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A number of Virtual Machine Monitor platforms exist that are the basis of many utility orcloud computing environments. The most notable ones, VMWare, Xen, and KVM

. VMWare !"Xi. VM#are is a pioneer in the virtuali$ation mar%et. &ts ecosystem oftools ranges from server and des%top virtuali$ation to high'level managementtools .!"Xi is a VMM from VMWare. &t is a bare'metal hypervisor, meaning that it

installs directly on the physical server, #hereas others may re(uire a hostoperating system. &t provides advanced virtuali$ation techni(ues of processor,memory, and &)*. !specially, through memory ballooning and page sharing, it canovercommit memory, thus increasing the density of VMs inside a single physicalserver.

+in%https://my.vmware.com/web/vmware/info/slug/datacenter_cloud_infrastructure/vmware_vsphere_hypervisor_esxi/5_5?rct=j&=&esrc=s&source=web&cd=!&cad=rja&ved="#$o%j'#&url=https://www.vmware.com/go/download(vspherehypervisor&ei=)*!+,s-sr%e(t0'1'&usg='%j#*#2343r61pmp7gtmg819$fyd(w&sig=b#+jb_h;xr)9,)'&bvm=bv.545)877d.bm@

. Xen. The Xen hypervisor started as an open'source pro-ect and has served as abase to other virtuali$ation products, both commercial and open'source. &t haspioneered the para'virtuali$ation concept, on #hich the guest operating system,by means of a speciali$ed %ernel, can interact #ith the hypervisor, thussignicantly improving performance. &n addition to an open'source distribution ,Xen currently forms the base of commercial hypervisors of a number of vendors,most notably /itrix Xen"erver and *racle VM.

+in% http://blogs.citrix.com/"7!/")/5/xenserver()((is(now(fully(open(source/

0. KVM. The %ernel'based virtual machine 1KVM2 is a +inux virtuali$ation subsystem.&s has been part of the mainline +inux %ernel since version .3.4, thus beingnatively supported by several distributions.

+in% http://www.linux(@vm.org/page/Aain_Bage

5eature /omparison of Virtual &nfrastructure Managers

*pen6ebula. *pen6ebula is one of the most feature'rich open'source V& managers. &t#as initially conceived to manage local virtual infrastructure, but has also includedremote interfaces that ma%e it viable to build public clouds.Altogether, four programmingA7&s are available8 XM+'97/ and libvirt for local interaction: a subset of !/ 1;uery2 A7&sand the *pen6ebula /loud A7& 1*/A2 for public access.s suite of tools aimed at transforming &Tinfrastructures into private clouds . &t distinguishes from other V& managers as one of themost feature'rich, due to the company>s several o?erings in all levels the architecture. &nthe v"phere architecture, servers run on the !"Xi platform. A separate server runsv/enter "erver, #hich centrali$es control over the entire virtual infrastructure. Throughthe v"phere /lient soft#are, administrators connect to v/enter "erver to perform varioustas%s. The

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such auto'scaling is dependent on the application developer using a limited subset of thenative A7&s on each platform, and in some instances you need to use specic oogle A7&ssuch as =9+5etch,