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    • https://kb.netapp.com/on-prem/ontap/DP/SnapMirror/SnapMirror-KBs/Cluster_peer_creation_fail_with_error__Failed_to_commit_transaction_Reason__duplicate_entry
      Cluster peering fails with error: Error: Failed to commit transaction. Reason: duplicate entry Tue Feb 15 2022 12:22:57 +01:00 [kern_audit:info:2066] 8:: cluster:ssh :: localhost:unknown :: cluster:us...Cluster peering fails with error: Error: Failed to commit transaction. Reason: duplicate entry Tue Feb 15 2022 12:22:57 +01:00 [kern_audit:info:2066] 8:: cluster:ssh :: localhost:unknown :: cluster:username :: cluster peer create -address-family ipv4 -peer-addrs <ip_addr> -ipspace Default -timeout 60 -rpc-connect-timeout 10 -update-ping-timeout 5 -no-authentication false -generate-passphrase *** :: Error: Failed to commit transaction. Reason: duplicate entry.
    • https://kb.netapp.com/on-prem/ontap/DP/SnapMirror/SnapMirror-KBs/How_to_verify_optimal_MTU_packet_size_for_cluster_peering_and_snapmirror
      Applies to ONTAP 9 Description Due negative effects of fragmenting Packets on SnapMirror performance, it is ideal to match the Maximum Transmission Unit (MTU) size of Intercluster interfaces with the ...Applies to ONTAP 9 Description Due negative effects of fragmenting Packets on SnapMirror performance, it is ideal to match the Maximum Transmission Unit (MTU) size of Intercluster interfaces with the network between
    • https://kb.netapp.com/on-prem/ontap/DP/SnapMirror/SnapMirror-KBs/Cluster_peer_no_longer_available_cpeer_unavailable_ALERT
      Applies to ONTAP 9 Cluster peering MTU mismatch Network Issue Cluster peer shows unreachable for nodes on one side:
    • https://kb.netapp.com/on-prem/ontap/DP/SnapMirror/SnapMirror-KBs/Unable_to_establish_cluster_peering_between_two_clusters
      Applies to ONTAP 9 Cluster Peering Firewall Ports required Issue cluster peer create command worked Pings between clusters work cluster peer show command shows peer as unavailable
    • https://kb.netapp.com/on-prem/ontap/DP/SnapMirror/SnapMirror-KBs/SnapMirror_transfers_failing_on_single_IC_LIF_for_a_single_node
      Applies to ONTAP 9.x SnapMirror Issue SnapMirror is failing for a single node when full-mesh connectivity is lost Cluster peer fails due to a specific node in the cluster can't be pinged or reached Cu...Applies to ONTAP 9.x SnapMirror Issue SnapMirror is failing for a single node when full-mesh connectivity is lost Cluster peer fails due to a specific node in the cluster can't be pinged or reached Customer could not see the IP of the IC LIF reaching internal switch -EMS logs cpeer.addr.stable.down:error]:Stable address xxx.xxx.xxx.xxx of cluster <name>, in IPspace Default, cannot be contacted. mgwd: cpeer.unavailable:alert]:Peer cluster <name> is no longer available
    • https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/Flexgroup_snapmirror_initialize_fails_with_Peer_cluster_is_no_longer_available
      Wed Sep 28 11:25:04 2022 FlexGroupInitialize[Sep 28 11:10:36]:c7b4e440-2d28-xxxx-xxxx-xxxxxxxxxxxx Operation-Uuid=bd7135bc-3ed2-11ed-b811-d039ea995e93 Group=flexgroup Operation-Cookie=0 action=End sou...Wed Sep 28 11:25:04 2022 FlexGroupInitialize[Sep 28 11:10:36]:c7b4e440-2d28-xxxx-xxxx-xxxxxxxxxxxx Operation-Uuid=bd7135bc-3ed2-11ed-b811-d039ea995e93 Group=flexgroup Operation-Cookie=0 action=End source=svm1:vol1 destination=dr_svm1:dr_vol1 status=Failure message=Group Update failed(Failed to complete update operation on one or more item relationships.)
