Please use this content only as a guideline. For a detailed installation and configuration guide, please read the DRBD official documentation. Drbd-documentation. RAID 1 over TCP/IP for Linux (user documentation). Drbd is a block device which is designed to build high availability. The DRBD User’s Guide is excellent documentation and reference, you are strongly encouraged to thoroughly read it. Learn how to set it up.

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This node is the one you will consider the primary node in the future cluster setup. To perform this step, issue this command:. DRBD’s synchronization algorithm is efficient in the sense that only those blocks that were changed during the outage must be resynchronized, rather than the device in its entirety. Writes to the primary node are transferred to the lower-level block device and simultaneously propagated to the secondary node s.

Should the primary node fail, a cluster management process promotes the secondary node to a primary state. By using this site, you agree to the Terms of Use and Privacy Policy.

DRBD is a distributed replicated storage system for the Linux platform. Go back to Pandora FMS documentation index. When the failed ex-primary node returns, the system may or may not raise it to documentatioh level again, after device data resynchronization. DRBD detects split brain documentayion the time connectivity becomes available again and the peer nodes exchange the initial DRBD protocol handshake.


This article relies too much on references to primary sources. In our specific case when want to “clusterize” only the database, drrbd we also could replicate a entire Pandora FMS setup, including server, local agents and of course database. The synchronization is logged within the following two syslog messages:. After issuing this command, the initial full synchronization will commence. At the end, bring DRBD resource up, by issuing:.

DRBD is often deployed together with the Pacemaker or Heartbeat cluster resource managers, although it does integrate with other cluster management frameworks. At this drb, unless you configured DRBD to automatically recover from split brain, you must manually intervene by selecting one node whose modifications will be discarded this node is referred to as the split brain victim. You operate with the Rocumentation block device, forget to use physical device.

The last command to setup DRBD, and only on the primary node, it’s to initialize the resource and set as primary:. Navigation menu Toggle navigation. It is implemented as a kernel driver, several userspace management documentafion, and some shell scripts. Conventional computer cluster systems typically use some sort of shared storage for data being used by cluster resources.

In contrast, with DRBD there are two instances of the application, and each can read only from one of the two storage devices. The tell-tale sign of this is a message like the following appearing in the system log:.

On the other node the split brain survivorif its connection state is also StandAlone, you would enter:. vocumentation

Distributed Replicated Block Device

Consequently, in that case that application instance shuts down and the other application instance, tied to the surviving copy of the data, takes over.


Archived copy as title Debd lacking reliable references from February All articles lacking reliable references Pages using Infobox software with unknown parameters All articles with unsourced statements Articles with unsourced statements from May Official website different in Wikidata and Wikipedia. A free mail server version is also available, as well as the business mail server and the MSP mail serverfor Managed Service Providers, which also include features like personal organizer, AntiVirus, AntiSpam, or advanced security policies.

By now, your DRBD device is fully operational, even before the initial synchronization has completed albeit with slightly reduced performance.

Pandora:Documentation en:DRBD – Pandora FMS Wiki

Please use this content only as a guideline. General Architecture High Availability: A DRBD can be used as the basis of.

DRBD’s authors originally submitted the software to the Linux kernel community in Julyfor possible inclusion in the canonical kernel. It integrates with virtualization solutions such as Xenand may be used both below and on top of the Linux LVM stack.

Cluster deployment with DRBD. It may take some time depending on the size documentatiion the device. Over DRBD you can provide a cluster on almost everything you can replicate in disk.