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Drbd

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drbd

http://www.drbd.org/
'drbd' is a block device for building high-availability clusters. DRBD takes over the data, writes it to the local disk and sends it to the other host. On the other host, it takes it to the disk there. The other components needed are a cluster membership service, which is supposed to be heartbeat, and an application that works on top of a block device (ie, a filesystem and fsck). Each device has either a 'primary' or 'secondary' state. The application should run and access the device on the node with the primary device. Every write is sent to the local 'lower level block device' and to the node with the device in 'secondary' state. The secondary device then writes the data to its lower level block device. If the primary node fails, heartbeat is switching the secondary device into primary state and starts the application there. If the failed node comes up again, it is a new secondary node and will synchronise its content to the primary node whithout interruption of service in the background. Only those parts of the device that actually have been changed will resync.




Licensing

LicenseVerified byVerified onNotes
GPLv2orlaterJanet Casey2 February 2005



Leaders and contributors

Contact(s)Role
"Email l.g.e@web.de" Lars Ellenberg Contributor
"Email philipp.reisner@linbit.com" Philipp Reisner Maintainer


Resources and communication

Audience Resource type URI
Developer E-mail mailto:drbd-dev@lists.linbit.com
Support E-mail mailto:drbd-user@lists.linbit.com
Help E-mail mailto:drbd-announce@lists.linbit.com


Software prerequisites

This entry (in part or in whole) was last reviewed on 7 January 2008.



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The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.


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