Hi Vick
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- VMs configured on ESXi 5.5 U2 with 8GB RAM-->1 vCPU (per VM), for eg: if total 16 vCPUs has been utilized by the VMs, will it be possible to configure anymore VMs or do we need to add more physical and then configure vCPUs for VMs, I have one client running ESXi hosts with 16 physical CPUs but the total vCPUs configured is 17 and it is running fine until now, Just wondering vCPUs allocation of the VMs depends on the physical CPUs of the ESXi hosts then how it would be able to allocate more vCPUS, kindly advise on this and moreover whether this can be followed as a best practice. (vCPUs allocation is static right or is that any option for dynamic vCPU allocation?)
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I assume your questions as , you have 16PCPU esx and you want to power on more than 16 VM's and each VM has 1 vCPU. If that is the question, then you can have definitely more than 16VM's. As per max guide, you can have upto 512 VMs in 5.5 . But note that, this number is based certain assumption and the practically meaningful number could be much less. But definitely far more than 16.
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- One more more query regarding core allocation, our sales person somehow told me that vCPUs for VMs can be allocated as quarter core or even half core so we could able to have more cores in a blade regardless of increasing the physical CPUs on the blade, as far as my understanding there is no such option available in both VMware vSphere or in VMware vCloud Automation center (VCAC), if in case there is any option available to configure kindly instruct on this.
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Just like physical machine, the vm process are scheduled on per core. The process cannot be scheduled on quarter core or half core. I believe the sales person is trying to explain something different ( may be about features like HT ).
I would recommend you to read some technical resources in vmware.com ( such as https://www.vmware.com/files/pdf/techpaper/VMware-vSphere-CPU-Sched-Perf.pdf)