How about savings in power consumption. If configured correctly a virtual server won't cost you anything. Well, hardly anything.
Running a dedicated server you must size the server for it's peak load. In VM you run multiple servers and if their peak load doesn't overlap you don't need to size for the total peak load. So 10 '1 IFL' servers can run in perhaps only a 2 IFL LPAR. It also means that you can add servers without the immediate need for additional hardware. Note that the utilization is both CPU and storage. You should monitor both CPU and storage (page) loads. Those two will determine the numbers. IMHO, size an LPAR for peak load of a large, high CPU guest, such as a busy DWH machine. Then look at small low utilized servers you can add without the need for additional hardware. For instance some small apache or samba servers etc. Actual numbers is very hard. 2 to 50 perhaps. But we do have a dozen guests that could be 100 per IFL since they are paged out 95% of the time. Obviously these are not running large production loads. Regards, Berry. Op 06-12-10 18:07, John Cousins schreef: > Here we go again! > Without success, we've been trying to get the IT department here to adopt > z/Linux since 2003! > > Our zVM licence has been recently cancelled, and I have just had a request > from our Enterprise Architects for some costing for z/Linux as they need to > compare server virtualisation costs with VMware! > > One problem of trying to get a cost per virtual server was always trying to > estimate how many servers an IFL will support. We had a 13 SuSe servers > defined in a z800 IFL but as they were hardly used we couldn't measure a > thing! > > So are there any rules of thumb out there on how many production virtual > servers would run on a Z10 IFL? Obviously it will depend on server > utilisation, guess that will need to be estimated as well? > > Another question is where do the bulk of the savings come from? From my > investigations over the years other success stories suggest most savings come > from software licensing, e.g Oracle, Tivoli etc. but also from networking > infra-structure by the use of virtual switches. Are there any other areas > that provide benefits? > > Any ideas or constructive suggestions would be gratefully received! > > Best regards > > John > > > > John Cousins > Senior IT Officer > Central Support Services ICT Division > Bristol City Council > Romney House > Romney Avenue > PO Box 1380 > Bristol BS7 9TB > > Tel : 0117 922 4705 > Fax: 0117 922 3983 > e-mail: [email protected] > > ______________________________________________________________________ > 'Do it online' with our growing range of online services - > http://www.bristol.gov.uk/services > > Sign-up for our email bulletin giving news, have-your-say and event > information at: http://www.bristol.gov.uk/newsdirect > > View webcasts of Council meetings at http://www.bristol.gov.uk/webcast > > Bristol is the UK's first Cycling City. Visit www.betterbybike.info to join > thousands of others getting around by bike. > > ---------------------------------------------------------------------- > For LINUX-390 subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO LINUX-390 or visit > http://www.marist.edu/htbin/wlvindex?LINUX-390 > ---------------------------------------------------------------------- > For more information on Linux on System z, visit > http://wiki.linuxvm.org/ > > > ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
