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    • StorageGRID nodes in unknown state after improper shutdown
      https://kb.netapp.com/hybrid/StorageGRID/Maintenance/StorageGRID_nodes_in_unknown_state_after_improper_shutdown
      Applies to NetApp StorageGRID Issue One or more GRID nodes are in unknown state Unknown node's storagegrid-status reports services are running ​​​​​​​ Storage node's nodetool status reports UN for som...Applies to NetApp StorageGRID Issue One or more GRID nodes are in unknown state Unknown node's storagegrid-status reports services are running ​​​​​​​ Storage node's nodetool status reports UN for some nodes /var/local/log/nms.log on Primary Admin reports the following: MariaDBWrapper.java:1280: Cannot lock table. tempwritetree exists.
    • Outage due to no failover targets during node removal
      https://kb.netapp.com/on-prem/ontap/Ontap_OS/OS-KBs/Outage_due_to_no_failover_targets_during_node_removal
      Applies to ONTAP 9 Node Removal Issue While attempting to remove nodes from the cluster, LIF failover was unsuccessful following reboots. Sun May 05 17:20:25 -0400 [cluster1: vifmgr: vifmgr.lifdown.no...Applies to ONTAP 9 Node Removal Issue While attempting to remove nodes from the cluster, LIF failover was unsuccessful following reboots. Sun May 05 17:20:25 -0400 [cluster1: vifmgr: vifmgr.lifdown.noports:alert]: LIF data_LIF (on virtual server 2), IP address 1.1.1.1, currently cannot be hosted on node cluster1-01, port e0c, or any of its failover targets, and is being marked as down.
    • Flexgroup stopped serving NFS data after a Node panic or halt
      https://kb.netapp.com/on-prem/ontap/Ontap_OS/OS-KBs/Flexgroup_stopped_serving_NFS_data_after_a_Node_panic_or_halt
      NFS data serving disruption after a Node panic or halt FlexGroup operations stalled or appear stuck for several minutes when one or more of the nodes are halted [cluster01-n05: CsmMpAgentThread: csm.c...NFS data serving disruption after a Node panic or halt FlexGroup operations stalled or appear stuck for several minutes when one or more of the nodes are halted [cluster01-n05: CsmMpAgentThread: csm.createSessionFailed:debug]: Cluster Session Manager (CSM) failed to create session (req=cluster01-n05:dblade, rsp=custer01-n07:dblade, uniquifier=1105xxxxxxxxa0c3) with record state STARTING, CSM error CSM_CONNABORTED, low-level error UNKNOWN, socket error 0, and TLS error 0.
    • Cluster Interconnect delay due to data LIFs not local to node owning disks
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/Cluster_Interconnect_delay_due_to_data_LIFs_not_local_to_node_owning_disks
      cluster1::> qos statistics volume latency show -iterations 100 Workload ID Latency Network Cluster Data Disk QoS NVRAM Cloud --------------- ------ -------- -------- -------- -------- -------- -------...cluster1::> qos statistics volume latency show -iterations 100 Workload ID Latency Network Cluster Data Disk QoS NVRAM Cloud --------------- ------ -------- -------- -------- -------- -------- -------- ---------- ---------- -total- 110.35ms 0ms 110.02ms 327.00us 0ms 0ms 0ms 0ms vs1vol0 111 167.82ms 0ms 167.22ms 603.00us 0ms 0ms 0ms 0ms vol1 1234 117.76ms 0ms 117.56ms 191.00us 0ms 0ms 0ms 0ms
    • Backend instability can cause aggregate to go offline in Azure CVO environment
      https://kb.netapp.com/Cloud/Cloud_Volumes_ONTAP/Back_end_instability_can_cause_aggregate_to_go_offline_in_Azure_CVO_environment
      Applies to Cloud Volumes ONTAP (CVO) 9.x Microsoft Azure Issue Aggregate goes offline when a disk fails due to the aggregate being raid0.
