Has anyone seen the following error while doing backups? We have tried different LUNS from different storage pools and are seeing the same result. Here is the error message: Operating system error 665(The requested operation could not be completed due to a file system limitation). NTFS Compression is not enabled on the drives. This failure usually comes when the backup is about half completed. I believe when the backup file size is extended again. We are striping against eight files. The database is 60+ TB. I also saw some references to file fragmentation and I see that these drives show 0% percent. I also saw several references to DBCC CHECKDB and sparse files. We are just doing a full backup and not any DBCC CHECKDBs. The goal would be to do this on a secondary server until any errors are recorded.