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NVMe/FC Host Configuration for Oracle Linux 9.0 with ONTAP

Contributors netapp-ranuk

NVMe over Fabrics (NVMe-oF), including NVMe/FC and other transports, is supported with Oracle Linux (OL) 9.0 with Asymmetric Namespace Access (ANA). In NVMe-oF environments, ANA is the equivalent of ALUA multipathing in iSCSI and FC environments and is implemented with in-kernel NVMe multipath.

For additional details on supported configurations, see the NetApp Interoperability Matrix Tool.

Features

  • Oracle Linux 9.0 has in-kernel NVMe multipath enabled for NVMe namespaces by default, therefore, there is no need for explicit settings.

Known limitations

SAN booting using the NVMe-oF protocol is currently not supported.

Validate software versions

You can validate the minimum supported OL 9.0 software versions using the following procedure.

Steps
  1. Install OL 9.0 GA on the server. After the installation is complete, verify that you are running the specified OL 9.0 GA kernel.

    # uname -r

    Example output:

    5.15.0-0.30.19.el9uek.x86_64
  2. Install the nvme-cli package:

    # rpm -qa|grep nvme-cli

    Example output:

    nvme-cli-1.16-3.el9.x86_64
  3. On the Oracle Linux 9.0 host, check the hostnqn string at /etc/nvme/hostnqn:

    # cat /etc/nvme/hostnqn

    Example output:

    nqn.2014-08.org.nvmexpress:uuid:4c4c4544-0032-3310-8033-b8c04f4c5132
  4. Verify that the hostnqn string matches the hostnqn string for the corresponding subsystem on the ONTAP array:

    ::> vserver nvme subsystem host show -vserver vs_ol_nvme

    Example output:

    Vserver     Subsystem          Host NQN
    ----------- --------------- ----------------------------------------------------------
    vs_ol_nvme  nvme_ss_ol_1    nqn.2014-08.org.nvmexpress:uuid:4c4c4544-0032-3310-8033-b8c04f4c5132
    Note If the hostnqn strings do not match, you can use the vserver modify command to update the hostnqn string on your corresponding ONTAP array subsystem to match the hostnqn string from /etc/nvme/hostnqn on the host.

Configure NVMe/FC

You can configure NVMe/FC for Broadcom/Emulex or Marvell/Qlogic adapters.

Broadcom/Emulex
Steps
  1. Verify that you are using the supported adapter model.

    # cat /sys/class/scsi_host/host*/modelname

    Example output:

    LPe32002-M2
    LPe32002-M2
    # cat /sys/class/scsi_host/host*/modeldesc

    Example output:

    Emulex LightPulse LPe32002-M2 2-Port 32Gb Fibre Channel Adapter
    Emulex LightPulse LPe32002-M2 2-Port 32Gb Fibre Channel Adapter
  2. Verify that you are using the recommended Broadcom lpfc firmware and inbox driver:

    # cat /sys/class/scsi_host/host*/fwrev
    14.0.505.11, sli-4:2:c
    14.0.505.11, sli-4:2:c
    
    # cat /sys/module/lpfc/version
    0:12.8.0.11

    For the most current list of supported adapter driver and firmware versions, see the NetApp Interoperability Matrix Tool.

  3. Verify that lpfc_enable_fc4_type is set to 3:

    # cat /sys/module/lpfc/parameters/lpfc_enable_fc4_type
    3
  4. Verify that the initiator ports are up and running, and that you can see the target LIFs:

    # cat /sys/class/fc_host/host*/port_name
    0x100000109b1c1204
    0x100000109b1c1205
    # cat /sys/class/fc_host/host*/port_state
    Online
    Online
    # cat /sys/class/scsi_host/host*/nvme_info
    NVME Initiator Enabled
    XRI Dist lpfc0 Total 6144 IO 5894 ELS 250
    NVME LPORT lpfc0 WWPN x100000109b1c1204 WWNN x200000109b1c1204 DID x011d00 ONLINE
    NVME RPORT WWPN x203800a098dfdd91 WWNN x203700a098dfdd91 DID x010c07 TARGET DISCSRVC ONLINE
    NVME RPORT WWPN x203900a098dfdd91 WWNN x203700a098dfdd91 DID x011507 TARGET DISCSRVC ONLINE
    NVME Statistics
    LS: Xmt 0000000f78 Cmpl 0000000f78 Abort 00000000
    LS XMIT: Err 00000000 CMPL: xb 00000000 Err 00000000
    Total FCP Cmpl 000000002fe29bba Issue 000000002fe29bc4 OutIO 000000000000000a
    abort 00001bc7 noxri 00000000 nondlp 00000000 qdepth 00000000 wqerr 00000000 err 00000000
    FCP CMPL: xb 00001e15 Err 0000d906
    NVME Initiator Enabled
    XRI Dist lpfc1 Total 6144 IO 5894 ELS 250
    NVME LPORT lpfc1 WWPN x100000109b1c1205 WWNN x200000109b1c1205 DID x011900 ONLINE
    NVME RPORT WWPN x203d00a098dfdd91 WWNN x203700a098dfdd91 DID x010007 TARGET DISCSRVC ONLINE
    NVME RPORT WWPN x203a00a098dfdd91 WWNN x203700a098dfdd91 DID x012a07 TARGET DISCSRVC ONLINE
    NVME Statistics
    LS: Xmt 0000000fa8 Cmpl 0000000fa8 Abort 00000000
    LS XMIT: Err 00000000 CMPL: xb 00000000 Err 00000000
    Total FCP Cmpl 000000002e14f170 Issue 000000002e14f17a OutIO 000000000000000a
    abort 000016bb noxri 00000000 nondlp 00000000 qdepth 00000000 wqerr 00000000 err 00000000
    FCP CMPL: xb 00001f50 Err 0000d9f8
Marvell/QLogic FC Adapter for NVMe/FC
Steps
  1. The native inbox qla2xxx driver included in the OL 9.0 GA kernel has the latest upstream fixes essential for ONTAP support. Verify that you are running the supported adapter driver and firmware versions:

