Virtualization market leader VMware today got a key bit of good news for \n\nits largest enterprise customers: ERP giant SAP announced it will support its \n\nproducts running in 64-bit Windows- and Linux-based production-level virtual machines based on VMware's ESX Server \n\nsoftware.More on Virtualization\nFuture Threats to VM Security: Fact vs. Fiction\n\nCitrix Seals XenSource Deal, Pressures VMWare\n\nTaking Virtual Servers Beyond Data Center Consolidation\n\nHow Server Virtualization Tools Can Balance Data Center Loads\n\nHow To Do Virtualization Right\n\nUntil now, CIOs who wanted to run SAP apps on such a VM, or virtual machine, could do so of course, but wouldn't get help \n\nfrom SAP if they ran into technical trouble.\n\nERP applications, often the most critical software in large enterprises, remain something of an emerging frontier for \n\nvirtualization. While many CIOs are running a wide variety of applications on VMs now, the thought of putting the ERP \n\napplications on a VM still gives many CIOs pause. Since ERP apps are the most critical to business-side users, any slowdown \n\nin application performance would be a huge black eye for IT. And the art and science of balancing workloads on one physical \n\nserver hosting multiple VMs, to avoid any such slowdowns, is young yet.\n\nAlso, because ERP and database applications are some of the most resource-hungry apps, it doesn't always make sense to run \n\nthem on a VM, as they may just consume the I\/O resources of the physical server to the point that another VM wouldnt be able \n\nto share that physical server effectively. \n\nStill, ERP deployments are highly customized and vary from one enterprise to another, and some CIOs are already choosing to \n\nrun ERP apps on a VM, notes James Staten, a principal analyst at Forrester Research. "You may want to put these apps on top \n\nof virtualization in order to take advantage of fast restart in a disaster recovery scenario, or for the non-disruptive \n\nupgrade [of the application itself], or in a test\/development environment where you want fast set up and tear down," he \n\nsays.\n\nVMware also announced today that servers from Dell, Fujitsu-Siemens, HP and IBM have been hardware-certified for SAP \n\nsolutions running on Windows and Linux with VMware ESX Server. This is a statement that VMware's rival, Citrix\/Xen, cannot \n\nmake yet.\n\nSAP's main rival, Oracle, has come under fire recently for its comments \n\nregarding customer support for Oracle products running on VMs. Oracle has declined to \n\nprovide official support for its products running on VMware-based production environment VMs. \n\nOracle is trying to make its own move against VMware and Citrix\/Xen in the virtualization software market, as the company \n\nannounced at its recent Oracle OpenWorld tradeshow. Oracle's plans to create its own Xen-based hypervisor, dubbed Oracle VM, \n\ngot a cool reception from industry analysts at that tradeshow.\n\nBy offering full support for Oracle products running on Oracle VM, and not VMware products, Oracle will try to chip away at \n\nVMware's enterprise market share, says Burton Group research analyst Chris Wolf. Oracle also will try to cook up pricing \n\nadvantages for their customers, Wolf notes. (Oracle also supports x86 virtualization on Sun Solaris Containers.)\n\n"Oracle has historically supported large enterprises using VMware on a case-by-case basis," Wolf notes. "Several Burton Group \n\nclients run Oracle inside VMware VMs, and have been doing so for nearly a year. Of course, public official support for VMware \n\nESX VMs would be a step in the right direction," he says.\n\nPricing of enterprise software is becoming a confusing and sometimes contentious issue in an environment that's running on \n\nVMs. Should the software be licensed by number of CPUs, number of VMs, or number of end users? \n\nPolicies vary by vendor; customers negotiate individual licensing agreements. For instance, some CIOs have licensing \n\nagreements for software such as BEA's Web Logic application server that's based on a number of CPUs, not a number of VMs \n\nrunning on those CPUs; this means the CIO can run as many VMs as he likes on that set number of CPUs. A CIO with this \n\narrangement is loathe to see it change if he's making good utilization of his virtualized environment.\n\nSAP has stepped ahead of some other ISVs in sorting out the pricing and licensing issues that are popping up in virtualized \n\nenvironments, notes the Burton Group's Wolf. "SAP is actually a model vendor for enterprise ISVs to follow," says Wolf. \n\n"Their licensing is purely based on the number of end users. SAP understands that binding licensing to physical resources is \n\ncounterproductive, since a major aspect of server virtualization is abstraction of underlying hardware resources," he \n\nsays.