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Disk missing on CVO causing system to panic

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Applies to

  • Cloud Volumes ONTAP (CVO)
  • Cloud Manager (CM)
  • Microsoft Azure
  • Amazon Web Services (AWS)
  • Google Cloud Platform (GCP)
  • Single Node

Issue

  • One or more disks becomes unreachable due to an issue in the underline infrastructure and causes a panic:

[Cluster-01: pha_remove000: mlm.array.lun.removed:notice]: Array LUN '0b.29' (00000000i3g268fHE60S) is no longer being presented to this node.


[Cluster-01: dmgr_thread: raid.disk.missing:info]: Disk /aggr04/plex0/rg0/0b.29 S/N [00000000i3g268fHE60S] UID [00000000i3g268fHE60S] is missing from the system


[Cluster-01: config_thread: sk.panic:alert]: Panic String: aggr aggr04: raid volfsm, fatal disk error in RAID group with no parity disk..  Raid type - raid0 Group name plex0/rg0 state NORMAL. 1 disk failed in the group. Disk 0b.29 S/N [00000000i3g268fHE60S] UID [00000000i3g268fHE60S] error: disk does not exist. in SK process config_thread on release 9.7P7 (C)

[Cluster-01: config_thread: sk.panic:alert]: params: {'reason': 'aggr aggr04: raid volfsm, fatal disk error in RAID group with no parity disk..  Raid type - raid0 Group name plex0/rg0 state NORMAL. 1 disk failed in the group. Disk 0b.29 S/N [00000000i3g268fHE60S] UID [00000000i3g268fHE60S] error: adapter error prevents command from being sent to device. in SK process config_thread on release 9.7P7 (C)'}

  • Under some circumstances, the system may instead panic with a WAFL Hung panic:
        Panic String: WAFL hung for aggr1. in SK process wafl_exempt02 on release 9.9.0 (C)
  • In AWS/GCP it may result in plex failure. On Azure it may result in panic if disks (page blobs in case of Azure HA root/data aggregate) are not reachable.
  • Support Case might get created automatically due to HA Group Notification (PARTNER DOWN, TAKEOVER IMPOSSIBLE ) EMERGENCY alert

 

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