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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This web page is no longer maintained.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:
2020-10-29 01:15:36

LAN Mirroring Technologies

LAN Mirroring technologies are an important HA technology now, and will remain a key ingredient in many inexpensive HA systems. They allow two machines to mirror a filesystem between themselves with only two NICs and a crossover cable - yielding a system with no SPOFs for a very low price.

  • DRBD: system by Philipp Reisner and LarsEllenberg for mirroring filesystems across the LAN. It is RAID and LAN aware with a quick sync option for bringing the mirror up to date quickly. Recent versions even have a very fast full-sync option. This is the general replication technology which is most commonly used by members of the Linux-HA community, because it provides a complete solution, is sensitive to data integrity issues, and integrates easily with Linux-HA.

  • Enhanced Network Block Device project by P.T. Breuer. ENBD is a project to make the NBD work right. It doesn't combine the NBD and RAID together like DRBD does.

    • Linux Journal article by P.T. Breuer, A. Marin Lopez and Artuo Garcia Ares on The Network Block Device A network block device (NBD) driver makes a remote resource look like a local device in Linux, allowing a cheap and safe real-time mirror to be constructed.

  • NBD server software - the complement to the in-kernel NBD driver.

-- AlanRobertson