🖥️lvm

➡️This is a command-line reference manual for commands and command combinations that you don’t use often enough to remember it. This cheatsheet explains the lvm command with important options and switches using examples.

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#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

#==============================#
# CMD LVM 
#==============================##==============================#
https://thomas-krenn.com/de/wiki/LVM_vergrößern

vgdisplay
lvdisplay
pvdisplay
# LVM's anschauen long

vgs
lgs
pgs
# LVM's anschauen short

lvextend -r --size +10G /dev/vg/opt
# vergrößern mit der option -r resized gleich das filesystem

lvdisplay

swapoff /dev/vg/swap
# swap aus

lvextend -L+1G /dev/vg/swap
mkswap /dev/vg/swap
swapon /dev/vg/swap
# LVM SWAP Vergrössern

pvcreate /dev/sdb /dev/sdc /dev/sdd
# To create physical volumes on top of /dev/sdb, /dev/sdc, and /dev/sdd

lvcreate -n vol_projects -L 10G vg00
# The -n option is used to indicate a name for the LV, whereas -L sets a fixed size and -l (lowercase L) is used to indicate a percentage of the remaining space in the container VG.

mkfs.ext4 /dev/vg00/vol_projects
# create a filesystem on top of it

lvreduce -L -2.5G -r /dev/vg00/vol_projects
# resizing each filesystem

lvextend -l +100%FREE -r /dev/vg00/vol_backups
# resizing each filesystem

vgextend vg00 /dev/sdd
# Adding the remaining PV from our initial setup (/dev/sdd).

blkid /dev/vg00/vol_projects
# to find out what its UUID (a non-changing attribute that uniquely identifies a formatted storage device) is

#==============================##==============================#
# CMD LVM						       #
#==============================##==============================#

Cheatsheets are an excellent complement to other information sources like Linux man-pages, Linux help, or How-To’s and tutorials, as they provide compact and easily accessible information. While man-pages and detailed tutorials often contain comprehensive explanations and extensive guides, cheatsheets summarize the most important options forthe command lvm in a clear format. This allows users to quickly access the needed information for lvm without having to sift through lengthy texts. Especially in stressful situations or for recurring tasks, cheatsheets for lvm are a valuable resource to work efficiently and purposefully.

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