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CONTAP-182745: mgwd crashes during ANDU from memory shortage

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Category:
ontap-9
Specialty:
core
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Issue

Node during an ONTAP upgrade panics with either:

  • mgwd becoming unresponsive on watchdog
  • mgwd running out of swap space/memory.

Example panic messages:
[Process mgwd unresponsive for 182 seconds (mgwd startup: "(55040)") in process nodewatchdog on release 9.13.0P4 (C)]
[OOM: out of swap space, process mgwd using 1346 MB in process pageout: dom0 on release 9.13.0P4 (C) (C)]
Some additional observations:
  • User may lose access to cluster during this time.
  • Depending on which node is being upgraded at the time, user applications report offline for one node, while its HA partner is in partial giveback.

[Cluster::> storage failover show]
[ Takeover]
[Node Partner Possible State Description]
[-------------- -------------- -------- -------------------------------------]
[Cluster-01]
[ Cluster-02 true Connected to]
[ Cluster-02. Waiting]
[ for cluster applications to come]
[ online on the local node. Offline]
[ applications: mgmt, vifmgr, scsi]
[ blade, clam.]
[Cluster-02]
[ Cluster-01 true Connected to]
[ Cluster-01, Partial giveback ]
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