Reply to post:

Visa fingers 'very rare' data centre switch glitch for payment meltdown

Nick Stallman

Partial failures like that typically mean the connection can no longer reliably carry traffic, but it still thinks the link is online so it never enacts the fail over procedure.

So no prior failure is required, just the monitoring being told that something is up when it's actually down.

These extremely rare failures actually happen all the time. Earlier this year servers I manage were also knocked offline by a partial failure which prevented automatic fail over.

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