You may face the following error on many Operation System not only on AIX :
superblock is invalid : -5
this error means that you apply function of File system type on another type, in another meaning,
if you have file system “/TestFs” with type “jfs” and you run some commands which works with “jfs2” or “NFS” you will face the previous error.
so while you see this error , try to check your File System Type.
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