Microsoft recently announced “Windows Azure Traffic Manager,” saying it will allow “deployment of the same application to topologically dispersed data centers enabling the distribution of workload between these data centers through round robin, failover and performance based load balancing schemes.” Azure Traffic Manager is available only in a community technology preview, meaning it’s not ready for all customers. While Windows Azure Traffic Manager distributes traffic across multiple data centers, SQL Azure Data Sync, also in beta, replicates "databases across multiple data centers to prevent against a DC getting lost," according to Microsoft.
Google’s App Engine service can shift both applications and data from one data center to another without data loss or downtime in the event of failure, said Google product manager Greg D'alesandre. Google would not say how far apart the data centers are, but said "the system is designed so that there is no single geographic point of failure."
Amazon, meanwhile, has been accused of not providing a full explanation of what actually went wrong last week. Amazon blamed a "networking event" that "triggered a large amount of re-mirroring" of storage volume, creating a capacity shortage, and lost connections to virtual machines.
Thorsten von Eicken, CTO and founder of RightScale, which provides services that enhance the functionality of Amazon EC2, said Amazon "earns an F" for communication and has failed to offer a root-cause analysis.
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