Hi, I think there is another factor involved. On x86 you usually run database engines etc with very large caches to avoid going to disk. On z this is much less of a penalty because of the powerful I/O subsystem. I have some experience with this as we moved our SAP systems from z to x86 as part of a strategic directive to focus on one platform. We ended up running the same systems with about ten times the amount of memory on the databases to get like performance. Both platforms were virtualized (Linux on zVM with DB2 versus Windows on VMWare with MSSQL).
Best regards, Pieter Harder -----Oorspronkelijk bericht----- Van: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] Namens PROT Pierre-François Verzonden: dinsdag 2 februari 2016 14:45 Aan: LINUX-390@VM.MARIST.EDU Onderwerp: Re: TCO comparison Intel vs EC12 IFLs Hello, I also often hear the same argument from IBM about the amount of memory required would be lower z. I think this argument is essentially a commercial argument that makes sense for a migration from Linux standalone x86 not virtualized machines t to linux on ZVM. In this case, with memory overcommint at zVM level, yes there is a gain of memory (related to virtualization) But, if you compare linux on vmware and linux on ZVM, I see no reason why that memory consumption is lower. In practice, we migrated a COBOL application from Pseries to Linux on ZVM. We tried to reduce the required memory size, so we started with a small memory size. But we had to to increase the memory and we are finally on the same size as we used to be no Pseries. Best Regards. -----Message d'origine----- De : Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] De la part de Eduardo Oliveira Envoyé : lundi 1 février 2016 19:19 À : LINUX-390@VM.MARIST.EDU Objet : Re: TCO comparison Intel vs EC12 IFLs You would need to qualify the situation... there is no magic formula to convert x86 cores to IFLs, each case depends upon many variables, for instance: - Which Intel X86 technology is being consolidated? - How fast is the x86 clock? - How much is the x86 server utilization? - What type of workload? I co-wrote a paper a while ago about sizing. Although 10 years old, this paper still reflects the proper sizing methodology and, to be current, it would only require newer data reflecting modern technology. You can find the paper here: https://www-03.ibm.com/support/techdocs/atsmastr.nsf/5cb5ed706d254a8186256c71006d2e0a/1c76a8c5aa63c3b28625723a0026816b/$FILE/Linux%20on%20System%20z,%20an%20end%20to%20end%20view.pdf This paper does not talk about TCO, but about the sizing methodology itself. On the TCO side, as mentioned earlier on one of the answers to your question on this forum, you will need to consider many areas on top of the acquisition costs, such as: space, cooling, power usage, SW licensing, admin costs, and many more. If you need examples there are plenty of references on the internet to indicate the areas to be considered on a detailed TCO study. Also the amount of memory required to run equivalent work is normally less on the z Systems than the aggregated memory from the x86 systems. Thanks. Best Regards / Abraços / Abrazos, Eduardo C. Oliveira, M. Math. WW IBM Wave Tiger Team Lead / Executive IT Specialist Washington Systems Center – zGrowth Open Group / IBM Wave / RACE / Fit for Purpose / Linux on z / Virtualization / zChampion Alumni From: "Will, Chris" <cw...@bcbsm.com> To: LINUX-390@VM.MARIST.EDU Date: 02/01/2016 12:39 PM Subject: TCO comparison Intel vs EC12 IFLs Sent by: Linux on 390 Port <LINUX-390@VM.MARIST.EDU> Any TCO comparisons of Intel x86 processors (vmware) vs EC12 IFLs that is not authored by IBM? We are comparing costs on a EC12 14 IFL system running WMB, WAS, and DB2 vs running this on an x86 solution running vmware. Looking for information on how many x86 cores would be needed to replace the EC12 IFLs. Chris Will The information contained in this communication is highly confidential and is intended solely for the use of the individual(s) to whom this communication is directed. 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