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The symptoms are as follows: The mount directory was deleted, but the umount operation was not performed in advance.

Solution:

Check whether mount directories exist in the /etc/fstab file and run the umount -l command to unmount invalid mount directories.

[root@mes-rac01 soft]# umount -l /backup
 
# # umount - l interpretation
-l, --lazy              detach the filesystem now, and cleanup all later
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Test DF-H, recovered!

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