Solve the problem of busy devices in Linux

When managing umount devices in Linux, you often encounter "device is busy". If umount a file system encounters this situation, and you are not in the directory to be unmounted. Then there is probably a user or process using that directory.

# umount /mnt

umount: /mnt: device is busy

umount: /mnt: device is busy

Then you must use the fuser command to view the process ID and owner of the process, such as:

# fuser -mu /mnt

/mnt: 25781c(root)

# kill -9 25781

# umount /mnt

In this case, it means that the rhythmbox user is using that directory. Then you can also use fuser -ck /dev/sdc1 to kill the process.

# fuser -m /dev/sdc1

/dev/sdc1: 538

# ps auxw|grep 538

donncha 538 0.4 2.7 219212 56792 SLl Feb11 11:25 rhythmbox

If all these efforts still don't work, after killing the process, you may need to add -f -l parameters at this time to force uninstall

# umount -f -l /mnt

NOTE:

You can use the following command to check the bad blocks of the SATA hard disk.

# badblocks -v /dev/sda

# badblocks -v /dev/sdb

# badblocks -v /dev/mapper/vgosi-lvol1

Checking blocks 0 to 10477568

Checking for bad blocks (read-only test): done

Pass completed, 0 bad blocks found.

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