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Azure CVO node shows unhealthy and disks in unknown state after maintenance event

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cloud-volumes-ontap-cvo
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Applies to

  • Cloud Volumes ONTAP (CVO)
  • ONTAP 9
  • Microsoft Azure

Issue

  • After an Azure platform maintenance event that caused non-simultaneous (asynchronous) reboots of both nodes in a CVO HA pair, one node (e.g., Cluster-02) reports as “unhealthy” with all local disks showing container type “unknown”.
  • Aggregate(s) on the affected node appear offline or in an unknown state, but the partner node and its aggregates remain online.

Example CLI/log output:

Cluster::> cluster show -health false 
Node           Health  Eligibility
Cluster-01     false   true
Cluster-02     true    true

Cluster::> storage disk show 

Usable Disk     Container Type   Container Name    Owner
NET-1.2         ---              unknown          Cluster-01
NET-1.23        8.00TB           unknown          Cluster-01
NET-1.34        8.00TB           unknown          Cluster-01

Cluster::> aggr show 
Aggregate                  State     #Vols  Nodes           RAID Status
aggr0_Cluster_01           ---       -      unknown         -
aggr0_Cluster_02           online    1      Cluster-02      raid0, normal
aggr1                      ---       -      unknown         -

Cluster::*> cluster ring show 
Node      UnitName Epoch    DB Epoch DB Trnxs Master    Online
--------- -------- -------- -------- -------- --------- ---------
Cluster-01
          mgmt     188      188      47621    Cluster-01         
                                                        master
Cluster-01
          vldb     146      146      2423     Cluster-02
                                                        secondary
Cluster-01
          vifmgr   215      215      40       Cluster-02
                                                        secondary
Cluster-01
          bcomd    232      232      149      Cluster-02
                                                        secondary
Cluster-01
          crs      144      144      1        Cluster-02
                                                        secondary
Cluster-02
          mgmt     188      188      8415     Cluster-02       
                                                        master
Cluster-02
          vldb     146      146      2423     Cluster-02
                                                        master

Node      UnitName Epoch    DB Epoch DB Trnxs Master    Online
--------- -------- -------- -------- -------- --------- ---------
Cluster-02
          vifmgr   215      215      40       Cluster-02
                                                        master
Cluster-02
          bcomd    232      232      149      Cluster-02
                                                        master
Cluster-02
          crs      144      144      1        Cluster-02
                                                        master

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