Re: [rdiff-backup-users] Magic increments via LVM snapshots idea

[Joshua N Pritikin]

On Mon, Apr 23, 2007 at 05:19:32PM -0600, Steven Willoughby wrote:
>    I think it is possible to combine rdiff-backup and LVM snapshots to 
> have incremental backups on the same machine without having two full 
> copies of the data set.

It's not even very tricky to set up:

#!/bin/sh

#set -x
set -e

echo "rdiff-backup"

host=leghorn
snapname=/dev/r1vg/homesnap

remove_snapshot() {
  umount $snapname || echo 'unmounted already'
  if lvs $snapname > /dev/null 2>&1 ; then
    lvremove -f $snapname
  fi
}

if  ping -q -c 3 $host > /dev/null; then
  remove_snapshot
  lvcreate -L 2G --snapshot --name homesnap /dev/r1vg/home
  mount $snapname /mnt/home_ro
  ssh $host mount -t ext3 /dev/b1/rdbackup /mnt/rdbackup || echo  'already 
mounted'
  rdiff-backup --print-statistics /mnt/home_ro $host::/mnt/rdbackup/home
  rdiff-backup --force --remove-older-than 1M $host::/mnt/rdbackup/home
  ssh $host umount /mnt/rdbackup
  remove_snapshot
else
  echo "Can't backup to $host; unreachable"
fi