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Chapter 1. Understanding High Availability > The Quality of Service Guarantee

The Quality of Service Guarantee

For high-bandwidth network transmissions, Quality of Service (QoS) is the idea that a network provider can predetermine and guarantee transmission rates and network quality for a client. Clients can choose a certain QoS bandwidth guarantee from a network provider, and the network will prioritize packet transmissions for that client based on a predetermined service level through the use of the Resource Reservation Protocol. This type of guarantee has become essential with the growing popularity of streaming-video multicasts. A client who plans to broadcast a high-bandwidth event at a specific date and time can contact the service provider and order the appropriate bandwidth reservation to get prioritized delivery of packets during that reservation period.

Another possible QoS guarantee may ensure 99.999 percent availability of the internal local network, individual server uptime of 99.9 percent, and clustered server uptime of 99.99 percent. The QoS guarantee ensures that your site won't be inaccessible at a critical time.


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