Create lvm partitions from files for testing

start-lvm.sh

#!/bin/bash

# https://help.ubuntu.ru/wiki/lvm

LVM_FILES_PATH=/mnt/lvm
LVM_FILES_SIZE=1G
LVM_PARTS=("first|1G" "second|1G") # array of "name|size"
VG_NAME=vg

set -x

# remove old
for f in "${LVM_PARTS[@]}"
do
	name=$(echo $f | cut -d'|' -f1)
	umount "/dev/$VG_NAME/$name"
	lvremove -f "$VG_NAME/$name"
done

vgremove -f "$VG_NAME"

for f in $(losetup -l | grep "$LVM_FILES_PATH" | cut -d' ' -f1)
do
	pvremove -f "$f"
	losetup -d "$f"
done


# create new
mkdir -p "$LVM_FILES_PATH"

# create files
dd if=/dev/zero of="$LVM_FILES_PATH/d01" count=1 bs=$LVM_FILES_SIZE
dd if=/dev/zero of="$LVM_FILES_PATH/d02" count=1 bs=$LVM_FILES_SIZE
dd if=/dev/zero of="$LVM_FILES_PATH/d03" count=1 bs=$LVM_FILES_SIZE
dd if=/dev/zero of="$LVM_FILES_PATH/d04" count=1 bs=$LVM_FILES_SIZE

# setup loop device
losetup -f --show "$LVM_FILES_PATH/d01" > lvm.tmp
losetup -f --show "$LVM_FILES_PATH/d02" >> lvm.tmp
losetup -f --show "$LVM_FILES_PATH/d03" >> lvm.tmp
losetup -f --show "$LVM_FILES_PATH/d04" >> lvm.tmp

# Initialize physical volume(s) for use by LVM
for f in $(cat lvm.tmp)
do
	pvcreate "$f"
done

# Create a volume group
vgcreate -s 32M "$VG_NAME" $(cat lvm.tmp | tr '\n' ' ')

# Create a logical volume, filesystem and mount
for f in "${LVM_PARTS[@]}"
do
	name=$(echo "$f" | cut -d'|' -f1)
	size=$(echo "$f" | cut -d'|' -f2)
	lvcreate -n "$name" -L $size "$VG_NAME"
	mkfs.ext4 "/dev/$VG_NAME/$name"
	
	mkdir -p "$LVM_FILES_PATH/$name"
	mount "/dev/$VG_NAME/$name" "$LVM_FILES_PATH/$name"
done

rm lvm.tmp