The mmlsmount command

The mmlsmount command lists the nodes that have a given GPFS file system mounted.

Use the -L option to see the node name and IP address of each node that has the file system in use. This command can be used for all file systems, all remotely mounted file systems, or file systems mounted on nodes of certain clusters.

While not specifically intended as a service aid, the mmlsmount command is useful in these situations:
  1. When writing and debugging new file system administrative procedures, to determine which nodes have a file system mounted and which do not.
  2. When mounting a file system on multiple nodes, to determine which nodes have successfully completed the mount and which have not.
  3. When a file system is mounted, but appears to be inaccessible to some nodes but accessible to others, to determine the extent of the problem.
  4. When a normal (not force) unmount has not completed, to determine the affected nodes.
  5. When a file system has force unmounted on some nodes but not others, to determine the affected nodes.
For example, to list the nodes having all file systems mounted: 
mmlsmount all -L
The system displays output similar to:
File system fs2 is mounted on 7 nodes:
  192.168.3.53    c25m3n12                  c34.cluster
  192.168.110.73  c34f2n01                  c34.cluster
  192.168.110.74  c34f2n02                  c34.cluster
  192.168.148.77  c12c4apv7                 c34.cluster
  192.168.132.123 c20m2n03                  c34.cluster               (internal mount)
  192.168.115.28  js21n92                   c34.cluster               (internal mount)
  192.168.3.124   c3m3n14                   c3.cluster

File system fs3 is not mounted.

File system fs3 (c3.cluster:fs3) is mounted on 7 nodes:
  192.168.2.11    c2m3n01                   c3.cluster
  192.168.2.12    c2m3n02                   c3.cluster
  192.168.2.13    c2m3n03                   c3.cluster
  192.168.3.123   c3m3n13                   c3.cluster
  192.168.3.124   c3m3n14                   c3.cluster
  192.168.110.74  c34f2n02                  c34.cluster
  192.168.80.20   c21f1n10                  c21.cluster

For more information on the mmlsmount command, see mmlsmount command.