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Clarify that all regions that support the service are paired
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articles/reliability/reliability-device-registry.md

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@@ -87,27 +87,25 @@ The Azure Device Registry platform manages traffic routing, failover, and failba
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Device Registry is a single-region service. If the region becomes unavailable, your Device Registry resources are also unavailable.
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However, if your resources are in a [region that's paired](./regions-paired.md), your registry's data is replicated to the paired region.
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In the event of a prolonged region outage, Microsoft might elect to fail over to the paired region. If this happens, your registry continues to be available in the paired region.
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However, your registry's data is replicated to the paired region. In the event of a prolonged region outage, Microsoft might elect to fail over to the paired region. If this happens, your registry continues to be available in the paired region.
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### Region support
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Default replication and failover is only supported in regions that are paired.
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Default replication and failover is supported in all regions that Device Registry is available in, because [all of these regions are paired](./regions-paired.md).
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### Cost
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For hubs in regions that are paired, there's no extra cost for cross-region data replication or failover.
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There's no extra cost for cross-region data replication or failover.
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### Configure replication and prepare for failover
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By default, cross-region data replication is automatically configured when you create Device Registry resources in a paired region. This process is a default option and requires no intervention from you.
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By default, cross-region data replication is automatically configured when you create Device Registry resources in a region with a pair. This process is a default option and requires no intervention from you.
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### Normal operations
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This section describes what to expect when a device regsitry is configured for cross-region replication and failover, and the primary region is operational.
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- **Data replication between regions:** Data is replicated automatically to the paired region. Replication occurs asynchronously, which means that some data loss is expected if a failover occurs. There's no data replication between regions for device registeries in nonpaired regions.
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- **Data replication between regions:** Data is replicated automatically to the paired region. Replication occurs asynchronously, which means that some data loss is expected if a failover occurs.
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- **Traffic routing between regions:** In normal operations, traffic only flows to the primary region.
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- **Active requests:** Any requests that the primary region is processing during a failover are likely to be lost. Clients should retry requests after failover completes.
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- **Expected data loss:** For regions that are paired, data is replicated asynchronously to the paired region. As a result, some data loss is expected after failover. You can expect less than 15 minutes of data loss following a region failover.
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- **Expected data loss:** Data is replicated asynchronously to the paired region. As a result, some data loss is expected after failover. You can expect less than 15 minutes of data loss following a region failover.
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- **Expected downtime:** Expect approximately 24 hours of downtime from when the region is lost to when the resource is available in the paired region.
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