MaxAvailabilityZones
The maximum number of Availability Zones that the Rack cluster should use. This controls how many AZs the Rack's subnets and resources are distributed across.
| Default value | 3 |
| Allowed values | 2, 3 |
Use Cases
- Setting to
2in AWS regions that only have two Availability Zones - Reducing to
2to lower cross-AZ data transfer costs in cost-sensitive environments - Updating this value when changing AvailabilityZones to match the new number of AZs specified
Additional Information
When updating the AvailabilityZones parameter to a different set of AZs, you must also set MaxAvailabilityZones to match the quantity of AZs you are selecting.
Using 3 Availability Zones (the default) provides better fault tolerance since your workloads are distributed across more isolated data centers. Only reduce to 2 when necessary due to region limitations or specific cost constraints.
$ convox rack params set MaxAvailabilityZones=2
See Also
