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====High availability==== {{Main|High availability}} Various metrics exist for measuring the data-availability that results from data-center availability beyond 95% uptime, with the top of the scale counting how many ''nines'' can be placed after ''99%''.<ref>{{Cite web|url=https://www.youtube.com/watch?v=DPcM5UePTY0| archive-url=https://web.archive.org/web/20120829083144/http://www.youtube.com/watch?v=DPcM5UePTY0&gl=US&hl=en| archive-date=2012-08-29 | url-status=dead|title=IBM zEnterprise EC12 Business Value Video| website=[[YouTube]] }}</ref>
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