[Case] Debug w/r speed in nfs file system

• identify all the process related

• identify the file system and its version

• measure the r/w speed at different process

• if the outer driver involved, unmount and mount it again

Notes:

• You might find below command helpful:`dd if=path/to/input_file of=/path/to/output_file bs=block_size count=number_of_blocks`

• If multiple small files are involved to test the speed, please test on a large file as well; because there are additional link creation processed related to multiple small files.