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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A DRBD can be used as the basis of.

In RAID, the redundancy exists in a layer transparent to the storage-using application. Retrieved from ” https: Should one storage device fail, the application instance tied to that device can no longer read the data.

Drbd-documentation – Free Software Directory

Over DRBD you can provide a cluster on almost everything you can replicate in disk. Start a web browser and open a session. Archived copy as title Articles 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.

We suppose you have all docukentation information about mysql in following directories may differ depending on Linux distro:. Do it ONLY in the primary node, will be replicated to the other nodes automatically. While there are two storage devices, there is only one instance of the application and the application is not aware of multiple copies.

It is implemented as a kernel driver, several userspace management applications, and some shell scripts. A disadvantage is the lower time required to write directly to a shared storage device than to route the write through the other node. General comparison Distributions list Netbook-specific comparison Distributions that run from RAM Lightweight Security-focused operating system Proprietary software for Linux Package manager Package format List of software package managers.


Conventional computer cluster systems typically use some sort of shared storage for data being used by cluster resources. Views Read Edit View history.

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. After issuing this command, the initial full synchronization will commence. DRBD bears a superficial similarity to RAID-1 documfntation that it involves a copy of data on two storage devices, such that if one fails, the data on the other can be used.

DRBD – Linux-HA

General Architecture High Availability: 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.

DRBD is a distributed replicated storage system for the Linux platform. Please use this content only as a guideline. The tell-tale sign of this is a message like the following appearing in the system log:.

Distributed Replicated Block Device

This page was last edited on 24 Decemberat Cluster deployment with DRBD. This approach has a number of disadvantages, which DRBD may help offset:. Do not attempt to perform the same synchronization documenttion the secondary node, it must be performed only once on the primary node.


DRBD’s authors originally submitted the software to the Linux kernel community in Julyfor possible inclusion in the canonical kernel.

If DRBD detects that both nodes are or were at some point, while disconnected in the primary role, it immediately tears down the replication connection. Go back to Pandora FMS documentation index.

The initial full synchronization of the two nodes must be performed on only one node, only on initial resource configuration, and only on the node you selected as the synchronization source.


Free and open-source software portal. The last command to setup DRBD, and only on the primary node, it’s to initialize the resource and set as primary:. To perform this step, issue this command:. The synchronization is logged within the following two syslog messages:. In contrast, with DRBD there are two documejtation of the application, and each can read only from one of the two storage devices.

The data marked with bold italic is the one that must be replaced with actual data from your specific setup. At this point, unless you configured DRBD to automatically recover from split brain, you must manually intervene by selecting one node whose modifications will be discarded this drbr is referred to as the split brain victim.