A Linux administrator needs to remove a USB drive from a system. The unmount command fails, stating the device is busy. Which of the following commands will show the reason for this error?

The correct answer is D. lsof | grep /mnt/usb. Kill the processes using the filesystem and then unmount it. The following command finds out the processes accessing the partition/filesystem. You need to run the following command as root. Here, we use the mount point /mnt/data as an example. # lsof | grep '/mnt/data' It will ou

Troubleshooting and Diagnostics

Question

Options

Alsusb | grep /mnt/usb
Bmount | grep /mnt/usb
Cps aux | grep /mnt/usb
Dlsof | grep /mnt/usb

How the community answered

(26 responses)

A
4% (1)
B
4% (1)
C
12% (3)
D
81% (21)

Explanation

Kill the processes using the filesystem and then unmount it. The following command finds out the processes accessing the partition/filesystem. You need to run the following command as root. Here, we use the mount point /mnt/data as an example. # lsof | grep '/mnt/data' It will output lines like bash 17622 user1 cwd DIR 253,2 4096 2 /mnt/data If you are sure that it is safe to kill the process, you may kill them by kill or kill -9. After the processes are killed, the filesystem will be able to be unmounted.

Topics

#lsof#busy device#USB unmount#open files

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