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Placement Groups

You can add a cloud server to a placement group. Servers in a group can be located on different physical hosts, which increases infrastructure fault tolerance.

A placement group is created for a specific pool. At the same time, cloud servers in the group can be located in different segments within the pool.

You can work with placement groups in the control panel, using the OpenStack CLI or Terraform.

Placement policy

When creating a group, you can select a group policy — it determines how servers will be placed on physical hardware:

  • preferably on different hosts (soft-anti-affinity) — the system will strive to place servers on different hosts. If there is no suitable host available when creating a server, it will be created on the same host;
  • strictly on different hosts (anti-affinity) — servers in a group are always located on different hosts. If we do not find a suitable host, the server will not be created.

Restrictions

A group can only be created for one pool.

In one project, you can create up to 100 placement groups.

A single group can contain no more than 15 cloud servers at a time.

You can add a cloud server to a placement group only when creating a cloud server.

Pricing

Creating a placement group is free of charge.

Only cloud servers in the group and other Cloud Platform resources are billed according to the Cloud Platform payment model.