Skip to main content
NetApp Knowledge Base

How to troubleshoot StorageGRID unable to communicate with node (NDDOWN)

Last Updated:

Applies to

  • NetApp StorageGRID
  • NetApp StorageGRID Appliances
  • NetApp StorageGRID VMware based nodes
  • NetApp StorageGRID Bare-metal based nodes


This article helps in identifying the cause of a StorageGRID node down. Multiple causes may cause a StorageGRID node to be in a disconnected state, such as:

  • Maintenance operations
  • Network connectivity issues
  • Hardware issues
  • File system corruption
  • Resource issues (such as CPU, memory or disk). A common symptom of resource issues is sluggish/slow responses within the systems shell/cli/ssh.
  • Decommission

StorageGRID may report the following errors:

  • StorageGRID node(s) appear next to a blue icon StorageGRID node(s) (Disconnected – Unknown) in the Grid Manager
  • StorageGRID reports the Unable to communicate with Node alert
  • Unexpected node reboot if the node came back online on its own
  • StorageGRID reports the NDDOWN legacy alarm
  • If AutoSupport is enabled, it will open a NDDOWN AutoSupport incident:
    • CSTARS:StorageGRID Notification from <serial number> (NODE_DOWN-CRITICAL) ERROR


Sign in to view the entire content of this KB article.

New to NetApp?

Learn more about our award-winning Support

NetApp provides no representations or warranties regarding the accuracy or reliability or serviceability of any information or recommendations provided in this publication or with respect to any results that may be obtained by the use of the information or observance of any recommendations provided herein. The information in this document is distributed AS IS and the use of this information or the implementation of any recommendations or techniques herein is a customer's responsibility and depends on the customer's ability to evaluate and integrate them into the customer's operational environment. This document and the information contained herein may be used solely in connection with the NetApp products discussed in this document.