expand on export procedure, not working (tpo/tpa/team#40897)

howto/ganeti.md

@@ -2063,10 +2063,10 @@ VMs one at a time, if only a subset of the cluster needs to be
 evacuated.
 
  1. find nodes to host the exported VM on the source cluster and the
-    target cluster; it needs enough disk space in `/srv/ganeti` to
+    target cluster; it needs enough disk space in `/var/lib/ganeti/export` to
     keep a copy of a snapshot of the VM:
 
-        df -h /srv/ganeti
+        df -h /var/lib/ganeti/export
 
  2. have the right kernel modules loaded, which might require a
     reboot of the source node:
@@ -2080,10 +2080,14 @@ evacuated.
 
         gnt-backup export -n fsn-node-01.torproject.org test-01.torproject.org
 
+    WARNING: this step is currently not working if there's a second
+    disk (or swap device? to be confirmed, see
+    https://github.com/ganeti/instance-debootstrap/issues/18
+
  4. copy the VM snapshot from the source node to node in the target
     cluster:
 
-        scp /srv/ganeti/... root@chi-node-02.torproject.org:/srv/ganeti
+        rsync -a /var/lib/ganeti/export/test-01.torproject.org/ root@chi-node-02.torproject.org:/srv/ganeti/test-01.torproject.org/
 
  5. on the master of the target Ganeti cluster, import the VM: