09-13-2014
run the following
pvscan
vgscan
lvscan
vgs
lvs
pvs
See what that shows. If all else fails you can look at running a vgcfgbackup and vgcfgrestore with choose the config in /etc/lvm that is good. The tree looks like this.
ls -R /etc/lvm
/etc/lvm:
archive backup cache lvm.conf
/etc/lvm/archive:
vg_root_00000-1774443783.vg
/etc/lvm/backup:
vg_root
/etc/lvm/cache:
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LEARN ABOUT CENTOS
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(8) 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.
--cache
Scan devices for LVM physical volumes and volume groups and instruct the lvmetad daemon to update its cached state accordingly.
SEE ALSO
lvm(8), vgcreate(8), vgchange(8)
Sistina Software UK LVM TOOLS 2.02.105(2)-RHEL7 (2014-03-26) VGSCAN(8)