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TFS 2018 and SQL Server 2017–Multidimensional server mode

Last week I did a test migration for a customer from TFS 2015 to TFS 2018. They already configured a SQL Server 2017 Database Services, Analysis Services and Reporting Services for me, so I thought I was good to go.

However halfway through the migration process I noticed the following warning appear:

[2017-11-15 14:18:43Z][Warning] An error was encountered while attempting to upgrade either the warehouse databases or the Analysis Services database. Reporting features will not be usable until the warehouse and Analysis Services database are successfully configured. Use the Team Foundation Server Administration console to update the Reporting configuration. Error details: TF400646: Team Foundation Server requires Analysis Services instance installed in the 'Multidimensional' server mode. The Analysis Services instance you supplied (<INSTANCE NAME>) is in 'Tabular' server mode. You can either install another instance of Analysis Services and supply that instance name, or you can uninstall this instance and install it in the required server mode.

Turns out that in SQL Server 2017 Analysis Services you can choose between 3 possible modes:

Relational modeling constructs (model, tables, columns), articulated in tabular metadata object definitions in Tabular Model Scripting Language (TMSL) and Tabular Object Model (TOM) code. This is the default value. OLAP modeling constructs (cubes, dimensions, measures). Originally an add-in, but now fully integrated into Excel. Visual modeling only, over an internal Tabular infrastructure. You can import a Power Pivot model into SSDT to create a new Tabular model that runs on an Analysis Services instance.

Value

Description
TABULAR Relational modeling constructs (model, tables, columns), articulated in tabular metadata object definitions in Tabular Model Scripting Language (TMSL) and Tabular Object Model (TOM) code.
MULTIDIMENSIONAL OLAP modeling constructs (cubes, dimensions, measures).
POWERPIVOT Originally an add-in, but now fully integrated into Excel. Visual modeling only, over an internal Tabular infrastructure. You can import a Power Pivot model into SSDT to create a new Tabular model that runs on an Analysis Services instance.

More information: https://docs.microsoft.com/en-us/sql/analysis-services/comparing-tabular-and-multidimensional-solutions-ssas

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