By default, Windows SMB (CIFS) sessions time out after 60 seconds. The Quantum DXi may not respond to rename requests within 60 seconds if the file to be renamed is being processed by a deduplication job. When Windows closes the SMB connection, it reports the error message “The specified network name is no longer available.”
Veeam Backup & Replication assumes that when a rename request fails, the file is not renamed. However, the Quantum DXi does rename the file.