Found the culprit in my setup.
It was due to the case that XEN was configured to un-plug 2 CPUs for dom0.
This happens after /etc/init.d/sysstat start has been run so the
file gets corrupt.
Not sure if this should be worked around in sysstat or if it's wrong
to use this function.
My new
If this is the same problem as I see on some hosts then after each
reboot I need to do the following.
Remove invalid sa files (can be identified by the small size since
they don't update but remove all in this example).
# rm /var/log/sysstat/sa??
Run the sysstat init script again to
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