Geographically Distributed High Availability

This is the last post in the series on business continuity. It briefly describes how the service developer can provide geographically distributed high availability on the Azure platform. The Azure platform currently does not directly support highly available, geographically distributed services. Customers can deploy services to multiple data centers, but the platform does nothing to…


Disaster Recovery

While the Azure platform provides high availability within a single data center, as discussed in the previous post, it currently does not explicitly support or enable disaster recovery or geographically distributed high availability. This post and the next one will discuss how the service developer can provide these two capabilities, respectively. Disaster Recovery Disaster recovery typically…


High Availability On The Azure Platform

Currently, both Windows Azure and SQL Azure offer high availability within a single data center. As long as a data center remains operational and accessible from the Internet, services hosted there can achieve high availability. Windows Azure Windows Azure uses a combination of resource management, elasticity, load balancing, and partitioning to enable high availability within…


Business Continuity Basics

This post describes the basics of business continuity. Business continuity poses both business and technical challenges. In this series, we focus on the technical challenges, which include failure detection, response, diagnosis, and defect correction. Since failure diagnosis and defect correction are difficult to automate effectively in the platform, however, we narrow the focus even further…


Business Continuity On Azure

Azure customers want their services to be continuously available to their users, despite component failures, platform degradations and data center outages. In other words, they want business continuity. To achieve it, the services must be highly available, and must recover from outages quickly and with minimal data loss, while complying with policies and regulations, and…


Remembering Steve by Remembering NeXT

Last week, JJ Dubray asked me to write something about NeXT in Steve’s honor for InfoQ. It’s part of a post about Steve with thoughts from several people, including Eric Schmidt and Tim Berners-Lee. My thoughts are near the bottom of the post.


FabrikamJets Example Updated (Really)

I just discovered that the 2.0 release of the Fabrikam Jets example on code gallery (described in this blog post) contained the original version 1.0 code that worked with OAuth WRAP v0.8, instead of the new version 2.0 code that works with OAuth WRAP v0.9. Apparently, I uploaded the wrong file back in January. The…


Silverlight Samples for OData Over SQL Azure

I’ve just published a some code samples that show how to build a Silverlight client for the OData Service for SQL Azure, and how to build a service that validates Secure Web Tokens (SWTs) issued by AppFabric Access Control. For more information about the client, see my earlier post about Silverlight Clients and AppFabric Access…


Silverlight Clients and AppFabric Access Control

As described in my previous post, I’ve just finished building some Silverlight clients and a portal for the new OData service for SQL Azure using AppFabric Access Control (ACS). In the process, I ran into a few issues worth documenting. Hello, World! Before we get to harder problems, let’s make sure we have the basics…


How to Use OData for SQL Azure with AppFabric Access Control

[Created – April 16, 2010] [Updated – October 5, 2010 – Revised text and URIs to refer to ACS production, since ACS Labs is now running ACS v2.] Looking for a way to expose data in SQL Azure to web clients using simple REST based APIs? If so, life just got easier. Over the last few weeks, I’ve…