Migrating an Enterprise Microsoft Product (TFS) on to Windows Azure Sriram Dhanasekaran SDE II, Microsoft

Agenda Microsoft Visual Studio Team Foundation Server 2010 – Architecture Migration – steps and challenges Lessons –What aspects made the migration easier? Demo Q&A

MICROSOFT VISUAL STUDIO TEAM FOUNDATION SERVER 2010

TFS Architecture

TFS on Azure Windows Azure Web Role SQL Azure Worker Role VM/Worker Role* * Not in current release

MIGRATION

SQL Server => SQL Azure No OPENXML –Moved to using TVP instead. No ‘SELECT INTO’ No SysMessages –Developed own mechanism Mandatory Clustered Indexes No full text index

Identities No Windows Identities in Azure. Need to use internet identity system. Use App Fabric Access Control Services as federation system –Open ID compatible –Multiple providers – Live, Yahoo, Google, Facebook –Supports Active Directory Federation –Provides service identities for various co-operative services to authenticate each other. Clients now need to prompt a web page to accept credentials

Storage In On-premise version, all data was stored in SQL Server – work item attachments, source code files, test attachments Disadvantages of SQL Azure –Cap on size of database –About x50 expensive Moved all blob data to Windows Azure Blob Storage. –Cheap –Scalable

Communication Protocol Made all components behave like pure clients –Having no peer-peer relationship enables simple trust relationship –Allows easy support for multiple topologies

Security Centralized authentication and authorization system –Server handles all security aspects –Enables simpler trust relationships –Data hidden

Tuning for WAN access TFS always on WAN –Think hard on hitting the server –Calls to server needs to be Async and cancellable –Minimize round trip, payload etc., Streaming data Offline cache Compression

Running as a service COGS –Storage –Bandwidth Upgrade –No downtime –Upgradeable at a tenant level –Client upgrades Diagnostics Operations team becomes an integral part of product team Billing

LESSONS LEARNT

What makes migration simpler? Web friendly protocols –ASP.NET web services –WCF Stateless services 3-tier application model. Support for scaling any tier independently. Multi-tenant notion –Unit of operation –Delegation of administration

DEMO TFS on Azure

Q & A

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