Servers: Database consolidation on Dell PowerEdge R810 servers18Figure 7. Choosing features for installation.On the first installation, choose to install the defaultinstance. On subsequent installations on thesame server, choose named instance and providea name for the instance.Configure the credentials of the SQL Server serviceaccount and SQL Server Agent accounts.Specify SQL Server administrators and also specifythe authentication mode desired for yourconfiguration. Microsoft recommends WindowsAuthentication mode, but legacy applications mayrequire SQL Server authentication.Complete the installation.Installing the database instancesWhile there can be only one default instance, SQL Server 2008 R2,as with previous versions of SQL Server, allows you to havemultiple named instances. These instances function largelyindependently of one another; each has its own security contexts,collation settings, etc. (For more information, seehttp://msdn.microsoft.com/en-us/library/ms143531(SQL.105).aspx.)To install one or more named instances, as we did for our testing,follow the same procedures as installing a default instance, withthe exception of a few configuration changes during the process.First, on the Feature Selection screen, if you are installing a named