openstack/ha-guide
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ha-guide/doc/source/intro-ha.rst
Adam Spiers 393604c6b7 import draft from openstack-manuals/doc/ha-guide-draft/ 
Move the draft of the restructured HA guide to this dedicated
repository, in order to focus reviews on a smaller, more specialist
audience and accelerate development.

Change-Id: I95a4b46fecaafafd1beb8314d1cf795b60fb17a8
2018-11-23 00:55:15 +00:00

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Introduction to high availability

High availability systems seek to minimize the following issues:

  1. System downtime: Occurs when a user-facing service is unavailable beyond a specified maximum amount of time.
  2. Data loss: Accidental deletion or destruction of data.

Most high availability systems guarantee protection against system downtime and data loss only in the event of a single failure. However, they are also expected to protect against cascading failures, where a single failure deteriorates into a series of consequential failures. Many service providers guarantee a Service Level Agreement (SLA) including uptime percentage of computing service, which is calculated based on the available time and system downtime excluding planned outage time.

intro-ha-key-concepts.rst intro-ha-common-tech.rst