A server’s root filesystem on LVM is nearly full. The administrator has added a new 20GB disk and created a physical volume on it. They added the PV to the volume group containing root, then extended the root logical volume by 10GB. Next, they ran resize2fs on the mounted root filesystem. After the resize, the server continues to function. However, upon reboot, the system fails to boot and enters emergency mode. What is the most likely cause?