Re: Performance under z/VM 5.1

[McKown, John]

Title: Message

Why move devices? I hope you are using ESCON connections. Just use EMIF to define all the devices to all LPARs. That's what I do here. We share all our disk and tape devices. Some ESCON devices cannot be EMIF'ed such as 2074 controllers (we use a Visara for our consoles and it does support EMIF).

 

If I understand you correctly, you have a single LPAR on the z800 running z/VM. Under that z/VM, you are running second level z/VM's. Under the second level z/VM's you are running z/VSE (third level). My question is: "Why?" Why have those second level z/VM systems? Why don't you run the z/VSE systems under the first level z/VM instead?

 

 

--
John McKown
Senior Systems Programmer
HealthMarkets
Keeping the Promise of Affordable Coverage
Administrative Services Group
Information Technology

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-----Original Message-----
From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Wakser, David
Sent: Friday, July 28, 2006 8:04 AM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Performance under z/VM 5.1

All:

        One of our CPUs (z800 box) was recently set up with z/VM 5.1, not in LPAR mode. The trouble is that we run several 2nd-level VMs and the performance on that box has been miserable (some of the VSE machines had to be moved off, due to performance problems).

        From my reading, I have gathered that the correct way to handle this is to put the 2nd-level VMs (and their VSE systems) on their own LPAR.

        My question: never having been involved with LPARs, how difficult (or easy) is it to be able to move devices from one LPAR to the other quickly? That is my main concern. We have multiple CPUs and need to be able to move tape, disk, and printers around quite often. And, in the same CPU, we often need to mode OSA connections. Is all of this doable?

David Wakser
InfoCrossing

       
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