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When you are performing Team Foundation Server system servicing, such as installing a service pack or hotfix, the installer disables access to the Team Foundation Server for the duration of the servicing. This is called "quiescing" the server. After completion of the servicing, the server is reenabled, or "unquiesced".
This capability was introduced as an update to Team Foundation Server 2005. The update is available at http://support.microsoft.com/default.aspx?scid=kb;EN-US;919156
(http://support.microsoft.com/default.aspx?scid=kb;en-us;919156). No update is required for Team Foundation Server 2008, as this functionality is included.
The quiescing operation is done by a command line utility called TFSQuiesce.exe, which is located in the "<TFS home directory>\TF Setup" folder. By default, the TFS home directory is either "Microsoft Visual Studio 2008 Team Foundation Server" or "Microsoft Visual Studio 2005 Team Foundation Server" folder, under c:\Program Files.
How Quiescing Works
The various TFSQuiesce operations are called "workflows". Here is a brief description of the workflows carried out by TFSQuiesce when quiescing and unquiescing.
Quiesce ATDT workflow
If the quiesce fails for any reason, the changes it has made are rolled back. In other words, if an operation in Quiesce ATDT fails, any previous successful operations are undone, and the server should be restored to its previous operable state.
Unquiesce ATDT workflow
Manual Quiescing / Unquiescing
As previously mentioned, quiescing occurs automatically when you run the service pack or hotfix installations. It is also possible for you to quiesce and unquiesce the server if you are performing other maintenance tasks, and wish to temporarily disable access to Team Foundation Server. Do this by manually executing TFSQuiesce.exe at a command prompt.
Here is the command to quiesce a single server installation:
TFSQuiesce /n:"Quiesce ATDT"
If SQL Server is a named instance, you must specify the machine and instance name with the /s switch, The . indicate the local machine:
TFSQuiesce /n:"Quiesce ATDT" /s:".\<SQLInstanceName>"
So assuming the instance name is TFSSQL, the command would be TFSQuiesce /n:"Quiesce ATDT" /s:".\TFSSQL"
Here is the command to quiesce both the application tier (AT) and data tier (DT) of a dual server installation. Here, because the DT server is remote you must specify the DT machine name, and its SQL instance name if applicable.
TFSQuiesce /n:"Quiesce ATDT" /s:"<DTServerName>[\<SQLInstanceName>]"
So assuming the DT server name is TFSDT and the instance name is TFSSQL, the command would be TFSQuiesce /n:"Quiesce ATDT" /s:"TFSDT\TFSSQL"
After a successful quiesce operation, you will see output like this:
Workflow 'Quiesce ATDT' executed successfully.
After an unsuccessful quiesce operation, you will see output like this:
Workflow 'Quiesce ATDT' failed! ExitCode = 9000.
When you are ready to reenable the server, you re-execute the same command, except replacing "Quiesce" with "Unquiesce". This will once again render your TFS installation operable.
Here is the command to unquiesce a single server installation:
TFSQuiesce /n:"Unquiesce ATDT"
Here is the command to unquiesce a single server installation where SQL Server is a named instance:
TFSQuiesce /n:"Unquiesce ATDT" /s:".\SQLInstanceName"
Here is the command to unquiesce both the application tier (AT) and data tier (DT) of a dual server installation:
TFSQuiesce /n:"Unquiesce ATDT" /s:"DTServerName[\SQLInstanceName]"
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Article ID: 950893 - Last Review: March 26, 2008 - Revision: 1.1
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