How to unmount the backup partition when it’s locked

Posted on: February 02, 2015

There is a known issue with cloudlinux running on centOS  5.x where after a backup is made or a restore has been run, the backup partition will lock, and will not allow you to unmount it.  The error looks similar to this:

[backupmount] Cannot umount: /backup. This mountpoint is still in use and has an active lock
mount: /dev/sda1 already mounted or /backup busymount: according to mtab, /dev/sda1 is already mounted on /backup

To unmount the partition, run the following 3 commands:

mount -r /backup
mount -o remount,rw /backup
umount /backup

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