Host maintenance for Amazon EC2 Dedicated Host
With host maintenance, your Amazon EC2 instances on the degraded Dedicated Host are automatically rebooted on a replacement Dedicated Host during a scheduled maintenance event. This helps reduce application downtime and offloads the undifferentiated heavy-lift of maintenance to Amazon. Host maintenance is also performed for planned and routine Amazon EC2 maintenance.
Host maintenance is supported on all new Dedicated Host allocations made through Amazon EC2 console. For any Dedicated Host in your Amazon Web Services account or any new Dedicated Host allocated through AllocateHosts API, you can configure host maintenance for supported Dedicated Hosts. For more information, see Configure the host maintenance setting for an Amazon EC2 Dedicated Host.
Contents
Host maintenance versus host recovery
The following table shows the main differences between host recovery and host maintenance.
| Host recovery | Host maintenance | |
|---|---|---|
| Accessibility | Unreachable | Reachable |
| State | under-assessment |
permanent-failure |
| Action | Recovery is immediate | Maintenance is scheduled |
| Scheduling flexibility | Cannot be rescheduled | Can be rescheduled |
| Host Resource Group | Supported | Not supported |
For more information about host recovery, see Host recovery.
Supported instance types
Host maintenance is supported for the following instance families:
-
General purpose:
A1|M4|M5|M5a|M5n|M5zn|M6a|M6g|M6i|M6in|M7a|M7g|M7i|T3 -
Compute optimized:
C4|C5|C5a|C5n|C6a|C6g|C6gn|C6i|C6in|C7g|C7gn|C7i -
Memory optimized:
R4|R5|R5a|R5b|R5n|R6a|R6g|R6i|R6in|R7a|R7g|R7iz|u-12tb1|u-18tb1|u-24tb1|u-3tb1|u-6tb1|u-9tb1|X2iezn -
Accelerated computing:
G3|G5g|Inf1|P2|P3
Limitations
-
Host maintenance is not supported in Amazon Outposts, Amazon Local Zones, and Amazon Wavelength Zones.
-
Host maintenance cannot be turned on or off for hosts already within a host resource group. Hosts added to a host resource group retain their host maintenance setting. For more information, see Host resource groups.
-
Host maintenance is only supported on specific instance types. For more information, see Supported instance types.
Related services
Dedicated Host integrates with Amazon License Manager—Tracks licenses across your Amazon EC2 Dedicated Hosts (supported only in Regions in which Amazon License Manager is available). For more information, see the Amazon License Manager User Guide.
You must have sufficient licenses in your Amazon Web Services account for your new Dedicated Host. The licenses associated with your degraded host are released when the host is released after the completion of the scheduled maintenance event.
Pricing
There are no additional charges for using host maintenance, but the usual Dedicated Host
charges apply. For more information, see Amazon EC2 Dedicated Hosts
Pricing
As soon as host maintenance is initiated, you are no longer billed for the
degraded Dedicated Host. Billing for the replacement Dedicated Host begins only after it
enters the available state.
If the degraded Dedicated Host was billed using the On-Demand rate, the replacement Dedicated Host is also billed using the On-Demand rate. If the degraded Dedicated Host had an active Dedicated Host Reservation, it is transferred to the new Dedicated Host.