Developing Multi-tenant Applications for the Cloud on Windows Azure, 3rd Edition by Microsoft patterns & practices

Author:Microsoft patterns & practices [Microsoft patterns & practices]
Language: eng
Format: epub
Tags: COMPUTERS / Programming / Microsoft Programming
Publisher: Microsoft Developer Guidance
Published: 2012-12-05T16:00:00+00:00

In general, Windows Azure enables you to mitigate these risks by using multiple instances of resources. For example, you can run multiple instances of any web or worker role. Windows Azure will detect any failed role instances and route requests to other, functioning instances. Windows Azure will also attempt to restart failed instances.

However, running multiple instances of a role does impose some restrictions on your design. For example, because the Windows Azure load balancer can forward requests to any instance of a web role, either the role must be stateless or you must have a mechanism to share state across instances.

In the case of Windows Azure storage accounts, which contain blobs, tables, and queues, Windows Azure maintains multiple redundant copies. By default, Windows Azure uses geo-replication to make a copy of your data in another data center in addition to the multiple copies held in the data center that hosts your storage account.

Note:

For more information about how Windows Azure protects your data, see the blog post Introducing Geo-replication for Windows Azure Storage.

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