For testing purpose I need to simulate a crash of the disk (by detaching it) while other processes are using it.
umount -f /srv/node/d1/
It doesn't want to unmount it. It shows me the next message:
umount: /srv/node/d1: target is busy. (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1))
There several processes which I don't want to stop manually because it will not be a crash. Does somebody know how to just detach a disk in linux? It would be more easy to detach it physically but I am using a virtual machine with virtual disks.