Frequent question: What is host pinning?

What is a pinned VM?

Updated on 05/31/2019. This fault occurs when DRS cannot move a virtual machine because DRS is disabled on it. That is, the virtual machine is “pinned” on its registered host.

How do I pin a VM to host?

Procedure

  1. Browse to the cluster in the vSphere Client.
  2. Click the Configure tab.
  3. Under Configuration, click VM/Host Rules.
  4. Click Add.
  5. In the Create VM/Host Rule dialog box, type a name for the rule.
  6. From the Type drop down menu, select Virtual Machines to Hosts.

Why do we need CPU pinning?

Processor affinity, or CPU pinning or “cache affinity”, enables the binding and unbinding of a process or a thread to a central processing unit (CPU) or a range of CPUs, so that the process or thread will execute only on the designated CPU or CPUs rather than any CPU.

What is the reason for VM pinning?

2 Answers. CPU pinning ensures a VM will only get CPU time from a specific CPU or set of CPUs. Unless you have a very specific reason to pin, there usually is no need to do that.

What is host affinity?

The VM-Host affinity rule allows you to control which hosts in the cluster can run which VMs and requires that at least one VM DRS group and at least one host DRS group are created before managing host affinity rules.

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What are the 3 affinity rules?

Three types of rules are available:

  • affinity rules – DRS will try to keep certain VMs together on the same host. …
  • anti-affinity rules – DRS will try to keep certain VMs are not on the same host. …
  • VM to host rules – specify whether VMs can or can’t be run on a host.

What is NUMA and CPU pinning?

The NUMA topology and CPU pinning features in OpenStack provide high-level control over how instances run on hypervisor CPUs and the topology of virtual CPUs available to instances. These features help minimize latency and maximize performance.