[Bug 990160] [NEW] wrong Blk_read/s

[dododoth]

Public bug reported:

1) 10.04 LTS
2)  9.0.6-2
3) showing the right values in all "per second" columns
4) showing wrong values
```
$ iostat -t
Linux 2.6.32-34-generic (ss) 	04/28/2012 	_x86_64_	(1 CPU)

04/28/2012 12:28:25 AM
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.39    0.07   10.22    2.07    0.00   87.25

Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
sda             102.91         4.22     21939.02     565427 2936331398
sdb             170.85     39834.11       265.17 5331421656   35489902
sdc              31.55     17852.25       220.41 2389356442   29500048
sdd              31.03     17852.20       218.15 2389350168   29197360
sde              29.96     17852.29       215.03 2389361512   28779824
sdf              30.41     17852.08       214.63 2389333032   28726848
sdg               0.43        12.35        10.17    1653563    1361800
md5             107.23       187.16       834.43   25049738  111680104
dm-0            106.03        35.92       834.42    4807210  111679920
md0               0.59        92.46        45.40   12375290    6076800

$ iostat -t
Linux 2.6.32-34-generic (ss) 	04/28/2012 	_x86_64_	(1 CPU)

04/28/2012 12:28:48 AM
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.39    0.07   10.22    2.07    0.00   87.26

Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
sda             102.89         4.22     21935.16     565427 2936331398
sdb             170.82     39827.11       265.12 5331421656   35489902
sdc              31.54     17849.11       220.37 2389356442   29500048
sdd              31.02     17849.07       218.11 2389350168   29197360
sde              29.95     17849.15       214.99 2389361512   28779824
sdf              30.40     17848.94       214.60 2389333032   28726848
sdg               0.43        12.35        10.17    1653579    1361800
md5             107.21       187.13       834.28   25049738  111680104
dm-0            106.01        35.91       834.28    4807210  111679920
md0               0.59        92.45        45.40   12375290    6076800
```

/dev/sd[abcdef] are in a mdadm raid i grew and rebuilt, that's where the high numbers come from
here a short example of what's wrong
```
Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
sdb             170.85     39834.11       265.17 5331421656   35489902       @04/28/2012 12:28:25 AM
sdb             170.82     39827.11       265.12 5331421656   35489902       @04/28/2012 12:28:48 AM
```
13 seconds have past, the Blk_read rate has NOT changed, but still see 39827.11 Blk_read/s. that number is slowly decreasing over time. it drops about 0.3 per second. so in about 1 and a half days, it should be down to zero

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

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https://bugs.launchpad.net/bugs/990160

Title:
  wrong Blk_read/s

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