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Elastic Compute Service

Scheduled maintenance window

Scheduled maintenance window overview

Scheduled maintenance window is a flexible, automated O&M feature for ECS instances offered by VolcanoEngine. It is specifically designed for scheduled O&M events, allowing automatic handling of O&M events during your off-peak hours.

As a long-term rule configuration, this feature supports batch selection of resources by tag or project, flexible maintenance cycle configuration (daily or weekly), and automated authorization triggered by events. This enables unified management of O&M periods, effectively addressing issues such as delayed manual authorization, instance downtime, and inefficient configuration. This enhances ECS instance stability while minimizing the O&M impact on your business.

tip

This feature is in Beta. If you need a trial, submit a ticket or contact your account manager.

Without a scheduled maintenance window, when an event is generated and in the Inquiring state, you need to authorize VolcanoEngine to perform the O&M operation manually. For specific steps, refer to Querying and responding to "Instance redeployment due to system maintenance" events or Querying and responding to "Instance redeployment due to infrastructure upgrade" events.

Concepts

Concept	Description
O&M operation	The scheduled operation (such as instance redeployment) for the target event during the scheduled maintenance period.
Automatic authorization	By creating a scheduled maintenance window, you authorize VolcanoEngine to perform O&M operations for corresponding scheduled O&M events. After configuration, manual authorization is no longer required when an event is triggered.

How a scheduled maintenance window works

Event generated before the scheduled window cycle starts

If an event is generated before the start time of the scheduled maintenance window, the system defers instance redeployment until the scheduled window cycle starts. The cycle can be configured as "Weekly" or "Daily". The logic is consistent across both options. We use "Weekly" as an example below:

For example, if an event is generated on Monday, and the scheduled maintenance window cycle is from Friday 00:00 to Saturday 02:00, VolcanoEngine will perform the O&M operation (instance redeployment) for that event between Friday 00:00 and Saturday 02:00.

Event generated within the scheduled window cycle

If an event is generated within the current window cycle, the O&M operation (instance redeployment) will be executed within the current window. For example, if an event is generated between 00:00 and 01:30, the operation will be performed during that day's maintenance period of 00:00-01:30.

Maintenance action and O&M event of a scheduled maintenance window

For maintenance action and O&M event details of a scheduled maintenance window, see Scheduled O&M events.

Last updated: 2026.02.05 14:45:08