IFL to cause that particular function to get a "check stop" (IIRC) condition. six of one ... IBM has made it impossible to run z/OS on an IFL. As is their right. And that is GOOD in that it allows other OSes such as Linux to be cost effectively run on a z. It also got IBM to thinking about "speciality" engines and out came the zAAP and zIIP. Both designed to allow some special types of work to run without impacting the z/OS software cost. Very smart! -- John McKown Senior Systems Programmer HealthMarkets Keeping the Promise of Affordable Coverage Administrative Services Group Information Technology The information contained in this e-mail message may be privileged and/or confidential. It is for intended addressee(s) only. If you are not the intended recipient, you are hereby notified that any disclosure, reproduction, distribution or other use of this communication is strictly prohibited and could, in certain circumstances, be a criminal offense. If you have received this e-mail in error, please notify the sender by reply and delete this message without copying or disclosing it.
