Differences

This shows you the differences between two versions of the page.

--- soft:lvm [2019/07/14 14:04]
phil created
+++ soft:lvm [2019/10/11 10:16] (current)
phil
@@ Line 1: / Line 1: @@
 ====== LVM - Logical volume manager ======
+  * https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/logical_volume_manager_administration/index
+  * https://wiki.archlinux.org/index.php/LVM
+  * https://wiki.gentoo.org/wiki/LVM
+  * List Physical Volumes: ''pvs''
+  * List Volume Groups: ''vgs''
+  * List Volumes: ''lvs''
+<code>
+pvcreate /dev/sdX
+vgcreate vg0 /dev/sdX
+</code>
+===== Thin volumes =====
+It's better to use thin provisioned volumes to have snapshots comes for free (copy on write) and are better for SSDs
+Thin provisioned volumes are created from a "pool".
+<code>
+lvcreate -L 100G --thin vg/thin
+</code>
+Then create volume within the pool:
+<code>
+lvcreate -n myvol -T vg/thin -V 10G
+</code>
+Then to take a snapshot:
+<code>
+lvcreate -kn -n myvol_snap -s vg/myvol
+</code>
+To restore the snapshot
+<code>
+lvremove vg/myvol
+lvrename vg/myvol_snap vg/myvol
+</code>
+==== Non-Thin volumes ====
+Create a volume:
+<code>
+lvcreate -L10G -n myvol vg
+</code>
+Take a snapshot, you **MUST** give a size here, the diff between snapshot and original volume will be stored here. In case of this space being consumed, the snapshot is corrupted :/
+<code>
+lvcreate -L2G -s -n myvol_snap vg/myvol
+</code>
+To restore the snapshot
+<code>
+lvconvert --merge vg/myvol_snap
+</code>
+=== Backup using lvm snapshots ===
+  * [[soft:burp|script for BURP backup program]]
+  * http://ed.zehome.com/2018/sauvegarde-lvm-simple-partie-2/ backup block device limiting impact on CPU and disk I/O

philpep's wiki

User Tools

Site Tools

Differences

Page Tools