Yes, it does, like the 180 of your car does: it specifies the capacity. Remember: MSU stands for Million Service Units. If you let the machine run for one hour on full load, it will consume 655 MSUs.
Again: ask the vendor for the details of his definition. Kees. > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] On > Behalf Of Sankaranarayanan, Vignesh > Sent: 17 October, 2017 10:03 > To: [email protected] > Subject: Re: Potential stupid question - MSUs > > Thanks Tim and Kees for your clarifications. > > The 'hour' doesn't mean anything then.. ? from the MSU definition (MSUs > is an hourly measure (A million service units (MSU) is a measurement of > the amount of processing work a computer can perform in one hour) > > For the vendor bit... > Assuming my machine's capacity is x MSUs and a vendor's contract > specifies a usage limit of y MSUs (where y is slightly less than x), > One of these 2 things must be true - a) the vendor is probably rounding > down a bit, from the machine's capacity b) vendor has some mechanism to > check and arrest usage real-time. > > - Vignesh > Mainframe Infrastructure > > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] On > Behalf Of Timothy Sipples > Sent: 17 October 2017 08:11 > To: [email protected] > Subject: Re: Potential stupid question - MSUs > > Vignesh Sankaranarayanan wrote: > >1. If a machine is rated at, for example, 655 MSUs, does this mean > >that it can go on up to 655 total MSUs in an hour or 655 at any instant > > It can run at 655 MSUs for any length of time the machine is running. > > As an analogy, imagine that you have an engine that is capable of > running at up to 2700 revolutions per minute (RPMs) continuously. (Some > aircraft engines are exactly like this.) That means you can run the > engine for 5 seconds at that rated speed, 5 minutes, or 5 hours. As long > as you have enough fuel, I suppose. But it's all still at the same > maximum output over that period of time: 2700 RPMs. > > Now, just because the propeller is spinning at 2700 RPMs doesn't > necessarily mean it's doing *useful* work or generating any particular > amount of real-world output (thrust). That's a separate concept. If the > airplane engine is bolted to a stationary test stand, for example, > there's no flight happening. That's also true of mainframes and MSUs. > Those MSUs can be spent running a mission critical sort job, or > processing credit card transactions, or Tweeting lines from > Shakespeare's plays, or all of the above concurrently. Whether those > particular workloads are "useful" is a separate question. > > Extending the analogy, some engines have a rated time limit at certain > output levels, so they might allow 2800 RPMs for up to 5 minutes, up to > 2600 RPMs otherwise. In aircraft engines that's fairly common, and it's > usually called "maximum takeoff power" or something like that. In z/OS a > broadly similar concept is possible, colloquially called a "softcap." > > Water, oil, and gas pipelines are conceptually similar. They allow a > maximum flow rate, in liters per minute for example, and you can send up > to that flow rate through the pipeline for any length of time -- for 5 > seconds, for 5 hours, for 5 years, assuming the pipeline is in good > operating condition. It's all the same basic idea. > > >2. If a vendor's license says, "you can run it on cpu xyz", and the > >contract says 500 MSUs, does this again mean an hourly 500 total MSUs > >or 500 at any given instant. > > Unless the contract is quite unusual, it *probably* means the same thing > as above, but that's perhaps for courts and lawyers to decide if there's > a dispute. And it's possible that the vendor has their own, separate > definition for "MSUs." You could always ask the vendor, of course. > > ------------------------------------------------------------------------ > -------------------------------- > Timothy Sipples > IT Architect Executive, Industry Solutions, IBM z Systems, AP/GCG/MEA > E-Mail: [email protected] > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, send > email to [email protected] with the message: INFO IBM-MAIN > > MARKSANDSPENCER.COM > ________________________________ > Unless otherwise stated above: > Marks and Spencer plc > Registered Office: > Waterside House > 35 North Wharf Road > London > W2 1NW > > Registered No. 214436 in England and Wales. > > Telephone (020) 7935 4422 > Facsimile (020) 7487 2670 > > www.marksandspencer.com > > Please note that electronic mail may be monitored. > > This e-mail is confidential. 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