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Microsoft® Lync® Server 2013 Unleashed Second Edition by Randy Wintle, Alex Lewis, David Ross, Tom Pacyk

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What Do Service Levels Really Mean?

Availability is defined as the level of redundancy applied to a system for ensuring an absolute degree of operational continuity during planned and unplanned outages. Many organizations will require that Lync Server systems are available without service interruption at all times. However, many people forget to consider the impact that regular maintenance on the Lync systems, as well as contributing components such as the network and directory services, can have on the availability of Lync. When an organization states that they want to have “five 9’s” of availability for Lync, it would mean that the Lync service can have no more than 5.256 minutes of downtime for the entire year! SLA percentages are often misunderstood, ...

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