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Providing Open Source High-Availability Software for Linux and other OSes since 1999.

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This web page is no longer maintained. Information presented here exists only to avoid breaking historical links.
The Project stays maintained, and lives on: see the Linux-HA Reference Documentation.
To get rid of this notice, you may want to browse the old wiki instead.

1 February 2010 Hearbeat 3.0.2 released see the Release Notes

18 January 2009 Pacemaker 1.0.7 released see the Release Notes

16 November 2009 LINBIT new Heartbeat Steward see the Announcement

Last site update:
2020-11-29 13:26:34

Complexity and Reliability

AlanRobertson's battle cry is Complexity Is The Enemy of Reliability!

There are several reasons he believes this to be true:

  • Simple software works. Complex software works sometimes.
  • In a properly designed and installed HA system, most of the notable outages are caused by HumanError. SysAdmins make far more mistakes when they do not understand how their system works.

    Simple systems are far more likely to be correctly understood by the SysAdmins that manage them, than are complex systems. This is particularly true when working with too little sleep or too much pressure.

    Both circumstances are common to SysAdmins. As a result, more errors are made in managing complex systems than in managing simple ones.

For these reasons, the Linux-HA project strives to keep their software as simple and understandable as possible.

See Also

ThePrincipleOfLeastSurprise, SimplicityIsHard