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Some time ago I created my first GFS2 to do tests:

mkfs.gfs2 -t cluster-test:gfs-vol1 -p lock_dlm -j 3 /dev/vg2/gfs-vol1

From mkfs.gfs2(8) man:

-t clustername:lockspace

The "lock table" pair used to uniquely identify this filesystem in a cluster. The cluster name segment (maximum 32 characters) must match the name given to your cluster in its configuration; only members of this cluster are permitted to use this file system. The lockspace segment (maximum 30 characters) is a unique file system name used distinguish this gfs2 file system. Valid clusternames and lockspaces may only contain alphanumeric characters, hyphens (-) and underscores (_).

After testing I want to change the name of the cluster from cluster-test to cluster-prod. First I changed the configuration of totem (cluster_name) in corosync.conf, but after that mount failed.

mount: /gfs/gfs-vol1: mount(2) system call failed: Invalid request descriptor.

In dmesg:

kernel: gfs2: fsid=cluster-test:gfs-vol1: Trying to join cluster "lock_dlm", "cluster-test:gfs-vol1"
kernel: dlm: Using TCP for communications
kernel: dlm: dlm cluster name 'cluster-prod' does not match the application cluster name 'cluster-test'
kernel: gfs2: fsid=cluster-test:gfs-vol1: dlm_new_lockspace error -53

How to change the GFS2 clustername in filesystem to match dlm/corosync?

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The change is easy (if you already know where to look; not was my case). Two different ways:

Hardway (my first guess):

gfs2_edit -p sb field sb_locktable cluster-prod:gfs-vol1 /dev/vg2/gfs-vol1

Easyway (although not very obvious/intuitive if you don't know tunegfs2 command and relation between "locktable name" and "filesystem label"):

tunegfs2 -L cluster-prod:gfs-vol1 /dev/vg2/gfs-vol1

This is also useful if you want to change the "lockproto"

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