[Bug 307961] [NEW] Disk total stats are double

[Noel J. Bergman]

Public bug reported:

Consider the following:

~$  dstat --disk -Dtotal,sdb1,sdc1
 -dsk/total----dsk/sdb1----dsk/sdc1-
 read  writ: read  writ: read  writ
 507k  461k:  46k    0 : 5.4B   43k
 43M   53M:  21M    0 :   0    26M
 38M   31M:  19M    0 :   0    15M
 42M   35M:  21M    0 :   0    17M

and also:

$  dstat --disk -Dtotal,sdb,sdc
-dsk/total----dsk/sdb-----dsk/sdc--
 read  writ: read  writ: read  writ
 510k  464k:  47k    0 : 9.6B   45k
  53M   55M:  27M    0 :   0    27M
  35M   41M:  18M    0 :   0    20M
 103M   94M:  52M    0 :   0    46M

Notice that the disk/total for read and write is double that of the actual disk. Based upon looking at (trimmed):
~$  dstat -f
 --dsk/sda-----dsk/sda1---dsk/sda10----dsk/sda2----dsk/sda5----dsk/sda6----dsk/sda7----dsk/sda8----dsk/sda9----dsk/sdb-----dsk/sdb1----dsk/sdc-----dsk/sdc1-
 read  writ: read  writ: read  writ: read  writ: read  writ: read  writ: read  writ: read  writ: read  writ: read  writ: read  writ: read  writ: read  writ
 209k  189k: 3.7B    0 : 157k  129k:   0     0 : 1.2B    0 : 1.1B    0 :   1B    0 :  51k   59k:  90B  766B: 270k    0 : 270k    0 : 9.5B  267k: 5.3B  267k
 884k  220k:   0     0 :   0  8192B:   0     0 :   0     0 :   0     0 :   0     0 : 884k  212k:   0     0 :  24M    0 :  24M    0 :   0    14M:   0    14M
   0   188k:   0     0 :   0     0 :   0     0 :   0     0 :   0     0 :   0     0 :   0   188k:   0     0 :  25M    0 :  25M    0 :   0    29M:   0    29M

 I suspect that dstat is processing both sd<x> and sd<x><y>, e.g., sda &
sda1, resulting in the doubled values.

** Affects: dstat (Ubuntu)
     Importance: Undecided
         Status: New

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Disk total stats are double
https://bugs.launchpad.net/bugs/307961
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