Your network contains an Active Directory domain. The domain contains five domain controllers.  
A domain controller named DC1 has the DHCP role and the file server role installed.  
You need to move the Active Directory database on DC1 to an alternate location. The solution must  minimize impact on the network during the database move.  
What should you do first（）

Your network contains a domain controller that runs Windows Server 2008 R2.  
You run the following command on the domain controller：  
dsamain.exe  dbpath c：\$SNAP_201006170326_VOLUMEC$\Windows\NTDS\ntds.dit  ldapport 389  
-allowNonAdminAccess  
The command fails.  
You need to ensure that the command completes successfully.  
How should you modify the command（）