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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Remember to perform this step frbd on the primary node. Over DRBD you can provide a cluster on almost everything you can replicate in disk. When a storage device fails, the RAID layer chooses to read the other, without the application instance knowing of the failure. DRBD is part of the Lisog open source stack initiative.
When the application reads, the RAID layer chooses the storage device to read. Cluster deployment with DRBD. Views Read Edit View history.
You can get more information about DRBD in their website at http: This need to be documenttaion before a DRBD resource can be taken online for the first time, thus only on initial device creation:. Do not attempt to perform the same synchronization on the secondary node, it must be performed only once on the primary node.
This article relies too much on references to primary sources. Linux Linux kernel features Portal: Put the server view in autorefresh mode with 5 secs of interval:.
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Drbd-documentation – Free Software Directory
Should the primary node fail, a cluster management process promotes the secondary node to a primary state. From Wikipedia, the free encyclopedia.
In contrast, with DRBD there are two instances of the application, and each can read only from one of the two storage devices. Free and open-source software portal. However you could install the drbd package at this moment version 8.
You operate with the DRBD block device, forget to use physical device. Go back to Pandora FMS documentation index. Master node castor should have the virtual IP address. Next, you have to initialize the DRBD resource meta data. In RAID, the redundancy exists in a layer transparent to the storage-using application.
Do it ONLY in the primary node, will be replicated to the other nodes automatically. DRBD is often deployed together with the Pacemaker or Heartbeat cluster resource managers, although it does integrate with other cluster management frameworks.
Distributed Replicated Block Device
On the other node the split brain survivorif its connection state is also StandAlone, you would enter:. Archived from the original on Following steps must be performed on both nodes unless specified otherwise. General Architecture High Availability: After issuing this command, the initial full synchronization will commence. 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 crbd, AntiVirus, AntiSpam, or advanced erbd policies.
If DRBD detects that both nodes are or were at some point, while disconnected in the primary role, it documentahion tears down the replication connection. 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 this stage, you will need to perform the operations described only on the primary node. This approach has a number of disadvantages, which DRBD may help offset:. This page was last edited on 24 Decemberat