Add volumes/migrate-storage.md

volumes/migrate-storage.md

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+# Migrate VM or LXC from one volume to another
+
+If you messed up and placed your VM or LXC on the wrong storage type, this will help for migrating to the correct storage.
+
+---
+## LXC volume migration
+
+For the sake of this example, we are using LXC vmid 205.
+
+Find the available storage name you want to migrate to first:
+```
+pvesm status
+```
+
+Verify the name of the current volume the LXC is contained on:
+```
+pct config 205 | grep rootfs
+````
+
+The output of my available volumes:
+```
+root@pve:~# pvesm status
+Name             Type     Status           Total            Used       Available        %
+images            dir     active       121203372        93525632        21474812   77.16%
+iso               dir     active        40195344        20347016        17774320   50.62%
+local             dir     active        40195344        20347016        17774320   50.62%
+local-lvm     lvmthin     active        55832576               0        55832576    0.00%
+nvme          lvmthin     active      3873329152      1028756222      2844572929   26.56%
+pi2              cifs     active     13563452384      1357229972     12206222412   10.01%
+smb              cifs     active      6188571648       860594176      5327977472   13.91%
+```
+
+Once you verify the lvmthin volume, in this case `nvme`, begin the migration:
+
+```
+pct shutdown 205
+pct move-volume 205 rootfs nvme
+pct start 205
+```
+
+1. Shutdown the container
+2. Move the container volume to the new lvmthin storage device
+3. Start the container