you can run fsck but we had an issue that required "full" fsck (whatever that means) and they actually had to take file system offline.  from the man pages:  If FSCK is started on a mounted file system, the file system will be unavailable for the duration of the FSCK. NFS clients will see an NFS server not responding message and CIFS clients will lose connectivity with the server and will have to remap shares.
Backups started failing on one of our Celerra File Systems (4 - 5 Days).  Backups were running successfully.  So our backup team started pointing fingers at the Celerra File System.  So we decided to backup our Replicated File System and it failed as well.  So as you can imagine, my back is to the wall.  I'm requesting that they break the job down to see if they can pinpoint a specific folder.  They want me to find the spot well it's a 2TB File System.  I'm probably going to open a support case.  I was just wondering if EMC Support has any tools available that will run checks on Production File Systems?  Thanks,  Damian
Are there any EMC Tools available that will verify corruption on Celerra File 
Systems?