What is DRBD split brain?

Split-brain means that the contents of the backing devices of your DRBD resource on both sides of your cluster started to diverge. Different writes happened to both sides of your cluster afterwards. After reconnecting, DRBD doesn’t know which set of data is “right” and which is “wrong”.

What is pacemaker DRBD?

Active-Passive Cluster for Near HA Using Pacemaker, DRBD, Corosync and MySQL. DRBD stands for Distributed Replicated Block Device. It works, as the name implies, by replicating blocks. It is not a shared device.

How do you fix a split brain?

To resolve the “split brain” scenario, perform a Forced Standby operation from the repaired Active node. This forces the repaired Active node to become the Standby node in the HA pair.

How do I check my DRBD status?

You can view the status of the drbd application by running cat /proc/drbd from the command line of a cluster member. ds. disk state (State of the hard disks. The local disk state is always displayed first, the remote disk state last).

How do you use DRBD?

Install and Configure DRBD on CentOS 8

  1. Step 1 – Create an Atlantic.Net Cloud Server.
  2. Step 2 – Setup Hostname on Each Node.
  3. Step 3 – Prepare Storage Device on Each Node.
  4. Step 4 – Install DRBD.
  5. Step 5 – Configure DRBD Resource.
  6. Step 6 – Initialize and Enable DRDB Resource.

What is Linbit?

www.linbit.com/drbd/ DRBD is a distributed replicated storage system for the Linux platform. It is implemented as a kernel driver, several userspace management applications, and some shell scripts.

What does a pacemaker control?

A pacemaker is a small device that’s placed (implanted) in your chest to help control your heartbeat. It’s used to prevent your heart from beating too slowly. Implanting a pacemaker in your chest requires a surgical procedure. A pacemaker is also called a cardiac pacing device.

What is pacemaker Corosync?

Corosync is an open source program that provides cluster membership and messaging capabilities, often referred to as the messaging layer, to client servers. In essence, Corosync enables servers to communicate as a cluster, while Pacemaker provides the ability to control how the cluster behaves.

How do you fix gluster split brain?

1. Fixing split-brain using Gluster CLI

  1. With a bigger source file. For per file healing we use a known file with a bigger size as the source.
  2. Source files with latest mtime.
  3. Using one brick in replica as the source for one file.
  4. Using one brick in replica as the source for all files.

What is DRBD diskless?

Diskless. No local block device has been assigned to the DRBD driver. This may mean that the resource has never attached to its backing device, that it has been manually detached using drbdadm detach, or that it automatically detached after a lower-level I/O error.

Is Drbd synchronous?

DRBD supports both synchronous and asynchronous write operations, which will be further discussed below in relation to the three protocol setups.