explain online and offline migration

Signed-off-by: Dominik Csapak <d.csa...@proxmox.com>
 qm.adoc | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/qm.adoc b/qm.adoc
index b9b7ca1..c133f7b 100644
--- a/qm.adoc
+++ b/qm.adoc
@@ -512,6 +512,22 @@ Same as above, but only wait for 40 seconds.
  qm shutdown 300 && qm wait 300 -timeout 40
+If you have a cluster, you can migrate your VM to another host with
+ qm migrate <vmid> <target>
+When your VM is running and it has no local resources defined (such as disks
+on local storage, passed through devices, etc.) you can initiate a live
+migration with the -online flag.
+If you have local resources, you can still offline migrate your VMs,
+as long as all disk are on storages, which are defined on both hosts.
+Then the migration will copy the disk over the network to the target host.

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