I had a similar problem. One of my customers is using SMSQL against NFS volumes.
Without reason SMSQL started having trouble backing up the SnapInfo volume. I wasn't able to create new snapshots using named sqlinfo__XXX__recent using SMSQL / SnapDrive. I just got an error telling me that the snapshot name already existed. It didn't on the filer / SnapDrive / SMSQL.
I tried almost everything including reinstalling SD/SMSQL but nothing worked until i found this post. The problem I had looked like this:
The complete operation list is shown as follows Server Name: *********************
1. Preparing LUNs for Snapshot copy creation
2. Creating a Snapshot copy for the LUN
3. Creation of backup (sqlinfo__XXX__recent) failed. Reason: (The backup or job name sqlinfo__XXX__recent already exists. Names must be unique.).
When editing the XLM file I found an entry with the snapshot name. The status of the job was u"running". Deleting this entry solved the problem.
Thanks for the response. Actually, I am looking to clean up the SMVI catalog (not the Virtual Center environment). The SMVI catalog shows several backups that are mounted even thought the underlying NetApp volume does not even exist anymore. I just want to clean up the SMVI catalog with the "smvi backup delete......" and "smvi backup unmount....." commands. If I try to do this, I get messages that indicate issues with conecting to the volume (because it does not exist).