iirc the z990 cannot run in basic mode, which was always a prereq for multiple preferred guests. When running under PR/SM the MHPGF would be taken by PR/SM. Running multiple preferred guests will require something like 2nd level zones, unless PR/SM has changed such that it no longer uses the MHPGF.
Jan Jaeger.
From: Jim Elliott <[EMAIL PROTECTED]> Reply-To: Linux on 390 Port <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] Subject: Re: OT: Intel gets virtualization clue? Date: Tue, 7 Oct 2003 20:57:26 EDT
>> This was further enhanced in announcements on June 11, 1987 >> with the VM/XA System Product and the Multiple High >> Performance Guest Support facility (MHPGS) and February 15, >> 1988 as the Processor Resource/Systems Manager (PR/SM) which >> provides the Logical Partitioning facility (the first ever >> reference to Logical Partitions to my knowledge).
> True. Before that they were called "domains" and you could only > get them from Amdahl. The PR/SM announcement remains one of the > very few to offer pronunciation guidelines.
The Amdahl Multiple Domain Feature (MDF) was a different implementation from that in the 3090, with somewhat the same goals. The big difference with PR/SM is that it could be used by z/VM to provide preferred guests or LPAR to provide Logical Partitions.
In any case, the Intel Vanderpool architecture is much closer to SIE than to MDF or PR/SM.
>> The current VM product, z/VM, makes extensive use of this >> function to provide support for running a great many guests >> (in some environments 100s) and the current LPAR support >> provides for 60 Logical Partitions on the z990 mainframe.
> According to the preview PDF for today's announcements that I > received late yesterday, 60 LPARs is still a Statement of > Direction.
Correct, a typo on my part. With today's announcement 30 LPARs are available on the z990 with the SoD being 60 LPARs.
Regards, Jim
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