Sean, This is most likely a SQL Server permissions issue. Make sure you have give SYSADMIN authority to the userid running the SQL Server backup for the default instance.
Thanks, Del ---------------------------------------------------- "ADSM: Dist Stor Manager" <[email protected]> wrote on 09/13/2007 02:45:17 PM: > I have a Win2k3 server with 2 instances of SQL 2005. I am unable to > backup the default instance, but I can backup the named instance > without error. > > When I attempt to backup the default, I get the error ACO5402E - > Virtual Device Set could not be created. > > There is no entry in the vdi.log file on the server. And the fact > that the named instance works, leads me to believe it is not the > sqlvdi.dll as mentioned in some other posts regarding the Virtual > Device Set error. > > Any suggestions would be greatly appreciated. > >
