title: du warning for netapp data ontap backend
body: <p>I ran the following command
  du --apparent-size --block-size=1 --summarize /mnt2/nfspools/_root_root_p1
  PS: /mnt2/nfspools/_root_root_p1 is mount point for volume in data ontap filer.</p>
  
  <p>I got the following output:</p>
  
  <p>du: WARNING: Circular directory structure.
  This almost certainly means that you have a corrupted file system.
  NOTIFY YOUR SYSTEM MANAGER.
  The following directory is part of the cycle:
    `/mnt2/nfspools/_root_root_p1/.snapshot/hourly.0'</p>
  
  <p>du: WARNING: Circular directory structure.
  This almost certainly means that you have a corrupted file system.
  NOTIFY YOUR SYSTEM MANAGER.
  The following directory is part of the cycle:
    `/mnt2/nfspools/_root_root_p1/.snapshot/nightly.0'</p>
  
  <p>du: WARNING: Circular directory structure.
  This almost certainly means that you have a corrupted file system.
  NOTIFY YOUR SYSTEM MANAGER.
  The following directory is part of the cycle:
    `/mnt2/nfspools/_root_root_p1/.snapshot/hourly.1'</p>
  
  <p>du: WARNING: Circular directory structure.
  This almost certainly means that you have a corrupted file system.
  NOTIFY YOUR SYSTEM MANAGER.
  The following directory is part of the cycle:
    `/mnt2/nfspools/_root_root_p1/.snapshot/hourly.2'</p>
  
  <p>du: WARNING: Circular directory structure.
  This almost certainly means that you have a corrupted file system.
  NOTIFY YOUR SYSTEM MANAGER.
  The following directory is part of the cycle:
    `/mnt2/nfspools/_root_root_p1/.snapshot/hourly.3'</p>
  
  <p>16384   /mnt2/nfspools/_root_root_p1</p>
  
  <p>is there any setting I can do netapp data ontap to avoid this warning when I run du command?</p>