[outages] Equifax Outage: Root Cause Analysis.

[virendra rode]

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Outage start time: 4/26/2009 - 3:28pm EST
Outage end time: 4/29/2009 - 2:45am EST

It appears this outage was a result of a transformer failure within
their power distribution panel at their Alpharetta data center.


Root Cause:

Failure of a defective transformer in a UPS system B distribution panel
which resulted in a loss of power to certain critical system components
in the data center. Apparently the system did not automatically failover
 to the redundant system A power as designed because system A power
distribution panel breaker was left in a non-redundant state for some
unknown reason. Consequently it took down their core network down
including their mainframe / midrange systems.



regards,
/virendra

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