Device-mapper behaviour booting on init=bin/bash

Good morning

Recently we needed to change the password from a redhat 6.5 system that no one knew the root password.

Starting the system with the init=/bin/bash method took us to the following scenario:

system_vg active with only root_lv and tmpfs mounted.

our entries at fstab are like "/dev/mapper/system_vg-root_lv /" kind of thing so the problem came when we tried to mount any other fs cause there were no other objects at /dev/mapper except system_vg-root_lv.

Is there anyway to reload the other lvs into /dev/mapper in order to be able to mount them?

I tried to scan with vgscan and lvscan after changing the lock file for lvm2 to /lock cause the lock file for lvm is located at /var/lock/lvm and that fs did not exist.

Thanks for the help in advance.
Regards

Try this:

# lvm vgscan
# lvm vgchange -a y