Hi Herbert, Thanks for your advice. --- Herbert Poetzl <herbert@13thfloor.at> wrote: > > Please explain in more detail. On installing the software of > virtual > > machine they don't request alloting XYZ MB RAM. > > you have a 'kernel' per guest, and all the > resources, like files or memory cannot be > shared between virtual machines, thus if you > have 10 machines running you will use 10 times > the resources as if one machine (real or virtual) > is running If I have 4 virtual machines running on the same box simultaneously I need 4 times the resources calculated on each virtual machine running on its own box. Then it needs a powerful PC, at least 2 quadcore CPUs with >8G RAM onboard. I have no idea about max RAM able to run on a server motherboard. I'll do some search later. How about the guests? They also consume resource. Thanks. > the project name is Linux-VServer and I hope that > answers your question, if not, the technology > is based on OS level virtualization, which means > it uses a shared kernel, instead of virtual machines Noted and thanks. > as long as Windows(tm) doesn't use a Linux kernel > it won't be supported :) Noted with thanks. It is not a serious matter to me. I use them for test only NOT for production. What about Windows servers? Can they run on OS level virturalization? > the advantage of OS level isolation/virtualization > is that you only need a fraction of the resources > than for full virtualization, which allows you > to run hundreds of guests inside a recent machine It sounds wonderful hundreds of guests running on one powerful PC. I'll run them as daemons. I have following 2 thoughts to consider. 1) If the PC is down because of hardware failure then hundreds of server will be down. It needs a well established replication and load balancing. 2) It needs a range of fixed/public IP address serving hundreds of server on the Virtual box. I'm investing whether there will be a way to overcome this difficulty. Each server has its own hostname and domain. If hundreds of domain pointing to one fixed/public IP address is there a device able routing them to respective server. I have been posting this question on Vyatta forum without response. Are there any suggestions? TIA B.R. Stephen Send instant messages to your online friends http://uk.messenger.yahoo.com