diff --git a/check_eva/check_eva.py b/check_eva/check_eva.py
index 43b89ea..d206f41 100644
--- a/check_eva/check_eva.py
+++ b/check_eva/check_eva.py
@@ -497,6 +497,7 @@ def check_generic(command="ls disk full", namefield="objectname", perfdata_field
     usedstoragespacegb = 0
     occupancyalarmlvel = 0
     warninggb = 0
+    gooddisks = 0
     for i in objects:
         systemname = i['systemname']
         # Some versions of commandview use "objectname" instead of namefield
@@ -528,6 +529,12 @@ def check_generic(command="ls disk full", namefield="objectname", perfdata_field
             add_perfdata("'%s%s'=%s " %
                          (identifier, field, i.get(field, None)))
 
+        # Count disks with operationalstate good
+        if command == "ls disk full":
+            if i['operationalstate'] == 'good':
+                gooddisks += 1
+                perfdata = "'Good Disks'=" + str(gooddisks)
+
         # Disk group gets a special perfdata treatment
         if command == "ls disk_group full":
             totalstoragespacegb = float(i['totalstoragespacegb'])