We use install RHEL 6 or 7 in one Volume Group (VG), named “rootvg”, usually only in one LUN o Physical Volume. So this guide supposes that you have installed your OS on rhel VG and your app on db2vg VG, named “appvg”.
We faced a problem, if you make a snapshot of a machine with large data, the snapshot can took two days to get merged, production environment can allowed that behavior.
The plan is take only the rootvg for the snapshot or use dd to make a backup only of rootvg
We will cover three scenarios over VM machines:
[root@localhost ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert db2lv db2vg -wi-ao---- 9.00g root rhel -wi-ao---- 7.09g swap rhel -wi-ao---- 924.00m
We will cover only the steps of make a snapshot, but you must have knowledge about remove disk temporary. The steps are:
virsh connect qemu:///system snapshot-create-as --domain rhel7.4-db2-pruebalun --name "rhel7.4-db2-pruebalun-snapshot-hoy" snapshot-list rhel7.4-db2-pruebalun snapshot-info --current rhel7.4-db2-pruebalun
virsh connect qemu:///system snapshot-revert --domain rhel7.4-db2-pruebalun --snapshotname rhel7.4-db2-pruebalun-snapshot-hoy --running
virsh connect qemu:/system snapshot-delete –domain rhel7.4-db2-pruebalun –snapshotname rhel7.4-db2-pruebalun-snapshot-hoy </code>