LVM Snapshot Backup - Takes a snapshot of each logical volume in a volume group and creates a compressed dd copy in a specific directory.

lvm_backup.sh

#!/bin/bash

VG_NAME="vg0"
SNAPSHOT_SIZE="+2G"
BACKUP_LOCATION="/backups"
DAYSTOKEEP=7

for lv in $(lvs --noheadings --nosuffix --aligned --separator , -o lv_name,lv_attr | grep -v ,s | cut -d, -f1)
   do
        LV_SIZE="$(lvs --units m --noheadings --nosuffix --aligned --separator , -o lv_name,lv_size | grep "$lv" | cut -d',' -f2 | cut -d. -f 1)" # LV size in MB
        LV_UUID="$(lvs --units m --noheadings --nosuffix --aligned --separator , -o lv_name,lv_uuid | grep "$lv" | cut -d',' -f2)" # LV UUID
        LV_SNAPNAME="SNAP_$(basename "$lv")" # LV snapshot name
        echo "LVM Logical Volume: $lv"
        echo "Size: $LV_SIZE MB"
        echo "UUID: $LV_UUID"
        echo "Snapshot name: $LV_SNAPNAME"
        echo "Removing old snapshot (if any)."
        lvremove -f "/dev/$VG_NAME/$LV_SNAPNAME"
        echo "Creating snapshot /dev/$VG_NAME/$LV_SNAPNAME"
        lvcreate -L"$SNAPSHOT_SIZE" --snapshot -n"$LV_SNAPNAME" "/dev/$VG_NAME/$lv"
        sleep 4
        echo "Backing up snapshot to $BACKUP_LOCATION/$LV_SNAPNAME-$(date "+%Y.%m.%d-%H.%M.%S").lv.gz"
        dd if="/dev/$VG_NAME/$LV_SNAPNAME" bs=512k of=/dev/stdout | pv -pterbW -i 2 --buffer-size 512k --size "$LV_SIZE"m | /usr/bin/pigz -9 -b 256 > "$BACKUP_LOCATION/$LV_SNAPNAME-$(date "+%Y.%m.%d-%H.%M.%S").lv.gz"
        echo "Removing snapshot /dev/$VG_NAME/$LV_SNAPNAME"
        lvremove -f "/dev/$VG_NAME/$LV_SNAPNAME"
        echo "Removing old backups"
        find "$BACKUP_LOCATION/$LV_SNAPNAME-*.lv.gz" -mtime +$DAYSTOKEEP -print -delete
        echo "--"
done