Re: Performance under z/VM 5.1

[McKown, John]

Title: Message

David,

 

I hope some others will chime in, but I'm not sure that moving to LPAR will really help. I assume you will run the clients' z/VM systems each in their own LPAR instead of under your current z/VM. Were you aware that LPAR is, in fact, a sort-of VM and was originally based on VM? The reason that I ask this is because your 3r level guests (z/VSE) are likely getting rotten response due to the fact that the SIE (which reduces z/VM overhead significantly) only goes two levels deep (IIRC). When you replace the current "master" z/VM with LPAR, the LPAR hypervisor will still "use up" one of those SIE levels. So I'm fairly sure that simply replacine a "master" z/VM on a z800 in BASIC mode with an LPAR setup will not really help very much.

 

Question to the audience: Can a z800 run in BASIC mode? Or was that the first machine which did away with BASIC mode? If a z800 does not have BASIC mode, then will replacing a single LPAR running z/VM (and 2nd level z/VMs with 3rd level guests) have any advantage.

 

 

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

This message (including any attachments) contains confidential information intended for a specific individual and purpose, and its content is protected by law.  If you are not the intended recipient, you should delete this message and are hereby notified that any disclosure, copying, or distribution of this transmission, or taking any action based on it, is strictly prohibited.
 

-----Original Message-----
From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Wakser, David
Sent: Friday, July 28, 2006 8:39 AM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Performance under z/VM 5.1

John:

        The answer is very simple: we are an outsourcing company, and some of our clients have their own VM systems. For a variety of reasons (including pesky auditors), we cannot merge the VM systems!

        Thanks for the information - I was really wondering whether devices could be defined as accessible to all LPARs, which you have answered.

David Wakser
InfoCrossing

________________________________

From: McKown, John [mailto:[EMAIL PROTECTED]]
Sent: Friday, July 28, 2006 9:16 AM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Performance under z/VM 5.1

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

This message (including any attachments) contains confidential information intended for a specific individual and purpose, and its content is protected by law.  If you are not the intended recipient, you should delete this message and are hereby notified that any disclosure, copying, or distribution of this transmission, or taking any action based on it, is strictly prohibited.

 

        -----Original Message-----
        From: The IBM z/VM Operating System [mailto:IBMVM@LISTSERV.UARK.EDU] 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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Confidentiality Note: This e-mail, including any attachment to it, may contain material that is confidential, proprietary, privileged and/or "Protected Health Information," within the meaning of the regulations under the Health Insurance Portability & Accountability Act of 1996. If it is not clear that you are the intended recipient, you are hereby notified that you have received this transmittal in error, and any review, dissemination, distribution or copying of this e-mail, including any attachment to it, is strictly prohibited. If you have received this e-mail in error, please immediately return it to the sender and delete it from your system. Thank you.