Cooool feature
SQL 2005 to SQL 2008 upgraded in cluster environment is very very interesting and fantastic. Yes, it is really amazing. There are no downtime required for SQL 2008 upgrade. Start upgraded from passive mode and finally move active node to passive node and upgrade. For example environment has 3 cluster node with named clusa, clusb, clusc nodes. clusa is active remaining are passive node. Apply upgrade in passive node one by one. Setup wont upgrade all instances simultaneously. during this upgraded SQL server is online and running with SQL 2005 version. Once upgraded is completed in passive node than move cluster resources to passive node. Now you will the big surprise, yes... SQL server is running in clusb with SQL 2008 version. Finally upgrade SQL 2008 on clusa.
Error Message
Cannot execute a program. The command being executed as "c:\WINDOWS\microsoft.NET\Framework\v2.0.50727\csc.exe" /noconfig /fullpaths @"c:\Documents and Settings sqlservices\Local settings\Temp\hin6evfc.cmdline".
Resolution
IIS admin service is bloking .NET freamwork installation. Just stop IIS admin service in service control manager. Now SQL 2008 upgrade will run without any issues.
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