Host standby mode

Starting PowerVC 2.2.0, you can now move a host to standby mode. A Standby host is also referred to as a reserve-on-purpose host.

Before placing a host in standby mode, these conditions must be met.
  • The host's hypervisor must be in an “operating” state.
  • No virtual machine (VM) must be present in the host.
  • If soft pinned VMs are associated with the host, that host cannot be placed into a standby mode.
When the host is in standby mode, these operations are restricted.
  • New provisioning of VM is not possible.
  • VMs cannot be imported.
  • All mobility operations in the standby host are blocked.
Administrators can perform these tasks.
  • Unset the standby host to ‘Available’.
  • Define the standby mode during the registration of the new host.
  • Define any number of hosts as standby hosts and these hosts will not be considered as viable hosts for any policy set at the host group level, for example, Packing, Striping, CPU or Memory balance, and so on.

Host standby mode options

Table 1. Host standby mode API options
Method URI Description



Enables or disables the host maintenance mode for the respective hypervisor hostname.

Response Codes
  • Normal Response Code: 200
  • Error Response Codes:
    • Bad Request (400)
    • Not Found (404)

Request Body:

Table 2. Host standby mode API request body parameters
Name In Type Description




Required: Enable or disable standby mode. Values are enable or disable.