openstack/openstack-manuals
Code Issues Proposed changes
f41c6bedfb
openstack-manuals/doc/ha-guide-draft/source/intro-ha.rst
ihutchin e4f9185c54 [ha-guide-draft] Create ha-guide draft directory 
This creates a new ha-guide-draft directory to allow developing the
guide. Add infrastructure for:
* The draft guide is not translated currently.
* Build RST version (but not PDF yet) with each run.
* Publish guide as draft
* Update built index for it.

Also updates the ToC to reflect the proposed changes.

Implements: blueprint implement-ha-guide-todos

Change-Id: If6f65646e02ac3eac08c288fd727ab9851cf9569
2017-03-20 11:34:24 +00:00

931 B
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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