Hi Maxim, CPU overcommitment can be set up with the CPU / VCPU attributes. Let's say you have an 8-core host, and you want to run a max. of 16 VMs, each with 2 virtual CPUs:
CPU = 0.5 VCPU = 2 Unfortunately, OpenNebula doesn't have any equivalent for memory overcommitment. Maybe we should add a new attribute, VMEMORY, and use the same idea as with VCPU: MEMORY: requested host memory VMEMORY: amount of memory that the VM guest will see We'd like to hear your thoughts. Would that be enough for your use-case, or do you have any other suggestion to manage ballooning? And now, how to force the memory overcommitment: You can edit the host monitoring script to report the double of the real memory. Multiply by 2 $total_memory in /var/lib/one/remotes/im/kvm.d/kvm.rb Then execute 'onehost sync' as oneadmin in the front-end. OpenNebula will update the poll script in the next host monitorization cycle. Cheers -- Carlos Martín, MSc Project Engineer OpenNebula - The Open Source Toolkit for Data Center Virtualization www.OpenNebula.org | cmar...@opennebula.org | @OpenNebula<http://twitter.com/opennebula><cmar...@opennebula.org> On Tue, Feb 7, 2012 at 4:25 AM, Maxim Mikheev <mik...@gmail.com> wrote: > Hi Steven, > > Thank you for your answer. Unfortunately for me it has some checks > (OpenNebula 3.2.1). > Parameters of a host: > USEDCPU 230.4 > CPUSPEED 1400 > NETTX 168512869 > HYPERVISOR kvm > TOTALCPU 6400 > ARCH x86_64 > NETRX 4634446500 > *FREEMEMORY 164233748* > *FREECPU 6169.6* > TOTALMEMORY 264610312 > MODELNAMEAMD Opteron(TM) Processor 6272 > USEDMEMORY 100376564 > HOSTNAME s0 > > The system has running 4 VM's with total allocation 64 CPUs. and VM > template with CPU=4 and MEMORY=5000 never started (in the Pending state). > When I turn of any of other running VM's this VM's immediately start. > > I have seen some old e-mails (2010-2011) which are requested such > behavior and it was implemented. But I didn't find how to adjust it. I > would like to turn this feature off or to make to possible make 2x (or > others) overcommitment. > Can anyone suggest how to change rules? > > Regards, > Max > > On 02/06/2012 09:55 PM, Steven C Timm wrote: > > Hi Max-- > We are using OpenNebula 2.0 here which does not have any protection on either > cpu or memory over-commit. > When you are running OpenNebula with KVM, at least with opennebula 2.0, it > counts not the total amount of memory that the user requested but the amount > currently being used by the VM, which is usually less. I don't have direct > experience with opennebula 3.2 but the same > must be possible there. > > -----Original Message----- > From: users-boun...@lists.opennebula.org > [mailto:users-boun...@lists.opennebula.org > <users-boun...@lists.opennebula.org>] On Behalf Of Maxim Mikheev > Sent: Monday, February 06, 2012 7:59 PM > To: users@lists.opennebula.org > > Subject: [one-users] OpenNebula 3.2 need memory and CPU over-commit. > > Hi Everyone, > > We are using Open Nebula on Ubuntu 11.10. Our VM's usually never use a whole > system in the same time. But when they are active they usually require huge > amount of computational power. > > OpenNebula has a protection from Overcommitment of memory and CPU. I have a > question: How can I manually setup Overcommitment by factor 2 for CPU and > Memory? > Significant amount of memory is helpful for our calculations but all this > extra memory is a caches. It means that nothing will be happen if Cache size > will be decreased for the VM. The cache can be dynamically scale down by > balloon driver which is a default for Libvirt and KVM in Ubuntu. > It means that I absolutely sure that would like to over-commit memory. > There are no problem for a processor too. Our calculations took usually > several days and one day extra for one VM does not change anything. > I already used these scheme with over-commitment on Proxmox and it works well. > > Regards, > Max > _______________________________________________ > Users mailing > listUsers@lists.opennebula.orghttp://lists.opennebula.org/listinfo.cgi/users-opennebula.org > > > _______________________________________________ > Users mailing list > Users@lists.opennebula.org > http://lists.opennebula.org/listinfo.cgi/users-opennebula.org > >
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