Is an image version replicated to a secondary region, available in the secondary region, if the region of the Shared Image Gallery is down?

Question

With a Shared Image Gallery provisioned in region "X" containing an image version replicated to both region "X" and region "Y", will this image version be available in region Y if region X is down? I'm looking into this for BCDR scenarios, where I guess that the alternative would be have a shared image gallery in each regions and doing the replication ourselves?

And in addition to this, I do not see any SLAs for Shared Image Gallery anywhere? If I provision a Shared Image Gallery with a single image version based on a VHD in a blob storage, should I assume that the SLA is identical that blob storage? What about the case replicated image versions?

Answer 1

@shm-0861 Thank you for your question.

Given a shared image that was created in region "X" (source region) and replicated to region "Y" (target region), image availability in not affected by an outage in another region. Obviously this applies only if the replication copy operation has already completed.

The Shared Image Gallery is a free service which operates as a coordination layer above your Azure Storage account. The billing impact of using the service is limited to the storage costs and data transfer fees associated with your replicated images. If you are concerned about image availability, ensure you use zone-redundant storage for your images.

Typically there are no SLAs for free services on Azure (there would be no billing impact in the event of unavailability exceeding the downtime allowance).

Hope it helps.

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