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FCP initiator not logged in on VTIC
https://kb.netapp.com/on-prem/ontap/da/SAN/SAN-KBs/FCP_initiator_not_logged_in_on_VTIC
Applies to Data ONTAP operating in 7-mode Issue Initiators not logged in on unoptimized (or partner) paths.
How to identify controller iSCSI IQN in clustered Data ONTAP
https://kb.netapp.com/on-prem/ontap/da/SAN/SAN-KBs/How_to_identify_controller_iSCSI_IQN_in_clustered_Data_ONTAP
Applies to ONTAP 9.x SAN Protocol Description This article describes the procedure that should be followed to identify the controller's iSCSI IQN in clustered Data ONTAP.
What are FC CRC errors and how to resolve them
https://kb.netapp.com/on-prem/Switches/Brocade-KBs/CRC_errors_and_how_to_resolve_them_with_FC_and_Brocade_switch_running_any_version_of_Fabric_OS
Applies to Brocade Switch Fibre Channel Cyclic Redundancy Check (CRC) porterrshow displays increased crc err frames enc crc crc too too bad enc disc link loss loss frjt fbsy c3timeout tx rx in err g_e...Applies to Brocade Switch Fibre Channel Cyclic Redundancy Check (CRC) porterrshow displays increased crc err frames enc crc crc too too bad enc disc link loss loss frjt fbsy c3timeout tx rx in err g_eof shrt long eof out c3 fail sync sig tx rx 0: 7.5m 8.7m 0 0 0 0 0 0 316 30 4 506 612 0 0 0 0 1: 3.2g 716.8m 0 11 11 0 0 0 19 14 8 11 14 0 0 0 0 2: 415.9m 3.4g 1.7m 121.8k 84.2k 85 0 37.5k 59.8k 1.5k 6 9 12 0 0 1.5k 0 Note: The connected device may experience disconnects and/or increased latency
VMware Atomic Test and Set heartbeats impact connectivity to storage
https://kb.netapp.com/data-mgmt/OTV/VSC_Kbs/VMware_Atomic_Test_and_Set_heartbeats_impact_connectivity_to_storage
2022-04-04T12:33:16.355Z cpu1:2097617)NMP: nmp_ThrottleLogForDevice:3872: Cmd 0x89 (0x45bac31031c0, 2097193) to dev "naa.600a09803831364468244e4c5a47494e" on path "vmhba64:C1:T0:L0" Failed: H:0x5 D:0x...2022-04-04T12:33:16.355Z cpu1:2097617)NMP: nmp_ThrottleLogForDevice:3872: Cmd 0x89 (0x45bac31031c0, 2097193) to dev "naa.600a09803831364468244e4c5a47494e" on path "vmhba64:C1:T0:L0" Failed: H:0x5 D:0x0 P:0x0 Invalid sense data: 0x0 0x0 0x0. 2022-04-04T12:43:13.402Z cpu2:2097617)NMP: nmp_ThrottleLogForDevice:3872: Cmd 0x89 (0x45baf1751140, 2097193) to dev "naa.600a09803831364468244e4c5a47494e" on path "vmhba64:C0:T0:L0" Failed: H:0x5 D:0x0 P:0x0 Invalid sense data: 0x0 0x0 0x0.
Multiple new iSCSI sessions are seen with the same IQN but different initiator IPs
https://kb.netapp.com/on-prem/ontap/da/SAN/SAN-KBs/Multiple_new_iSCSI_sessions_are_seen_with_the_same_IQN_but_different_initiator_IPs
Tue Sep 04 16:18:26 CDT [PRD-NTAP-01: iswti_iscsip_thread: iscsi.warning:warning]: ISCSI: New session request from initiator iqn.1991-05.com.microsoft:prd-app-01.netapp.com, a session from this initia...Tue Sep 04 16:18:26 CDT [PRD-NTAP-01: iswti_iscsip_thread: iscsi.warning:warning]: ISCSI: New session request from initiator iqn.1991-05.com.microsoft:prd-app-01.netapp.com, a session from this initiator already exists. Tue Sep 04 16:20:09 CDT [PRD-NTAP-01: iswti_iscsip_thread: iscsi.warning:warning]: ISCSI: New session request from initiator iqn.1991-05.com.microsoft:prd-app-01.netapp.com, a session from this initiator already exists.
