When a filesystem is protected against concurrent mounting, and a second mount attempt is made you will see this error:

# lsfs -q /mountpoint
Name            Nodename   Mount Pt               VFS   Size    Options    Auto Accounting
/dev/fslv34     --         /mountpoint            jfs2  4194304 rw         no   no
  (lv size: 4194304, fs size: 4194304, block size: 4096, sparse files: yes, inline log: no, inline log size: 0, EAformat: v1, Quota: no, DMAPI: no, VIX: yes, EFS: no, ISNAPSHOT: no, MAXEXT: 0, MountGuard: yes)

# mount /mountpoint
mount: /dev/fslv34 on /mountpoint:
Cannot mount guarded filesystem.
The filesystem is potentially mounted on another node

After a system crash the filesystem may still have mount flags enabled and refuse to be mounted. In this case the guard state can be temporarily overridden by the “noguard” option to the mount command:

# mount -o noguard /mountpoint
mount: /dev/fslv34 on /mountpoint:
Mount guard override for filesystem.
The filesystem is potentially mounted on another node.

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