diff --git a/full/src/main/java/de/ids_mannheim/korap/config/NamedVCLoader.java b/full/src/main/java/de/ids_mannheim/korap/config/NamedVCLoader.java
index 014a057..eaa462e 100644
--- a/full/src/main/java/de/ids_mannheim/korap/config/NamedVCLoader.java
+++ b/full/src/main/java/de/ids_mannheim/korap/config/NamedVCLoader.java
@@ -137,13 +137,14 @@
 
     private void cacheVC (String json, String filename)
             throws IOException, QueryException {
+        config.setVcInCaching(filename);
         long start, end;
         start = System.currentTimeMillis();
 
         KrillCollection collection = new KrillCollection(json);
         collection.setIndex(searchKrill.getIndex());
 
-        jlog.info("Store {} in cache ", filename);
+        jlog.info("Storing {} in cache ", filename);
         if (collection != null) {
             collection.storeInCache(filename);
         }
@@ -153,5 +154,6 @@
             jlog.debug("memory cache: "
                     + KrillCollection.cache.calculateInMemorySize());
         }
+        config.setVcInCaching("");
     }
 }
diff --git a/full/src/main/java/de/ids_mannheim/korap/rewrite/VirtualCorpusRewrite.java b/full/src/main/java/de/ids_mannheim/korap/rewrite/VirtualCorpusRewrite.java
index 39c76d4..3f25da1 100644
--- a/full/src/main/java/de/ids_mannheim/korap/rewrite/VirtualCorpusRewrite.java
+++ b/full/src/main/java/de/ids_mannheim/korap/rewrite/VirtualCorpusRewrite.java
@@ -26,6 +26,8 @@
 public class VirtualCorpusRewrite implements RewriteTask.RewriteQuery {
 
     @Autowired
+    private KustvaktConfiguration config;
+    @Autowired
     private VirtualCorpusService vcService;
 
     @Override
@@ -59,6 +61,15 @@
                     }
                 }
 
+                String vcInCaching = config.getVcInCaching();
+                if (vcName.equals(vcInCaching)) {
+                    throw new KustvaktException(
+                            de.ids_mannheim.korap.exceptions.StatusCodes.CACHING_VC,
+                            "VC is currently busy and unaccessible due to "
+                                    + "caching process",
+                            koralNode.get("ref"));
+                }
+                
                 VirtualCorpus vc =
                         vcService.searchVCByName(username, vcName, vcOwner);
                 if (!vc.isCached()) {
diff --git a/full/src/main/resources/ehcache.xml b/full/src/main/resources/ehcache.xml
index cc06d48..da9acda 100644
--- a/full/src/main/resources/ehcache.xml
+++ b/full/src/main/resources/ehcache.xml
@@ -59,6 +59,6 @@
 		maxBytesLocalDisk="1G"
 		diskExpiryThreadIntervalSeconds = "120" > 
 		<persistence strategy="localTempSwap"/>
-		<sizeOfPolicy maxDepth="1000" maxDepthExceededBehavior="abort" />
+		<sizeOfPolicy maxDepth="2000" maxDepthExceededBehavior="abort" />
 	</cache>        
 </ehcache>