What do "invalid words" errors mean and how are they resolved?
https://kb.netapp.com/on-prem/ontap/Ontap_OS/OS-KBs/What_do_invalid_words_errors_mean_and_how_are_they_resolved
Any version of Data OnTap "Invalid words" errors is seen in fibre channel stats for NetApp controller. This article discusses what these errors mean. From the filer side "invalid words" errors are see...Any version of Data OnTap "Invalid words" errors is seen in fibre channel stats for NetApp controller. This article discusses what these errors mean. From the filer side "invalid words" errors are seen when running commands to view FCP adapter stats. Statistics for adapter 0c: Invalid Transmit Words: 1977 Cluster::*> network fcp adapter stats -node <node> -adapter <adapter> Number of adapter resets: 0 Number of frames overrun: - Number of frames underrun: - Invalid words transmitted: 1983
UCS SAN Boot Reference Documentation
https://kb.netapp.com/hybrid/FlexPod/UCS_SAN_Boot_Reference_Documentation
While most of the documentation is targeted at the Cisco/NetApp partnership program called Flexpod, it is important to note that these documents follow best practices put in place by both NetApp and C...While most of the documentation is targeted at the Cisco/NetApp partnership program called Flexpod, it is important to note that these documents follow best practices put in place by both NetApp and Cisco. If you are unable to find a guide that matches the your current configuration, there are additional guides available at Cisco Flexpod Validated Designs as well as NetApp Validated Designs.
Bad SFPs in Cisco switches
https://kb.netapp.com/on-prem/Switches/Cisco-KBs/Bad_SFPs_in_Cisco_switches
Errors for a particular port, constant or intermittent latency in a host attached to that port is seen. This could be caused due to hardware issues. Steps to troubleshoot and identify if the issue is ...Errors for a particular port, constant or intermittent latency in a host attached to that port is seen. This could be caused due to hardware issues. Steps to troubleshoot and identify if the issue is due to SFP or cable, is described in this KB article.
SAN host does not failover I/O to alternate paths when one or more paths are removed and an RSCN is not received
https://kb.netapp.com/on-prem/ontap/da/SAN/SAN-KBs/SAN_host_does_not_failover_I_O_to_alternate_paths_when_one_or_more_paths_are_removed_and_an_RSCN_is_not_received
In Windows, if one or more paths to the storage target are removed, I/O hangs indefinitely until the path(s) are restored. The issue can be triggered by the removal of an Active/Optimized or Active/Un...In Windows, if one or more paths to the storage target are removed, I/O hangs indefinitely until the path(s) are restored. The issue can be triggered by the removal of an Active/Optimized or Active/Unoptimized path, and is observed regardless if there are Active/Optimized or Active/Unoptimized paths remaining. Generally, resetting the host port or rebooting the host will allow the host to detect any added paths.
What are the parameters that control how MS iSCSI survives lost TCP connections without causing applications harm?
https://kb.netapp.com/on-prem/ontap/da/SAN/SAN-KBs/What_are_the_parameters_that_control_how_MS_iSCSI_survives_lost_TCP_connections_without_causing_applications_harm
During transient loss of connection, instead of reporting "Device not available" immediately, the Microsoft iSCSI initiator will try to reconnect to the target and resubmit outstanding SCSI commands. ...During transient loss of connection, instead of reporting "Device not available" immediately, the Microsoft iSCSI initiator will try to reconnect to the target and resubmit outstanding SCSI commands. Note: Even after a Device Removal event is reported the Microsoft iSCSI initiator will still keep trying to reconnect to the target, as defined by the first two registry values, DelayBetweenReconnect and MaxConnectionRetries.
Brocade SFP reports Laser_Flt error due to faulty switch end sfp
https://kb.netapp.com/on-prem/Switches/Brocade-KBs/How_to_diagnose_and_resolve_laser_flt_errors
KB provides the solution when switchshow port status is Laser_Flt and the reasons why this happens.