Update ganeti

howto/ganeti.md

@@ -141,7 +141,20 @@ of the underlying device:
 The number `0` in this context, indicates the first disk of the
 instance. Then the filesystem needs to be resized inside the VM:
 
-    ssh root@test1.torproject.org resize2fs /dev/sda1
+    ssh root@test1.torproject.org 
+
+Use lvs to display information about logical volumes:
+
+    # lvs
+    LV            VG               Attr       LSize    Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
+    var-opt       vg_test-01     -wi-ao---- <10.00g                                                    
+    test-backup vg_test-01_hdd   -wi-ao---- <20.00g            
+
+Use lvextend to add space to the volume:
+    # lvextend -l '+100%FREE' vg_test-01/var-opt
+
+Finally resize the filesystem with:
+    # resize2fs /dev/vg_test-01/var-opt
 
 ### Adding disks