This post explains you about the DRBD (Distributed Replicated Block Device) to understand What is DRBD (Distributed Replicated Block. Distributed Replicated Block Device (DRBD) mirrors block devices between multiple hosts. The replication is transparent to other applications on the host. This step-by-step tutorial demonstrates how to install Distributed Replicated Block Device (DRBD) on CentOS Linux.
|Published (Last):||21 October 2009|
|PDF File Size:||12.47 Mb|
|ePub File Size:||19.97 Mb|
|Price:||Free* [*Free Regsitration Required]|
Please login to server OEL and do the same steps from above: More information can be found at http: Recovering from split-brain Test 1: We must identify the drbd versions supported by our kernel.
As with any form of data replication, always ensure you have good backups before you begin, and ensure that you have good backups throughout the life cycle of the setup.
DrBd last modified Any block device hard disks, partitions, RAID devices, logical volumes, etc can be mirrored. Please refer to the appropriate guides. This could take several hours. Recovering from split-brain In the event of split-brain, you may be able to correct it by performing the following, but do not do this blindly! It’s necessary that the server you’d like to install DRBD on has a free block-device. Session expired Please log in again.
If the web address has no language suffix, the preferred language specified in your web browser’s settings is used.
HowTos/Ha-Drbd – CentOS Wiki
Below are some basic test scenarios you can simulate pretty drgd. This will provide the DKMS-based kernel module and dbd tools. After restarting the source node with stable shipped kernel, the sync process started immediatly.
This setup is of course not suitable in production, the use of loop devices it is not recommended due to deadlock issues. On both servers, setup: This path are needed to store the rpm file after we’ve build the DRBD packages.
How to setup DRBD
You can think of this loosely as network Raid 1. In this particular case, I used squeeze-stable on the target and squeeze-backports on the source. DRBD can be understood as a high availability for hardware and can be viewed as a replacement of network shared storages.
After logging in you can close it and return to this page. Now we can use yum to install drbd packages. First we need to install DRBD packages which is used to create a virtual disk drbd0.
You can choose the displayed language by adding a language suffix to the web address so it ends with e.
How to Install DRBD on CentOS Linux – Linux Handbook
Module drbd not found. On the drbd01or whichever host you wish to be the primary, enter the following:. You can check the status by: Make sure you understand what this is doing before you run it on your production hiwto, otherwise you may lose data you wanted! Or just shutdown drbd01 primaryand then log into drbd02 secondaryand promote it to master:.
This is not a DRBD limitation, but rather a limitation of the common file systems ext3, ext4, xfs, etcsince they cannot account for 2 or more servers accessing a single disk. The initialization must be done on both, too. The default is usage-count ask; which will prompt you everytime you upgrade DRBD. Testing secondary node failure Test 3: Testing secondary node failure To see what happens when the secondary server goes offline: Now do below steps on server OEL vrbd.
Now we’ve coming to final step which is the configuration of DRBD.
I am a Linux lover and an open-source activist. Skip to primary navigation Skip to content Skip to primary sidebar You are here: Now, we’ve come to the final part which is testing of the DRBD service to ensure it meets the objective. Hosting provided by Metropolitan Area Network Darmstadt.
On each server execute:. The example end result will show how to create files or folders inside a partition on Server A and successfully show all the drgd on another server Server B using DRBD.