diff --git a/htools/Ganeti/HTools/QC.hs b/htools/Ganeti/HTools/QC.hs
index e4cd394d02f05b7d7a301015e68c26fac7b186b9..31b745bf8847b4b3ef5eb025147b3eabfe1f4ed4 100644
--- a/htools/Ganeti/HTools/QC.hs
+++ b/htools/Ganeti/HTools/QC.hs
@@ -754,11 +754,12 @@ testSuite "Instance"
 
 prop_Text_Load_Instance name mem dsk vcpus status
                         (NonEmpty pnode) snode
-                        (NonNegative pdx) (NonNegative sdx) autobal dt =
+                        (NonNegative pdx) (NonNegative sdx) autobal dt su =
   pnode /= snode && pdx /= sdx ==>
   let vcpus_s = show vcpus
       dsk_s = show dsk
       mem_s = show mem
+      su_s = show su
       status_s = Types.instanceStatusToRaw status
       ndx = if null snode
               then [(pnode, pdx)]
@@ -769,7 +770,7 @@ prop_Text_Load_Instance name mem dsk vcpus status
       sdt = Types.diskTemplateToRaw dt
       inst = Text.loadInst nl
              [name, mem_s, dsk_s, vcpus_s, status_s,
-              sbal, pnode, snode, sdt, tags]
+              sbal, pnode, snode, sdt, tags, su_s]
       fail1 = Text.loadInst nl
               [name, mem_s, dsk_s, vcpus_s, status_s,
                sbal, pnode, pnode, tags]
@@ -789,10 +790,11 @@ prop_Text_Load_Instance name mem dsk vcpus status
                                       then Node.noSecondary
                                       else sdx) &&
                Instance.autoBalance i == autobal &&
+               Instance.spindleUsage i == su &&
                Types.isBad fail1
 
 prop_Text_Load_InstanceFail ktn fields =
-  length fields /= 10 ==>
+  length fields /= 10 && length fields /= 11 ==>
     case Text.loadInst nl fields of
       Types.Ok _ -> failTest "Managed to load instance from invalid data"
       Types.Bad msg -> printTestCase ("Unrecognised error message: " ++ msg) $
diff --git a/htools/Ganeti/HTools/Text.hs b/htools/Ganeti/HTools/Text.hs
index fc943e996eb9bf60a5ae6bda5b856703c5fcb3f4..957758cb4352d83d9941ab7876c34f21665744d8 100644
--- a/htools/Ganeti/HTools/Text.hs
+++ b/htools/Ganeti/HTools/Text.hs
@@ -102,12 +102,12 @@ serializeInstance nl inst =
       snode = (if sidx == Node.noSecondary
                  then ""
                  else Container.nameOf nl sidx)
-  in printf "%s|%d|%d|%d|%s|%s|%s|%s|%s|%s"
+  in printf "%s|%d|%d|%d|%s|%s|%s|%s|%s|%s|%d"
        iname (Instance.mem inst) (Instance.dsk inst)
        (Instance.vcpus inst) (instanceStatusToRaw (Instance.runSt inst))
        (if Instance.autoBalance inst then "Y" else "N")
        pnode snode (diskTemplateToRaw (Instance.diskTemplate inst))
-       (intercalate "," (Instance.tags inst))
+       (intercalate "," (Instance.tags inst)) (Instance.spindleUsage inst)
 
 -- | Generate instance file data from instance objects.
 serializeInstances :: Node.List -> Instance.List -> String
@@ -206,7 +206,7 @@ loadInst :: NameAssoc -- ^ Association list with the current nodes
                                                -- instance name and
                                                -- the instance object
 loadInst ktn [ name, mem, dsk, vcpus, status, auto_bal, pnode, snode
-             , dt, tags ] = do
+             , dt, tags, su ] = do
   pidx <- lookupNode ktn name pnode
   sidx <- if null snode
             then return Node.noSecondary
@@ -222,12 +222,18 @@ loadInst ktn [ name, mem, dsk, vcpus, status, auto_bal, pnode, snode
                          "' for instance " ++ name
   disk_template <- annotateResult ("Instance " ++ name)
                    (diskTemplateFromRaw dt)
+  spindle_usage <- tryRead name su
   when (sidx == pidx) $ fail $ "Instance " ++ name ++
            " has same primary and secondary node - " ++ pnode
   let vtags = commaSplit tags
       newinst = Instance.create name vmem vdsk vvcpus vstatus vtags
-                auto_balance pidx sidx disk_template 1
+                auto_balance pidx sidx disk_template spindle_usage
   return (name, newinst)
+
+loadInst ktn [ name, mem, dsk, vcpus, status, auto_bal, pnode, snode
+             , dt, tags ] = loadInst ktn [ name, mem, dsk, vcpus, status,
+                                           auto_bal, pnode, snode, dt, tags,
+                                           "1" ]
 loadInst _ s = fail $ "Invalid/incomplete instance data: '" ++ show s ++ "'"
 
 -- | Loads a spec from a field list.