Hi,
sorry for the late reply but I'm clearing old bugs atm.

The initial report of the sysstat package are most often confusing.
It is reporting essentially everything since the kernel count.
That could in your case e.g. be some huge sets of I/O from raid creation or 
whatever else you did before.

You can either run it in an interval like
$ iostat 5

And check if the further data doesn't match (it was ok in my test across all 
releases).
Since this is confusing so many people the tools have an option for it:

-y     Omit first report with statistics since system boot, if
displaying multiple records at given interval.

Therefore I don't think this is a bug in Ubuntu and mark it incomplete.
Please set back to new and explain if you do not agree.

** Changed in: sysstat (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1477347

Title:
  Output from iostat has the total read and total write columns
  backwards in Ubuntu 14.04

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