    • https://kb.netapp.com/on-prem/ontap/DP/SnapMirror/SnapMirror-KBs/After_upgrade_cpeer_xcm_update_warn__Periodic_update_of_peer_network_information_failed
      After upgrade messages similar to these examples are found in EMS logs cluster peer ping highlights unstable communication with the peer cluster. cpeer.xcm.update.warn: Periodic update of peer network...After upgrade messages similar to these examples are found in EMS logs cluster peer ping highlights unstable communication with the peer cluster. cpeer.xcm.update.warn: Periodic update of peer network information failed. cpeer.unavailable: Peer cluster netapp TELECOM is no longer available Note: No changes have been made to the network side, prior to or after the upgrade High number of 'malformed packets' seen in TCPDump on the destination side High number of CSM counters on the destination side
    • https://kb.netapp.com/on-prem/ontap/DM/System_Manager/SM-KBs/Cluster_peering_displays_an_incorrect_name_after_a_cluster_was_renamed
      Applies to ONTAP 9 Cluster Peering Commvault Active IQ Unified Manager (UM) 9.X Issue Cluster peering is already setup One of the peer clusters is renamed UM shows the error resource-key not discovere...Applies to ONTAP 9 Cluster Peering Commvault Active IQ Unified Manager (UM) 9.X Issue Cluster peering is already setup One of the peer clusters is renamed UM shows the error resource-key not discovered for the source SVM and source volume Commvault aux copy jobs fail
    • https://kb.netapp.com/on-prem/ontap/DP/SnapMirror/SnapMirror-KBs/My_Vserver_peer_create_relationship_failing_with_failed_to_communicate_with_peer_cluster
      Job "'vserver peer create'" [id 23125] (Creating a Vserver peer relationship between source vservername and destination vserver completed unsuccessfully: Failed to communicate with peer cluster. Reaso...Job "'vserver peer create'" [id 23125] (Creating a Vserver peer relationship between source vservername and destination vserver completed unsuccessfully: Failed to communicate with peer cluster. Reason: (Failed to contact peer cluster "destination" at addresses: xx.xxx.xx.xx. RPC: Remote system error [from mgwd on node "nodename" (VSID: -3 source vserver) to mgwd at xx.xxx.x.xx). cluster peer show -cluster <source cluster> Peer Cluster Name: <destination cluster?
    • https://kb.netapp.com/on-prem/ontap/DP/SnapMirror/SnapMirror-KBs/Cluster_peering_is_stuck_in_pending_after_two_clusters_added_with_the_same_cluster_license
      Applies to ONTAP 9 Cluster Peering Issue Cluster peering stuck in pending state
    • https://kb.netapp.com/on-prem/ontap/Ontap_OS/OS-KBs/Cluster_peering_is_stuck_in_pending_with_CSM_error_CSM_CONN_TEMP_AUTH_CHANGE
      Cluster peering is stuck in pending with CSM error CSM_CONN_TEMP_AUTH_CHANGE. Peer Cluster Name Cluster Serial Number Availability Authentication [?] Mon Jul 19 11:27:12 +0200 [cluster_node_name: CsmM...Cluster peering is stuck in pending with CSM error CSM_CONN_TEMP_AUTH_CHANGE. Peer Cluster Name Cluster Serial Number Availability Authentication [?] Mon Jul 19 11:27:12 +0200 [cluster_node_name: CsmMpAgentThread: csm.sessionFailed:debug]: Cluster interconnect session (req=cluster_node_name:dblade, rsp=cluster_node_name:dblade, uniquifier=0705c197627b642f) failed with record state ACTIVE, CSM error CSM_CONN_TEMP_AUTH_CHANGE, low-level error UNKNOWN, socket error 0, and TLS error 0.