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    • SnapCenter report does not complete in a Linux host
      https://kb.netapp.com/data-mgmt/SnapCenter/SC_KBs/SnapCenter_report_does_not_complete_in_a_Linux_host
      Applies to NetApp SnapCenter Linux hosts mounting ontap luns Issue Snapcenter report which access luns mounted in Linux hosts, does not properly complete and leave hung processes
    • IOPS only seen on one node due to indirect iscsi traffic
      https://kb.netapp.com/on-prem/ontap/da/SAN/SAN-KBs/IOPS_only_seen_on_one_node_due_to_indirect_iscsi_traffic
      Applies to ONTAP 9.x Clustered Data ONTAP iSCSI Issue Indirect access on iSCSI SAN
    • Does 'service multipathd reload' command interrupt any previous multipathd working connections ?
      https://kb.netapp.com/on-prem/ontap/da/SAN/SAN-KBs/Does_service_multipathd_reload_command_interrupt_any_previous_multipathd_working_connections
      It is safe to reload multipathd daemon while device-mapper-multipath paths are in use, as it does not impact any existing paths. Looking through the /etc/init.d/multipathd script in reload section, we...It is safe to reload multipathd daemon while device-mapper-multipath paths are in use, as it does not impact any existing paths. Looking through the /etc/init.d/multipathd script in reload section, we see the following code: reload() { The reload process sends a HUP signal to the multipathd daemon, which causes it to re-read the configuration file. Device-mapper-multipath functions without the multipathd daemon running, however without multipathd, path failures will not be detected or handled.
    • Continuous Linux Host DMMP failovers with Oracle ASM, within an E-Series environment
      https://kb.netapp.com/on-prem/E-Series/SANtricity-OS-KBs/Continuous_Linux_Host_DMMP_failovers_with_Oracle_ASM_within_an_E_Series_environment
      May 18 03:47:40 hostname kernel: sd 5:0:0:3: rdac: array example, ctlr 0, MODE_SELECT returned with sense 06/94/01 May 18 03:48:21 hostname kernel: sd 5:0:0:1: rdac: array example, ctlr 0, MODE_SELECT...May 18 03:47:40 hostname kernel: sd 5:0:0:3: rdac: array example, ctlr 0, MODE_SELECT returned with sense 06/94/01 May 18 03:48:21 hostname kernel: sd 5:0:0:1: rdac: array example, ctlr 0, MODE_SELECT returned with sense 06/94/01May 18 03:48:21 hostname kernel: sd 5:0:0:1: rdac: array example, ctlr 0, retrying MODE_SELECT command May 18 03:48:40 hostname kernel: sd 6:0:0:4: rdac: array example, ctlr 1, MODE_SELECT returned with sense 06/94/01
    • FAS500f or AFF-A250 controller running in Single-Path HA with no external shelf
      https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/FAS500f_or_AFF-A250_controller_running_in_Single-Path_HA_with_no_external_shelf
      NetApp Release 9.8P1: Wed Jan 20 20:14:09 EST 2021 System ID: xxxxxxxxxxx (xxxxxxxxxxx); partner ID: xxxxxxxxxx (xxxxxxxxxxxxxx) System Serial Number: xxxxxxxxxxxx(xxxxxxxxxxx) System Rev: A3 System S...NetApp Release 9.8P1: Wed Jan 20 20:14:09 EST 2021 System ID: xxxxxxxxxxx (xxxxxxxxxxx); partner ID: xxxxxxxxxx (xxxxxxxxxxxxxx) System Serial Number: xxxxxxxxxxxx(xxxxxxxxxxx) System Rev: A3 System Storage Configuration: Single-Path HA System ACP Connectivity: Inband Active SAS2/SAS3 Mixed Stack Support: none All-Flash Optimized: true Capacity Optimized: false All SAN Array: false Backplane Part Number: 111-04891+A0 Backplane Serial Number: xxxxxxxxxxxxxxxx slot 0: System Board 2.1 GHz (System…
    • Linux host loses LUN paths with blk_cloned_rq_check_limits error
      https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/Linux_host_loses_LUN_paths_with_blk_cloned_rq_check_limits_error
      Applies to Fibre Channel (FC) LUNs RedHat Enterprise Linux (RHEL) 7.6 RedHat Enterprise Linux (RHEL) 7.7 Linux Unified Host Utilities 7.1 RHEL 7.6 hosts loses paths to LUNs logging the following multi...Applies to Fibre Channel (FC) LUNs RedHat Enterprise Linux (RHEL) 7.6 RedHat Enterprise Linux (RHEL) 7.7 Linux Unified Host Utilities 7.1 RHEL 7.6 hosts loses paths to LUNs logging the following multipath error: kernel:blk_cloned_rq_check_limits: over max size limit Storage VPD advertised transfer length is different to what host is using: scsit_lu_1: scsiblade.invalid.xfer.len:notice]: Host type sent command opcode 0x2a with a transfer length of bytes, which exceeds the maximum of 1MB on LUN
    • E-Series Ubuntu multipath driver does not detect ALUA capabilities correctly
      https://kb.netapp.com/on-prem/E-Series/SANtricity-OS-KBs/E-Series_Ubuntu_multipath_driver_does_not_detect_ALUA_capabilities_correctly
      Applies to E-Series Ubuntu 20.04.3 LTS ALUA Issue After installing Ubuntu 20.04.3 LTS the multipath settings changes from '1 alua' to '1 rdac'
    • How to check "System Storage Configuration" for disk shelf pathing within ONTAP clustershell
      https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/How_to_check_System_Storage_Configuration_for_disk_shelf_pathing_within_ONTAP_clustershell
      Applies to ONTAP 9 Description ONTAP supports a variety of shelf to shelf connectivity types. Typically the type of connectivity is seen within the "sysconfig" nodeshell output.
    • E-Series - Is the Windows DSM required in VMware physical RDM deployments?
      https://kb.netapp.com/on-prem/E-Series/Management-Apps-KBs/E-Series_-_Is_the_Windows_DSM_required_in_VMware_physical_RDM_deployments
      VMware Physical Raw Device Mappings (pRDM) It is not required to install the E-Series DSM for Windows in VMware environments when deploying physical RDMs (pRDM). VMware ESXi is responsible for managin...VMware Physical Raw Device Mappings (pRDM) It is not required to install the E-Series DSM for Windows in VMware environments when deploying physical RDMs (pRDM). VMware ESXi is responsible for managing the multi-pathing. However installing the DSM inside the Windows guest will not harm anything either. pRDM: Allow the guest operating system to access the hardware directly. vRDM: Allow the virtual machine to use VMware snapshots and other advanced technology.
    • OnCommand Unified Manager reports a Multipath HA issue while controllers in the cluster reports no issue
      https://kb.netapp.com/data-mgmt/AIQUM/AIQUM_Kbs/OnCommand_Unified_Manager_reports_a_Multipath_HA_issue_while_controllers_in_the_cluster_reports_no_issue
      Applies to OnCommand Unified Manager 6.x and later Issue OnCommand Unified Manager (UM) event Disk Shelf Multipath Not Configured for nodes. However, ASUP sysconfig -a reports the system is in MPHA.
    • System reports single path under multi path cabling configuration using IOM6 and IOM12 modules
      https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/System_reports_single_path_under_multi_path_cabling_configuration_using_IOM6_and_IOM12_modules
      System reports Single-Path when cabled for Multi-Path. IOM6 and IOM12 are mixed in the same stack. If the cabling is not correct, the system might trigger an EMS message.