You can install the CommServe software using a different SQL Server instance name.
Before You Begin
If the data/configuration information of an existing CommServe component should be retained, these steps should be done first:
- 
Back up the all user databases on the CommServe host 
- 
Uninstall all Commvault software products 
- 
Uninstall the existing SQL instance. 
Procedure
Use native SQL backup tools to create several backup copies of each user database and keep at least one copy in a secure place. Prior to installing the new SQL Server instance, create a registry value containing the new SQL Instance name. Use the following steps to configure the szUserSQLInstanceName registry key:
- 
Log on to the computer as an Administrator or as a member of the Administrator group. 
- 
Click the Windows Start button and then click Run. 
- 
Type regedit and then click OK to open the Registry Editor window. 
- 
Navigate to HKEY_LOCAL_MACHINE > SOFTWARE > GalaxyInstallerFlags . If the key does not exist, create it. 
- 
Right click the GalaxyInstallerFlags key and select New > String Value. 
- 
Specify the Value name as szUserSQLInstanceName. 
- 
Double click szUserSQLInstanceName and in the Value data box, type the name of the SQL instance to use. Click OK. 
- 
Close the Registry Editor window.