lvm.md

Logical Volume Manager

Status

# List physical volumes
pvs

# List volume groups and sizes
vgs

# List logival volumes
lvs

Create a volume group

lvcreate -L 4G -n <lv> <vg>

# format /dev/<vg>/<lv>, eg:
mkfs.<fs> /dev/<vg>/<lv>
# mount
mkdir -p <dir>
mount /dev/<vg>/<lv> <dir>
# add to fstab
echo "/dev/mapper/<vg>-<lv> <dir> <fs> defaults 1 1 >> /etc/fstab

Extend a volume group

# resize in byte units
lvextend -L +1G <lv>

# resize relative to size
lvextend -l 80%FREE

# resize file system
lvextend -L +10G /dev/internvg/root
resize2fs /dev/internvg/root

Don't know what this is, but I had it pasted for some reason..

Exclusive Activation of a Volume Group in a Cluster 
Link --> https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/High_Availability_Add-On_Administration/s1-exclusiveactive-HAAA.html 
1> vgs --noheadings -o vg_name
2> volume_list = [ "rhel_root", "rhel_home" ]
3> dracut -H -f /boot/initramfs-$(uname -r).img $(uname -r)
4> Reboot the node
5> uname -r to verify the correct initrd image