    • LUN connectivity lost during upgrade of ONTAP to 9.9.1
      https://kb.netapp.com/on-prem/ontap/mc/MC-KBs/LUN_connectivity_lost_during_upgrade_of_ONTAP_to_9.9.1
      Applies to ONTAP 9.9.1 2-node MetroCluster Issue After performing switchover/switchback during ONTAP upgrade LUN connectivity is lost. On the sync-destination vserver, missing igroups and lun mappings...Applies to ONTAP 9.9.1 2-node MetroCluster Issue After performing switchover/switchback during ONTAP upgrade LUN connectivity is lost. On the sync-destination vserver, missing igroups and lun mappings are identified by running ONTAP CLI commands igroup show or lun show. LUN connectivity is restored after the final switchback.
    • Citrix pool master timeout on heartbeat volume during slice migration
      https://kb.netapp.com/on-prem/solidfire/Element_OS_Kbs/Citrix_pool_master_timeout_on_heartbeat_volume_during_slice_migration
      slice82[57705]: [UNCERR-3] [SCSIDevice] 22949 TSSocket-81 iscsitarget/SCSITask.cpp:664:Abort|srcid=3794 reqid=553648144 EIO-WARNING: cMaxSCSITaskLatencyAbortEventLimitMSec=20000 SCSITask: tag=18454937...slice82[57705]: [UNCERR-3] [SCSIDevice] 22949 TSSocket-81 iscsitarget/SCSITask.cpp:664:Abort|srcid=3794 reqid=553648144 EIO-WARNING: cMaxSCSITaskLatencyAbortEventLimitMSec=20000 SCSITask: tag=1845493776 sessionID=347892354770 volumeID=160 RawLUN=0x0 generation=0xf0cdd9e896c498e8 mTaskState=Enabled mCommandType=Write mVolumeBlockSize=512 mExpectedTransferLength=65536 mSCSITransferLength=65536 mActualTransferLength=65536 mScsiStatus=0xff mAborted=1 mAbortCompleted=0 mAbortReason=InitiatorSentAbor…
    • Microsoft SQL outage during ONTAP MetroCluster staged upgrades
      https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/Microsoft_SQL_outage_during_ONTAP_MetroCluster_staged_upgrades
      ONTAP 9.3 and above ONTAP MetroCluster VMware ESXi 6.5 and above Microsoft SQL services interrupted during multi step staged non-disruptive upgrade of ONTAP from 9.3 - 9.5 - 9.7 Only VMware virtualize...ONTAP 9.3 and above ONTAP MetroCluster VMware ESXi 6.5 and above Microsoft SQL services interrupted during multi step staged non-disruptive upgrade of ONTAP from 9.3 - 9.5 - 9.7 Only VMware virtualized Windows Server failover clustering with SQL server instance impacted Data is accessed via raw device mappings (RDM) with no indication of all paths down (APD) or permanent device loss (PDL) Cluster shared disks are configured as per VMware best practices and check list and following setup guide
    • SQL or other outage during Cluster Switch Upgrade
      https://kb.netapp.com/on-prem/ontap/Ontap_OS/OS-KBs/SQL_or_other_outage_during_Cluster_Switch_Upgrade
      Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="disk" /> <EventID Qualifiers="32772">153</EventID> <Level>3</Level> <Task>0</Task> <Keywords>...Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="disk" /> <EventID Qualifiers="32772">153</EventID> <Level>3</Level> <Task>0</Task> <Keywords>0x80000000000000</Keywords> <TimeCreated SystemTime="2021-03-03T06:27:12.317465000Z" /> <EventRecordID>58122343</EventRecordID> <Channel>System</Channel> <Computer>sql1.company.com</Computer> <Security /> </System> <EventData> <Data>\Device\Harddisk0\DR0</Data> <Data>0x2fa2da1</Data> <Data>0</Data>…