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Troubleshooting Workflow: MHost RDB apps out of quorum
https://kb.netapp.com/on-prem/ontap/Ontap_OS/OS-KBs/Troubleshooting_Workflow__MHost_RDB_apps_out_of_quorum
Additionally, one site might be designated as holding 'epsilon' - an extra partial vote that allows quorum to form with only half the sites. 'Epsilon' is not the same as 'master'. In the two-node HA m...Additionally, one site might be designated as holding 'epsilon' - an extra partial vote that allows quorum to form with only half the sites. 'Epsilon' is not the same as 'master'. In the two-node HA mode, _sitelist contains the HA_CONFIG attribute; this implies that completely different rules are in effect for quorum handling. The typical technique is to cat the /var/rdb/_sitelist, then use the rdb_dump tool to investigate by directing it at the IP addresses of interest (or at localhost).
How to troubleshoot optical SAS cable issues?
https://kb.netapp.com/on-prem/ontap/mc/MC-KBs/How_to_troubleshoot_optical_SAS_cable_issues
Applies to Streched MetroCluster ONTAP 9 ONTAP 8 Description This article describes how to troubleshoot optical SAS cable issues
What are Best Practices for Network Configuration for ONTAP?
https://kb.netapp.com/on-prem/ontap/da/NAS/NAS-KBs/What_are_Best_Practices_for_Network_Configuration_for_ONTAP
Networking Best Practices for ONTAP 9 are in the respective sections in Ethernet Storage Design Considerations, Best Practices for Clustered Data ONTAP | TR-4182 Disable flow control on all cluster ne...Networking Best Practices for ONTAP 9 are in the respective sections in Ethernet Storage Design Considerations, Best Practices for Clustered Data ONTAP | TR-4182 Disable flow control on all cluster network ports in an ONTAP cluster. Ethernet Storage Design Considerations, Best Practices for Clustered Data ONTAP | TR-4182 Data ONTAP 8.2 Network Management Guide For 7-Mode
What is the default IP behavior when configuring management ports on E-Series?
https://kb.netapp.com/on-prem/E-Series/Management-Apps-KBs/What_is_the_default_IP_behavior_when_configuring_management_ports_on_E_Series
If a controller is unable to obtain a DHCP address on a given network port, it will revert to a default static IP address. Default static IP addresses are not persisted across link-down events when a ...If a controller is unable to obtain a DHCP address on a given network port, it will revert to a default static IP address. Default static IP addresses are not persisted across link-down events when a network port on a controller is set to use DHCP. If a port is configured for DHCP the controller will attempt to obtain a DHCP address on every link-up event, including cable insertions, reboots, and power cycles.
FAQ: 40Gb/s Ethernet extended optical multimode fiber cable for link distances up to 400 meters
https://kb.netapp.com/on-prem/ontap/Ontap_OS/OS-KBs/FAQ__40Gb_s_Ethernet_extended_optical_multimode_fiber_cable_for_link_distances_up_to_400_meters
When using multimode fiber (MMF) optical cable for 40Gb/s Ethernet (40GbE) extended connections, the distance between the host or switch and the storage system can be up to 400 meters over OM4 MMF. To...When using multimode fiber (MMF) optical cable for 40Gb/s Ethernet (40GbE) extended connections, the distance between the host or switch and the storage system can be up to 400 meters over OM4 MMF. To deploy optical MMF 40Gb/s Ethernet connectivity for extended distances, customers must adhere to the following requirements: The only practical way for establishing the maximum supported distance is to test the desired configuration in the actual customer environment.
What are SMB Continuous Availability (CA) Shares
https://kb.netapp.com/on-prem/ontap/da/NAS/NAS-KBs/What_are_SMB_Continuous_Availability_CA_Shares
CA Shares are supported in ONTAP 8.2 and later, supported for SMB shares for both Hyper-V virtual machine files or SQL Server system databases and user databases on volumes residing in Storage Virtual...CA Shares are supported in ONTAP 8.2 and later, supported for SMB shares for both Hyper-V virtual machine files or SQL Server system databases and user databases on volumes residing in Storage Virtual Machines (SVMs) with FlexVol volumes and FlexGroups (9.6+), while at the same time providing nondisruptive operations (NDOs) for both planned and unplanned events.
MetroCluster switchover AIX host LUN not accessible
https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/MetroCluster_switchover_AIX_host_LUN_not_accessible
Applies to ONTAP 9.x Issue AIX hosts lost connectivity to LUNs during a switchover operation Issue was resolved via switchback Other hosts where not impacted for example VMware ESXi hosts
What issues are resolved in the ATTO FibreBridge Firmware?
https://kb.netapp.com/on-prem/ontap/mc/MC-KBs/What_issues_are_resolved_in_the_ATTO_FibreBridge_Firmware
ATTO Fibrebridge firmware 3.16 and 4.16 might cause disk drives to go into error recovery mode during a disk firmare update ATTO web interface displays misformatted output for the dumpconfiguration co...ATTO Fibrebridge firmware 3.16 and 4.16 might cause disk drives to go into error recovery mode during a disk firmare update ATTO web interface displays misformatted output for the dumpconfiguration command not correctly displayed in the ATTO web interface Incorrect dual-path configurations to the same ATTO 7500N FibreBridge might cause disk ownership issues Hot adding or removing a shelf in quick succession to an ATTO 7500N FibreBridge might cause a misdirected I/O
How to manage multiple iSCSI sessions in Solaris 10/11 with Dynamic Discovery method
https://kb.netapp.com/on-prem/ontap/da/SAN/SAN-KBs/How_to_manage_multiple_iSCSI_sessions_in_Solaris_10_11_with_Dynamic_Discovery_method
Applies to Solaris 10/11 Description Package iscsiadm manages iSCSI software initiator on the host. When using the dynamic device discovery method, specifying the correct session count ensures that se...Applies to Solaris 10/11 Description Package iscsiadm manages iSCSI software initiator on the host. When using the dynamic device discovery method, specifying the correct session count ensures that sessions are created on individual TPGT (Target Portal Group Tag). Dynamic discovery allows specifying a single target device address (IQN or IP). Query via SendTargets for visible target devices or target portal group tags.
Failed brocade boot of Fabric OS
https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/Failed_brocade_boot_of_Fabric_OS
Applies to Brocade 6505 Fiber switch Issue Hda1 partition can get corrupted and unable to load services at boot up
Active IQ digital Advisor (Wellness Risk) Disk Qualification Package (DQP)
https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/ONTAP_and_Disk_Qualification_Package_DQP
The Disk Qualification Package (DQP) adds full support for newly qualified drives. Before you update drive firmware or add new drive types or sizes to a cluster, you must update the DQP. A best practi...The Disk Qualification Package (DQP) adds full support for newly qualified drives. Before you update drive firmware or add new drive types or sizes to a cluster, you must update the DQP. A best practice is to also update the DQP regularly; for example, every quarter or semi-annually.