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

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storagegrid-webscale
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sgrid
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Applies to

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

Description

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

 

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