What is exactly the difference between following 2 stats:
File System IOPS - Total number of internal I/O requests in I/O per second, for the selected file systems
File System Client IOPS - Total number of file system client I/O requests, in I/O per second for the selected file system

What are exactly those internal I/O requests for File System IOPS ? I mean what does generate this and for what tasks ?
I suspect File System Client IOPS is the real activity generated on the file system coming from the client side, but not clear to me what are those "internal" requests, can someone clarify ? I suppose they corelate...but what is the real difference and what is the sense of measuring both ?