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Measures reported by AlibabaRegZoneTest
A region is a geographic area where a data center resides. The region of an Alibaba Cloud resource cannot be changed after the resource is created. A zone is a physical area with independent power grids and networks in a region. Zones within the same region have access to each other, but faults
within a single zone will not affect the others. If your application requires high disaster recovery capabilities, you can choose a multi-zone deployment to create your instances in different zones of the same region. If your application requires low network latency, you can choose a single-zone deployment to create your RDS instances in the same zone.
To know the number, names, and status of regions and zones configured in the target Alibaba cloud deployment, use the AlibabaRegZoneTest test.
Outputs of the test : One set of results for the cloud account being monitored.
The measures made by this test are as follows:
| Measurement |
Description |
Measurement Unit |
Interpretation |
| Total_regions |
Indicates the total number of regions managed by the target cloud account. |
Number |
Use the detailed diagnosis of this measure to know the regions managed by the monitored cloud
account. |
| Total_zones |
Indicates the total number of zones in each region managed by the target cloud account. |
Number |
Use the detailed diagnosis of this measure to know the zones managed by the monitored cloud account and
which region each zone belongs to. |
| Available_zones |
Indicates the number of zones that are currently available. |
Number |
Use the detailed diagnosis of this measure to know the available zones and which region each such zone
belongs to. |
| Unavailable_zones |
Indicates the number of zones that are currently unavailable. |
Number |
If a zone is unavailable, then all instances operating within that zone will also be rendered unavailable. If you choose a single zone deployment, where all your instances are only in one zone, then the value 1 for this measure is a cause for concern. This is because, such a value implies that the zone hosting all ECS instances is now unavailable and hence inaccessible to cloud users.
To provide more reliable services, you can create Server Load Balancer (SLB) instances in a region with multiple zones. When the data center in the primary zone is faulty and unavailable, SLB is able to switch to the data center in the secondary zone to restore its service within 30 seconds. When the primary zone becomes available again, SLB will switch back to the primary zone. In a multi-zone deployment therefore, you should be concerned only if the value of this measure is the same as that of the Total zones measure.
To identify the unavailable zones and their regions, use the detailed diagnosis of this measure. |
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