Index: /trunk/src/VBox/VMM/PDMAsyncCompletionFile.cpp
===================================================================
--- /trunk/src/VBox/VMM/PDMAsyncCompletionFile.cpp	(revision 23957)
+++ /trunk/src/VBox/VMM/PDMAsyncCompletionFile.cpp	(revision 23958)
@@ -599,4 +599,6 @@
     if ((rc == VERR_INVALID_FUNCTION) || (rc == VERR_INVALID_PARAMETER))
     {
+        LogRel(("pdmacFileEpInitialize: RTFileOpen %s / %08x failed with %Rrc\n",
+               pszUri, fFileFlags, rc));
         /*
          * Solaris doesn't support directio on ZFS so far. :-\
@@ -616,4 +618,10 @@
         /* Open again. */
         rc = RTFileOpen(&pEpFile->File, pszUri, fFileFlags);
+
+        if (RT_FAILURE(rc))
+        {
+            LogRel(("pdmacFileEpInitialize: RTFileOpen %s / %08x failed AGAIN(!) with %Rrc\n",
+                        pszUri, fFileFlags, rc));
+        }
     }