code: void force()
                      throws ObjectManagerException
      {
          final String methodName = "force";
          if (Tracing.isAnyTracingEnabled() && trace.isEntryEnabled())
              trace.entry(this,
                          cclass,
                          methodName);
  
          try {
              storeChannel.force(false); // Force buffered records and not metadata to disk.
  
          } catch (java.io.IOException exception) {
              // No FFDC Code Needed.
              ObjectManager.ffdc.processException(this, cclass, methodName, exception, "1:923:1.39");
  
              if (Tracing.isAnyTracingEnabled() && trace.isEntryEnabled())
                  trace.exit(this,
                             cclass,
                             methodName);
  
              // cannot continue
              objectManagerState.requestShutdown();
              throw new PermanentIOException(this,
                                             exception);
          } // catch.
          if (Tracing.isAnyTracingEnabled() && trace.isEntryEnabled())
              trace.exit(this,
                         cclass,
                         methodName);
      }
docs: Force updates to disk.
  
  @throws ObjectManagerException