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You can only install Microsoft Message Queue Server (MSMQ) site controllers in a cluster environment from Microsoft Windows NT Server 4.0 Enterprise Edition. This is because you must install the limited version of Microsoft SQL Server version 6.5 from the Windows NT Server 4.0 Enterprise Edition CD first. You can then upgrade this limited version of SQL Server to SQL Server 6.5 Enterprise Edition after completing the installation of MSMQ. It is not possible to install MSMQ on a cluster when SQL Server 6.5 Enterprise Edition is already installed.
The limited version of SQL Server that comes with Microsoft Windows NT Server 4.0 Enterprise Edition does not cluster in the same way that SQL Server 6.5 Enterprise Edition does. This limits the upgraded SQL Server from having its own Virtual Server ID (Resource Name and IP Address). It also restricts the clustered SQL Server to an Active/Passive configuration.
MSMQ Routing Servers and Independent clients do not have any requirement for SQL Server and, in general, are easier to install and maintain within a Microsoft Cluster environment.
The "What's New in SQL Server 6.5" documentation, included with SQL Server version 6.5 Enterprise Edition, states in one section that upgrading the limited SQL Server version to the full SQL Server 6.5 Enterprise Edition cannot be done, but in another place implies that it can be done. This article explains how to perform the upgrade.
Only upgrading from Windows NT Server 4.0 Enterprise Edition versions of the software has been tested. This process does not apply if the Windows NT Option Pack has already been used to update the cluster. Installation of an MSMQ Primary Site Controller (PSC) on a cluster can only be done in conjunction with Windows NT 4.0 Option Pack. Therefore, it is only possible to upgrade an MSMQ Primary Enterprise Controller (PEC) or Backup Site Controller (BSC) that has not had Windows NT 4.0 Option Pack installed.
Use the following steps to upgrade:
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