This was fixed by upstream:
2014/03/18: Version 10.3.1 - Sebastien Godard (sysstat <at> orange.fr)
WARNING: Daily data files format has changed, and is *not*
compatible with the previous one! [0x2173]
* sar/sadc/sadf: Now take into account a change of CPU count
in datafiles. The number of CPU is displayed in the RESTART
messages.
** Changed in: sysstat (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1470165
Title:
sysstat data corruption when adding or removing VCPUs
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