What is the Fault tolerance, recovery, availability SLA for WCF relays created via Azure Relays service

Shagil IMAM 0

What is the fault tolerance mechanism, recovery method, availability, and/or SLA for WCF relays created via Azure Relays service? I cannot find any documentation around this.

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Khadeer Ali 1,130 Reputation points Microsoft Vendor

2024-11-04T01:08:56.2766667+00:00

Hi Shagil IMAM,

Azure Relays doesn't explicitly provide detailed documentation on the specific fault tolerance mechanisms, recovery methods, and SLAs for WCF Relays

For WCF relays created via Azure Relay, the service offers an SLA of 99.9% availability, meaning that properly configured applications should be able to establish a connection to a deployed relay 99.9% of the time. This SLA is consistent across Azure's Service Bus Relays, which includes both WCF relays and Hybrid Connections.

In terms of fault tolerance and recovery, Azure Relays rely on the broader fault-tolerance mechanisms inherent in Azure's infrastructure. If a relay connection drops, applications can generally reconnect automatically if they are configured to handle transient faults using retry policies, a best practice for Azure services. However, the service does not offer built-in redundancy or failover within a relay itself. Instead, you would need to architect the application to handle connectivity interruptions, especially for critical applications.

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Shagil IMAM 0 Reputation points

2024-11-04T04:31:52.5333333+00:00

Thanks Khadeer. I too could not find any documentation regarding Azure Relay fault tolerance or recoverability, hence, posted question here.

Can you please share the references for the SLA of 99.9% mentioned in your response? Is it specifically mentioned somewhere that this is the SLA for "Azure Relays", or is it deduced based on the fact that Azure Relays are renamed versions of Azure Service Bus Relays?

Khadeer Ali 1,130 Reputation points Microsoft Vendor

2024-11-04T04:50:04.4466667+00:00

Hi Shagil IMAM,

Please check the below link for the reference:

https://www.microsoft.com/licensing/docs/view/Service-Level-Agreements-SLA-for-Online-Services?lang=1

While the specific documentation for Azure Relay may not explicitly restate the SLA separately from Service Bus, it is considered a renaming of Azure Service Bus Relays, which further supports the continuity of the SLA across these services. This can be inferred from the operational similarities and underlying architecture

Khadeer Ali 1,130 Reputation points Microsoft Vendor

2024-11-05T01:04:12.5566667+00:00

Hi Shagil IMAM,
Just checking in to see if the below answer helped. If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.

Khadeer Ali 1,130 Reputation points Microsoft Vendor

2024-11-06T04:20:42.3666667+00:00

Hi Shagil IMAM,
Following up to see if the above answer was helpful. If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.

Shagil IMAM 0 Reputation points

2024-11-06T04:32:13.8266667+00:00

Hello, unfortunately, this does not solve my problem, as I am looking for a concrete reference to support the SLA for Azure Relay. And also information on fault tolerance. Microsoft documentation does not explicitly address any of this in their documentation, and i cannot simply go with deduction that Azure Relay is renamed from Azure Service Bus Relay and therefor, same SLA must apply. I think Microsoft needs to update their documentation and address this gap.
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