If your cluster has a Backup or Performance Accelerator node you probably need to install patch-112048.  This patch can be downloaded from the Downloads section of the Isilon OneFS product page.  [URL]  From the patch readme file:  Patch-112048: Patch for OneFS 6.5.5.23. This patch addresses an issue in the OneFS web administration interface where the main cluster status page did not display information correctly.   --------------------------------------------------------------------------------   This patch can be installed on clusters running the following OneFS version: 6.5.5.23                This issue is fixed in: 6.5.5.24   ********************************************************************************   RESOLVED ISSUES   *On clusters running OneFS 6.5.5.23, the status page of the OneFS web administration interface did not display the expected node statistics if the cluster contained any nodes that did not belong to a disk pool (for example, Accelerator or Backup Accelerator nodes).
I have just upgraded a cluster from OneFS 6.5.5.18 to 6.5.5.23. The upgrade went smoothly but the cluster status on the WebUI does not show anymore. I can do 'isi status' on the CLI and see the cluster status but not on the WebUI.  I can also drill down on each node on the WebUI and see status for each node but the dashboard on the homepage is blank.  Any ideas? 
WebUI dashboad blank after OneFS upgrade