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CONTAP-182745: mgwd crashes during ANDU from memory shortage

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Category:
ontap-9
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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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