Solusvm2
SolusVM Documentation

Enabling High Availability Globally

Overview

You must enable High Availability (HA) protection globally before any failover domain configuration takes effect. This page explains how to enable the feature and configure the grace period and the concurrent failure limit.

Note:

The account must have the MANAGE_HIGH_AVAILABILITY permission to access the Settings > High Availability interface. For more information, see User Access Control.

Enable High Availability

To enable HA protection globally, perform the following steps:

  1. Go to Settings > High Availability.

  2. Select the Enable High Availability for Compute Resources checkbox.

  3. Configure the following settings:

    • Grace period: The number of seconds a compute resource must remain unreachable before HA starts an evacuation.

    Note:

    • The default value is 300 seconds, and the minimum value is 140 seconds. HA needs at least 140 seconds to confirm that a compute resource is down.
    • Set a longer grace period if you want to give the compute resource more time to recover. For example, if you set the grace period to 160 seconds, HA starts an evacuation only if the compute resource remains unreachable for 160 seconds.
    • Maximum concurrent failures: The maximum number of compute resources that can fail at the same time in a single failover domain before the system stops automatic failover.

    Note:

    • The default value is 3, and the minimum value is 1.
    • If more compute resources than this fail at the same time, SolusVM treats the failover domain as the likely cause of the failures. In this case, the system stops failover for all compute resources in the domain until an administrator investigates the issue. Evacuation would not help in this case, because the virtual server disks use the same shared storage.

  4. Click Save.

Disable High Availability

To disable HA globally, perform the following steps:

  1. Go to Settings > High Availability.
  2. Deselect the Enable High Availability for Compute Resources checkbox.
  3. Click Save.

Disabling HA globally preserves all failover domains and plan configurations. The configurations take effect again when you re-enable HA. When you disable HA, the system shows a warning on the Failover Domains interface. The HA status of each compute resource also shows a warning. The warning includes a link to Settings > High Availability, where you can re-enable HA.

To disable HA for a single failover domain instead of the whole cluster, see Disable a Failover Domain.

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