diff --git a/storage/ndb/src/kernel/blocks/backup/Backup.cpp b/storage/ndb/src/kernel/blocks/backup/Backup.cpp
index ec7b3f42374..5cc486ff83b 100644
--- a/storage/ndb/src/kernel/blocks/backup/Backup.cpp
+++ b/storage/ndb/src/kernel/blocks/backup/Backup.cpp
@@ -326,16 +326,18 @@ Backup::execCONTINUEB(Signal* signal)
     ptr.p->files.getPtr(filePtr, ptr.p->ctlFilePtr);
     FsBuffer & buf = filePtr.p->operation.dataBuffer;
     
-    if(buf.getFreeSize() + buf.getMinRead() < buf.getUsableSize()) {
+    if(buf.getFreeSize() < buf.getMaxWrite()) {
       jam();
       TablePtr tabPtr LINT_SET_PTR;
       c_tablePool.getPtr(tabPtr, Tdata2);
       
-      DEBUG_OUT("Backup - Buffer full - " << buf.getFreeSize()
-		<< " + " << buf.getMinRead()
-		<< " < " << buf.getUsableSize()
-		<< " - tableId = " << tabPtr.p->tableId);
-
+      DEBUG_OUT("Backup - Buffer full - " 
+                << buf.getFreeSize()
+		<< " < " << buf.getMaxWrite()
+                << " (sz: " << buf.getUsableSize()
+                << " getMinRead: " << buf.getMinRead()
+		<< ") - tableId = " << tabPtr.p->tableId);
+      
       signal->theData[0] = BackupContinueB::BUFFER_FULL_META;
       signal->theData[1] = Tdata1;
       signal->theData[2] = Tdata2;
diff --git a/storage/ndb/src/kernel/blocks/backup/Backup.hpp b/storage/ndb/src/kernel/blocks/backup/Backup.hpp
index 3fd9b2967fd..ad6e3b8fadc 100644
--- a/storage/ndb/src/kernel/blocks/backup/Backup.hpp
+++ b/storage/ndb/src/kernel/blocks/backup/Backup.hpp
@@ -557,8 +557,8 @@ public:
   NDB_TICKS m_reset_disk_speed_time;
   static const int  DISK_SPEED_CHECK_DELAY = 100;
   
-  STATIC_CONST(NO_OF_PAGES_META_FILE =
-               (MAX_WORDS_META_FILE + BACKUP_WORDS_PER_PAGE - 1) /
+  STATIC_CONST(NO_OF_PAGES_META_FILE = 
+	       (2*MAX_WORDS_META_FILE + BACKUP_WORDS_PER_PAGE - 1) / 
 	       BACKUP_WORDS_PER_PAGE);
 
   /**
diff --git a/storage/ndb/src/kernel/vm/DLHashTable.hpp b/storage/ndb/src/kernel/vm/DLHashTable.hpp
index df56dcb8846..b9d5f7c597f 100644
--- a/storage/ndb/src/kernel/vm/DLHashTable.hpp
+++ b/storage/ndb/src/kernel/vm/DLHashTable.hpp
@@ -46,8 +46,8 @@ public:
   /**
    * Seize element from pool - return i
    *
-   * Note must be either added using <b>add</b> or released 
-   * using <b>release</b>
+   * Note *must* be added using <b>add</b> (even before hash.release)
+   *             or be released using pool
    */
   bool seize(Ptr<T> &);
 
@@ -360,7 +360,14 @@ DLHashTableImpl<P, T, U>::remove(Ptr<T> & ptr)
   else 
   {
     const Uint32 hv = ptr.p->hashValue() & mask;  
-    hashValues[hv] = next;
+    if (hashValues[hv] == ptr.i)
+    {
+      hashValues[hv] = next;
+    }
+    else
+    {
+      // Will add assert in 5.1
+    }
   }
   
   if(next != RNIL)
@@ -386,7 +393,14 @@ DLHashTableImpl<P, T, U>::release(Ptr<T> & ptr)
   else 
   {
     const Uint32 hv = ptr.p->hashValue() & mask;  
-    hashValues[hv] = next;
+    if (hashValues[hv] == ptr.i)
+    {
+      hashValues[hv] = next;
+    }
+    else
+    {
+      // Will add assert in 5.1
+    }
   }
   
   if(next != RNIL)
diff --git a/storage/ndb/src/kernel/vm/DLHashTable2.hpp b/storage/ndb/src/kernel/vm/DLHashTable2.hpp
index 23ced757d8b..05340317adb 100644
--- a/storage/ndb/src/kernel/vm/DLHashTable2.hpp
+++ b/storage/ndb/src/kernel/vm/DLHashTable2.hpp
@@ -42,8 +42,8 @@ public:
   /**
    * Seize element from pool - return i
    *
-   * Note must be either added using <b>add</b> or released 
-   * using <b>release</b>
+   * Note *must* be added using <b>add</b> (even before hash.release)
+   *             or be released using pool
    */
   bool seize(Ptr<T> &);
 
@@ -374,7 +374,14 @@ DLHashTable2<T, U>::remove(Ptr<T> & ptr){
     prevP->nextHash = next;
   } else {
     const Uint32 hv = ptr.p->hashValue() & mask;  
-    hashValues[hv] = next;
+    if (hashValues[hv] == ptr.i)
+    {
+      hashValues[hv] = next;
+    }
+    else
+    {
+      // Will add assert in 5.1
+    }
   }
   
   if(next != RNIL){
@@ -395,7 +402,14 @@ DLHashTable2<T, U>::release(Ptr<T> & ptr){
     prevP->nextHash = next;
   } else {
     const Uint32 hv = ptr.p->hashValue() & mask;  
-    hashValues[hv] = next;
+    if (hashValues[hv] == ptr.i)
+    {
+      hashValues[hv] = next;
+    }
+    else
+    {
+      // Will add assert in 5.1
+    }
   }
   
   if(next != RNIL){