How to resolve split brain in gluster?

How to resolve split brain in gluster?

Quick Start:

1. Get the path of the file that is in split-brain:
2. Close the applications that opened this file from the mount point.
3. Decide on the correct copy:
4. Reset the relevant extended attribute on the brick(s) that contains the ‘bad copy’ of the file data/metadata using the setfattr command.

How do I remove gluster volume?

Deleting Volumes

1. Delete the volume using the following command: # gluster volume delete
2. Enter y to confirm the operation. The command displays the following: Deleting volume test-volume has been successful.

What is gluster brick?

Brick : A Brick is the basic unit of storage in GlusterFS, represented by an export directory on a server in the trusted storage pool.

How can I check my GlusterFS status?

To verify a GlusterFS cluster status:

1. Log in to the Salt Master node.
2. Verify that the GlusterFS server status is healthy:
3. Verify that the GlusterFS client status is healthy:
4. If any of the above commands fail, refer to the GlusterFS official documentation to troubleshoot the required services.

How can I recover my Glusterfs?

Solution

1. Step 1: Carefully Boot Servers. For now I will assume the servers are offline following a restore.
2. Step 2: Rename the Original Volume Groups.
3. Step 3: Update UUIDs on Restored Bricks.
4. Step 4: Remove LVM Filter.
5. Step 5: Mount Original Bricks.
6. Step 7: Create New Gluster Volume.

Is already part of a volume GlusterFS?

This error normally occurs when traces of metadata and configs are present it the brick you have created. You can execute the following commands to rectify the issue. Note: /path/to/brick refers to the mount path of Glusterfs volume.

How do you increase gluster volume?

To expand a volume:

1. Prepare the new node with the same configuration and storage as all existing nodes in the Gluster trusted storage pool.
2. Add the node to the pool.
3. Add the brick(s), for example: $ gluster volume add-brick myvolume node4:/data/glusterfs/myvolume/mybrick/brick.

How does GlusterFS work?

GlusterFS combines the unused storage space on multiple servers to create a single, large, virtual drive that you can mount like a legacy filesystem – using NFS or FUSE on a client PC. And, you can add more servers or remove existing servers from the storage pool on the fly.

How do you start a gluster volume?

To create a replicated volume Create a trusted storage pool. For example, to create a replicated volume with two storage servers: # gluster volume create test-volume replica 2 transport tcp server1:/exp1 server2:/exp2 Creation of test-volume has been successful Please start the volume to access data.

How do I start gluster daemon?

Starting and Stopping glusterd Manually

1. To start glusterd manually, enter the following command: # /etc/init.d/glusterd start.
2. To stop glusterd manually, enter the following command: # /etc/init.d/glusterd stop.

How do you make gluster volume?

To create a distributed volume Create a trusted storage pool. For example, to create a distributed volume with four storage servers using tcp: # gluster volume create test-volume server1:/exp1 server2:/exp2 server3:/exp3 server4:/exp4 Creation of test-volume has been successful Please start the volume to access data.

Where do I find split brain in Gluster?

Note that, similar to heal info command, for gfid split-brains (same filename but different gfid) their parent directories are listed to be in split-brain. Once the files in split-brain are identified, their resolution can be done from the command line.

Where do I find the healing files in Gluster?

When these commands are invoked, a “glfsheal” process is spawned which reads the entries from / /.glusterfs/indices/xattrop/ directory of all the bricks that are up (that it can connect to) one after another. These entries are GFIDs of files that might need healing.

How to resolve split brain from Mount point?

A set of getfattr and setfattr commands have been provided to detect the data and metadata split-brain status of a file and resolve split-brain, if any, from mount point. Consider a volume “test”, having bricks b0, b1, b2 and b3.

Is there a command for split brain resolution?

Note that entry/gfid split-brain resolution is not supported. Split-brain resolution commands let the user resolve split-brain in 3 ways. This command is useful for per file healing where it is known/decided that the file with bigger size is to be considered as source.