Funny, there was a session on just this stuff at the z Expo a few weeks ago, and I had the handout handy.
Max paging volumes: 255 (number of CP volume slots) Max real storage supported: 256GB, however higher has been tested. I've heard reports of VM being driven with something like 47,000 Linux guests, but I don't believe they were doing much. We have over 100 on our busiest system, and it's not heavily loaded. Highest sustained I/O rate would depend on architecture. FICON can handle much higher rates than older architectures, and under the right conditions, I've managed to saturate a 2GB. FCP channel. Best I got out of a single FICON channel with no contention was 60MB/sec. This will vary a lot with different hardware configurations. Sorry, no idea about the coupler stuff. -----Original Message----- From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On Behalf Of Gary M. Dennis Sent: Wednesday, October 28, 2009 3:31 PM To: IBMVM@LISTSERV.UARK.EDU Subject: [IBMVM] Questions - zVM Limits/Hardware Support Questions... What is the maximum page space supported by zVM? What is the supported real storage limit for the hardware and for VM itself? Does anyone have experience with a zVM system having over 500 non-CMS guest systems? What is the highest total sustained I/O rate you have witnessed on a VM system? I see from an BM presentation that support is available for simulated guest coupling. Does zVM support a real coupler facility for intersystem (VM SYSTEMS) communications? Thanks --. .- .-. -.-- Gary Dennis Mantissa Corporation -------------------------------------------------------------------------- This message w/attachments (message) may be privileged, confidential or proprietary, and if you are not an intended recipient, please notify the sender, do not use or share it and delete it. The information contained in this e-mail was obtained from sources believed to be reliable; however, the accuracy or completeness of this information is not guaranteed. Unless specifically indicated, this message is not an offer to sell or a solicitation of any investment products or other financial product or service, an official confirmation of any transaction, or an official statement of Merrill Lynch. Subject to applicable law, Merrill Lynch may monitor, review and retain e-communications (EC) traveling through its networks/systems. The laws of the country of each sender/recipient may impact the handling of EC, and EC may be archived, supervised and produced in countries other than the country in which you are located. This message cannot be guaran teed to be secure or error-free. References to "Merrill Lynch" are references to any company in the Merrill Lynch & Co., Inc. group of companies, which are wholly-owned by Bank of America Corporation. Securities and Insurance Products: * Are Not FDIC Insured * Are Not Bank Guaranteed * May Lose Value * Are Not a Bank Deposit * Are Not a Condition to Any Banking Service or Activity * Are Not Insured by Any Federal Government Agency. Past performance is no guarantee of future results. Attachments that are part of this E-communication may have additional important disclosures and disclaimers, which you should read. This message is subject to terms available at the following link: http://www.ml.com/e-communications_terms/. By messaging with Merrill Lynch you consent to the foregoing. --------------------------------------------------------------------------
