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Node root volume full due to microfile generation

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ontap-9
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core
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Applies to

  • ONTAP 9
  • Cloud Volumes ONTAP (CVO)

Issue

  • A warning message appears when a node's root volume has become full or almost fullThe node cannot operate properly when its root volume is fullNote: When a node's root volume reaches 100% full, the system will panic, frequently requiring root volume recovery.Example:

PANIC: Process vifmgr unresponsive for 180 seconds in process nodewatchdog on release 9.15P6 (C) 

  • EMS logs  will denote that root volume vol0 is full:                                     
  • The error may also be seen when accessing the node's Service Processor:

CRITICAL. This node is not healthy because the root volume is low on space (<10MB). The node can still serve data, but it cannot participate in cluster operations until this situation is rectified. Free space using the nodeshell or contact technical support for assistance.

  • EMS is flooded with microcore generation messages

Tue Jun 30 14:07:12 +0530 [Node: coredump_manager: coredump.micro.completed:info]: Microcore (/etc/crash/micro-core.53xxxxx74.2026-06-30.08_37_12) generation completed
Tue Jun 30 14:07:15 +0530 [Node: coredump_manager: callhome.micro.core:notice]: Call home for MICRO-CORE: /etc/crash/micro-core.53xxxxx74.2026-06-30.08_37_14
Tue Jun 30 14:07:15 +0530 [Node: coredump_manager: coredump.micro.completed:info]: Microcore (/etc/crash/micro-core.53xxxxx74.2026-06-30.08_37_14) generation completed
Tue Jun 30 14:07:16 +0530 [Node: coredump_manager: callhome.micro.core:notice]: Call home for MICRO-CORE: /etc/crash/micro-core.53xxxxx74.2026-06-30.08_37_16
Tue Jun 30 14:07:16 +0530 [Node: coredump_manager: coredump.micro.completed:info]: Microcore (/etc/crash/micro-core.53xxxxx74.2026-06-30.08_37_16) generation completed
Tue Jun 30 14:07:16 +0530 [Node: notifyd: asup.throttle.drop:notice]: Too many AutoSupport messages in too short a time, throttling AutoSupport: HA Group Notification from Node (MICRO-CORE micro-core.53xxxxx74.2026-06-30.08_37_16) NOTICE
Tue Jun 30 14:07:17 +0530 [Node: coredump_manager: callhome.micro.core:notice]: Call home for MICRO-CORE: /etc/crash/micro-core.53xxxxx74.2026-06-30.08_37_17
Tue Jun 30 14:07:17 +0530 [Node: coredump_manager: coredump.micro.completed:info]: Microcore (/etc/crash/micro-core.53xxxxx74.2026-06-30.08_37_17) generation completed
Tue Jun 30 14:07:33 +0530 [Node: coredump_manager: callhome.micro.core:notice]: Call home for MICRO-CORE: /etc/crash/micro-core.53xxxxx74.2026-06-30.08_37_33
Tue Jun 30 14:07:33 +0530 [Node: coredump_manager: coredump.micro.completed:info]: Microcore (/etc/crash/micro-core.53xxxxx74.2026-06-30.08_37_33) generation completed

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