openstack
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ha-guide
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Add SLA to introduction 

Change-Id: Ie6e8a5cc4d817fa87da7c88824f4986a4207133c
Closes-Bug: #1414104
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KATO Tomoyuki 2015-12-26 14:03:26 +09:00
parent 2e81ea0d04
commit 2962d416a5
1 changed files with 4 additions and 2 deletions
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6
doc/ha-guide/source/intro-ha-concepts.rst
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@ -14,8 +14,10 @@ High availability systems seek to minimize two things:
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.
where a single failure deteriorates into a series of consequential failures.
Many service providers guarantee :term:`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.
Redundancy and failover
~~~~~~~~~~~~~~~~~~~~~~~