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Full Discussion: Device-mapper behaviour booting on init=bin/bash
Operating Systems Linux Red Hat Device-mapper behaviour booting on init=bin/bash Post 302913653 by Ikaro0 on Tuesday 19th of August 2014 05:22:47 AM
Old 08-19-2014
Wrench 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
 

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LEARN ABOUT MOJAVE

vgscan

VGSCAN(8)                                                     System Manager's Manual                                                    VGSCAN(8)

NAME

       vgscan - scan all disks for volume groups and rebuild caches

SYNOPSIS

       vgscan [-d|--debug] [-h|-?|--help] [--ignorelockingfailure] [--mknodes] [-P|--partial] [-v|--verbose]

DESCRIPTION

       vgscan  scans all SCSI, (E)IDE disks, multiple devices and a bunch of other disk devices in the system looking for LVM physical volumes and
       volume groups.  Define a filter in lvm.conf(5) to restrict the scan to avoid a CD ROM, for example.

       In LVM2, vgscans take place automatically; but you might still need to run one explicitly after changing hardware.

OPTIONS

       See lvm for common options.

       --mknodes
              Also checks the LVM special files in /dev that are needed for active logical volumes and creates any missing ones and removes unused
              ones.

SEE ALSO

       lvm(8), vgcreate(8), vgchange(8)

Sistina Software UK                                      LVM TOOLS 2.02.95(2) (2012-03-06)                                               VGSCAN(8)
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