Hi, On Fri, Feb 21, 2014 at 3:30 PM, kiran ranjane <kiran.ranj...@gmail.com>wrote:
> Hi Carlos, > > Thanks for the explanation, Few more question on this : > > How many vCPU a core can manage? > What is the maximum vCPU that can be allocated to a VM? > > Thanks > Kiran Ranjane > There isn't a limit enforced by OpenNebula. The limit depends on the underlying hypervisor. Regards -- Carlos Martín, MSc Project Engineer OpenNebula - Flexible Enterprise Cloud Made Simple www.OpenNebula.org <http://www.opennebula.org/> | cmar...@opennebula.org | @OpenNebula <http://twitter.com/opennebula> <cmar...@opennebula.org> > > On Thu, Feb 20, 2014 at 9:32 PM, Carlos Martín Sánchez < > cmar...@opennebula.org> wrote: > >> Hi, >> >> On Mon, Feb 17, 2014 at 4:29 PM, kiran ranjane <kiran.ranj...@gmail.com> >> wrote: >> >> Hi Everyone, >>> >>> I have few questions with regards to cpu and vcpu while creating >>> templates in Sunstone : >>> >>> 1) What is the difference between cpu and vcpu according to opennebula >>> architecture? >>> >> >> CPU refers to the physical Host cpu cores, the one you see in the >> "allocated cpu" column. >> vCPU is simply the number of cpus that the VM guest will see, but it does >> not affect the physical resources assigned to the VM. >> >> 2) How do we calculate vCPU, For example if I have 1 processor with 8 >>> core then how much vCPU can I allocate. >>> >> >> They are not related. But the scheduler will not deploy more VMs when the >> sum of the running VM CPU reaches 8. >> >> >>> 3) How can I manage cpu capacity (recommendation) in a better way so >>> that I can utilize it in optimum way. >>> >> 4) Any calculation on CPU or formula that we need to use before assigning >>> it to Virtual machine, For example if I use 1 CPU in the virtual machine it >>> uses 1 core of the processor? is this correct. >>> 5) What is the use of vCPU, If I have allocated 1 CPU and 2 vCPU to the >>> virtual machine thus that mean it will use 1 core of the physical and >>> inside the VM it will show 2 cpu assigned to it? >>> >> >> The purpose of vCPU is to allow cpu overcommitment. For example, for a >> host with 8 cores, you could create 4 VMs with >> cpu=2, vcpu=2 >> >> But if your VMs workload is not very cpu-intensive, you could decide to >> launch 16 VMs >> cpu=0.5, vcpu=2 >> >> >> To ensure that the VMs are not using more CPU than the amount assigned, >> you may need to configure your hypervisor. For example, in kvm you need to >> configure cgroups [1] >> >> Regards >> >> [1] >> http://docs.opennebula.org/stable/administration/virtualization/kvmg.html#working-with-cgroups-optional >> -- >> Carlos Martín, MSc >> Project Engineer >> OpenNebula - Flexible Enterprise Cloud Made Simple >> www.OpenNebula.org | cmar...@opennebula.org | >> @OpenNebula<http://twitter.com/opennebula> >> > >
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