LVM HOWTO

LVM HOWTO
Setup Flexible Disk Storage with Logical Volume Management (LVM) in Linux – PART 1
How to Extend/Reduce LVM’s (Logical Volume Management) in Linux – Part II
How to Take ‘Snapshot of Logical Volume and Restore’ in LVM – Part III
Создание lvm snapshot и восстановление из него
13.4. Taking a Backup Using Snapshots
Создание lvm снапшота и восстановление из него.

Стенд pg 9.6.15 pg_probackup

$ sudo su postgres -c "createdb --username postgres -T template0 demo"
$ time sudo su postgres -c "pg_restore -d demo -j 4 /home/user/demo.dump"

$ df -h

$ sudo pg_ctlcluster 9.6 main stop

$ sudo lvs
 

$ sudo lvcreate --size 500G --snapshot --name lv_snap /dev/vg/lv

$ sudo pg_ctlcluster 9.6 main start

$ sudo lvs

 
$ sudo mkdir /lv_snap

$ sudo lvscan
  ACTIVE   Original '/dev/vg/lv' [953,67 GiB] inherit
  ACTIVE   Snapshot '/dev/vg/lv_snap' [500,00 GiB] inherit

$ sudo mount /dev/vg/lv_snap /lv_snap

$ sudo mkdir -p /backup/main
$ sudo chown -R postgres:postgres /backup/main
$ sudo su postgres -c "cd /lv_snap/9.6/main ; cp -r *  /backup/main"
$ sudo umount /lv_snap
$ sudo lvremove /dev/vg/lv_snap
Do you really want to remove and DISCARD active logical volume vg/lv_snap? [y/n]: y
  Logical volume "lv_snap" successfully removed