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We had an an extra UPS layer feeding high-priority core routers for some of DC02. That UPS failed by still sending out full voltage but no current. This resulted in routers trying to use the powersource but since there was no power they werent able to fully power despite having multiple feeds with feeds from other sources.

Systems are running now on dual redundant UPSs and the extra UPS has been removed.

This is a very rare problem (we have never seen it before) since normally the UPS will fail and power will switch with no downtime to other sources.

The issue affected some of the datacenter core and some of the customers in DC02.

Power was restored at 19:22.

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Technicians are on their way to datacenter. ETA is 30 minutes.

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