[Solved] You run umount /mnt/backup but get the error "target is busy". What is the most likely cause? — Ans: Some process is using files on /mnt/backup | Linux CLI

Linux CLI - Disk and Storage

You run umount /mnt/backup but get the error "target is busy". What is the most likely cause?

AThe directory /mnt/backup does not exist

BYou typed umount incorrectly

CSome process is using files on /mnt/backup

DThe device is not mounted

Step-by-Step Solution

Solution:

Step 1: Understand 'target is busy' error
This error means the mount point is in use by some process or open file.
Step 2: Identify cause
Processes accessing files or directories on the mount prevent unmounting until they release them.
Final Answer:
Some process is using files on /mnt/backup -> Option C
Quick Check:
Busy target = active process using mount [OK]

Quick Trick: Use lsof or fuser to find processes blocking umount [OK]

Common Mistakes:

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You run umount /mnt/backup but get the error "target is busy". What is the most likely cause?