Some EMC device name is not displayed by `sar -dp` command

Issue

• sar -d command is able to display all devices. But while running sar -dp command, some EMC device names are not displayed.

  For example:

  $ sar -d  | grep "dev120-400 
  output:
  12:01:01 AM dev120-400     44.73      4.78    161.40      3.71      0.01      0.13      0.13      0.58
  12:02:01 AM dev120-400     42.03      0.40    136.11      3.25      0.00      0.12      0.11      0.48
  12:03:01 AM dev120-400     39.62      5.06    137.99      3.61      0.01      0.13      0.12      0.49
  12:04:01 AM dev120-400     44.62      2.66    167.97      3.82      0.01      0.14      0.13      0.60
  12:05:01 AM dev120-400     49.70      4.91    187.83      3.88      0.01      0.12      0.12      0.59
  12:06:02 AM dev120-400     59.62      0.40    226.84      3.81      0.01      0.13      0.12      0.74
  

  According to ls -l /dev/ output:

  120:400 -> ../emcpowerz
  

  But the sar -dp command does not show above device in its output:

  $ sar -dp | grep emcpowerz
  No output.