> -----Original Message----- > From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On > Behalf Of Stephen Frazier > Sent: 29 May 2009 21:25 > To: IBMVM@LISTSERV.UARK.EDU > Subject: Re: Virtualized Desktop > > Ward, Mike S wrote: > > Hello, all. I have a question. It seems that we are looking into a > > virtualized desktop environment (Single Image) on our distributed side. > > I kind of laugh at this because that's where we came from with VM and an > > OS running under VM (Green Screen) long ago and now it's making full > > circle. In VM how do you determine the amount of hardware MIPS, Disk, > > Etc... for let's say 1000 users? Is there any kind of formula to go by? > > I know in the distributed environment, it will probably take a lot of > > disk space, and as far as performance I don't think it would be as > > snappy as a real VM system. I used to work at a shop where we had 2500 > > users and a few with APL, that's right APL. Anyone that's been around > > knows what APL programmers did for VM. And in that shop response time
Not sure about what APL did for VM but I remember being chucked off MTS for having the largest VM size. It was a weekend and I thought the system would quiet but it was paging to disk that day, and my 10 line program killed the system... .. (it was my undergraduate project and did resource leveling on a Gant chart using heuristic methods..) > > was good even under MVS/CICS under VM. Anyway any comments, suggestions, > > criticisms are welcome. > > > We recently did a POC to see if we could replace about 1000 Windows PC > with thin clients linked to VMware running on HP blades and a HP SAN > storage. The POC worked well with 10 users. We are probably going to > implement it in the next fiscal year. I don't have the costs with me now > but the 10 HP blades that we will need cost more than a z10. > Building PC's capable of running many virtual machines can be expensive, but I would have thought fewer bigger machines would be better value for money. In any case when you consider the number of Network Cards and SAN HBA cards you will need those alone probably come close to small mainframe... On the other hand the support costs of maintaining one image rather than 1000 PCs will probably save you money in the first few days... > -- > Stephen Frazier > Information Technology Unit > Oklahoma Department of Corrections > 3400 Martin Luther King > Oklahoma City, Ok, 73111-4298 > Tel.: (405) 425-2549 > Fax: (405) 425-2554 > Pager: (405) 690-1828 > email: stevef%doc.state.ok.us
