«Compute hosts» tab

Tab displays list of compute hosts and their load in the context of resources:

../../../../../_images/admin_balancing_compute_hosts.png

Compute hosts list

This list displays only those hosts that meet the following conditions:

  • the host is computational;
  • the host is active;
  • balancing is allowed for the host aggregate.
List contains the following information about compute hosts:
Field name Description
Hostname Name of the hypervisor. It is set when it is added. It is also a link to go to detailed information about this hypervisor. Number at the end of the name indicates the number of instances located on the host.
Host title Title of the hypervisor. It is changed in the general list.
Host Aggregates Name of compute host aggregate.
Reserved

Flag indicating that host belongs to the reserve list. Possible values are:

  • Yes, host is off and it belongs to reserve list;
  • No, host doesn’t belong to reserve list.
RAM Percentage of load on the RAM of the compute host.
vCPU Percentage of load on the processor of the compute host.
Disk Percentage of load on the disk space of the compute host.

Sorting and filtering tools are available for the list of compute hosts. Filtration is performed according to the following parameters:

  • Hostname;
  • Host title;
  • Type;
  • Host aggregates;
  • Reserved.
Group action available for compute hosts:
N Action Description
1 Automatic balancing Automatic distribution of instances between selected compute hosts in order to optimize the use of RAM. Moving instances from one compute host to another is done by migration.

Also on the page you can see list of instances located on the host, for this use the drop-down list:

../../../../../_images/admin_balancing_compute_hosts_instance_list.png

List of instances on the host

Each field has sorting tool. By default, the list of instances is sorted by the amount of RAM.

Available actions:
N Action Description
1 Balance Live migration of instance to the optimal host.

Features of working

Automatic balancing

Important

Automatic balancing is performed only if the value of the parameter enabled is True in the section balancing of the configuration file CloudManager. Balancing is performed only for host located in the same Availability Zone.

Important

Action is available only for hosts that are not included in the nova availability zone, and for which aggregates where balancing is allowed: there is metadata allow_balancing =True.

Select required compute hosts and start group action «Automatic balancing»:

../../../../../_images/admin_balancing_compute_hosts_autobalancing.png

Selecting hypervisors

Confirm automatic balancing of selected hosts:

../../../../../_images/admin_balancing_compute_hosts_autobalancing_confirm.png

Automatic balancing confirmation window

Balancing instances

Note

Balancing is available only for instances with the status «Active».

Function is available in the dropdown list of the compute host:

../../../../../_images/admin_balancing_host_aggregates_balance_instance.png

List of instances

Select the required instance and balance they. During the balancing process, the instance will be moved to the optimal host.