    # cat /sys/class/fc_host/host*/symbolic_name
    QLE2742 FW:v9.08.02 DVR:v10.02.00.106-k
    QLE2742 FW:v9.08.02 DVR:v10.02.00.106-k
  2. Verify that ql2xnvmeenable is set which enables the Marvell adapter to function as an NVMe/FC initiator:

    # cat /sys/module/qla2xxx/parameters/ql2xnvmeenable
    1

Enable 1MB I/O size (Optional)

ONTAP reports an MDTS (Max Data Transfer Size) of 8 in the Identify Controller data which means the maximum I/O request size can be up to 1MB. However, to issue I/O requests of size 1 MB for a Broadcom NVMe/FC host, you must increase the lpfc value of the lpfc_sg_seg_cnt parameter to 256 from the default value of 64.

Steps
  1. Set the lpfc_sg_seg_cnt parameter to 256.

    # cat /etc/modprobe.d/lpfc.conf
    options lpfc lpfc_sg_seg_cnt=256
  2. Run a dracut -f command, and reboot the host.

  3. Verify that lpfc_sg_seg_cnt is 256.

    # cat /sys/module/lpfc/parameters/lpfc_sg_seg_cnt
    256
Note This is not applicable to Qlogic NVMe/FC hosts.

Configure NVMe/TCP

NVMe/TCP does not have auto-connect functionality. Therefore, if a path goes down and is not reinstated within the default time out period of 10 minutes, NVMe/TCP cannot automatically reconnect. To prevent a time out, you should set the retry period for failover events to at least 30 minutes.

Steps
  1. Verify that the initiator port can fetch the discovery log page data across the supported NVMe/TCP LIFs:

    nvme discover -t tcp -w host-traddr -a traddr

    Example output:

    #  nvme discover -t tcp -w 192.168.6.13 -a 192.168.6.15
    Discovery Log Number of Records 6, Generation counter 8
    =====Discovery Log Entry 0======
    trtype: tcp
    adrfam: ipv4
    subtype: unrecognized
    treq: not specified
    portid: 0
    trsvcid: 8009
    subnqn: nqn.1992-08.com.netapp:sn.1c6ac66338e711eda41dd039ea3ad566:discovery
    traddr: 192.168.6.17
    sectype: none
    =====Discovery Log Entry 1======
    trtype: tcp
    adrfam: ipv4
    subtype: unrecognized
    treq: not specified
    portid: 1
    trsvcid: 8009
    subnqn: nqn.1992-08.com.netapp:sn.1c6ac66338e711eda41dd039ea3ad566:discovery
    traddr: 192.168.5.17
    sectype: none
    =====Discovery Log Entry 2======
    trtype: tcp
    adrfam: ipv4
    subtype: unrecognized
    treq: not specified
    portid: 2
    trsvcid: 8009
    subnqn: nqn.1992-08.com.netapp:sn.1c6ac66338e711eda41dd039ea3ad566:discovery
    traddr: 192.168.6.15
    sectype: none
    =====Discovery Log Entry 3======
    trtype: tcp
    adrfam: ipv4
    subtype: nvme subsystem
    treq: not specified
    portid: 0
    trsvcid: 4420
    subnqn: nqn.1992-08.com.netapp:sn.1c6ac66338e711eda41dd039ea3ad566:subsystem.host_95
    traddr: 192.168.6.17
    sectype: none
    ..........
  2. Verify that the other NVMe/TCP initiator-target LIF combinations are able to successfully fetch discovery log page data.

    nvme discover -t tcp -w host-traddr -a traddr

    Example output:

    # nvme discover -t tcp -w 192.168.5.13 -a 192.168.5.15
    # nvme discover -t tcp -w 192.168.5.13 -a 192.168.5.17
    # nvme discover -t tcp -w 192.168.6.13 -a 192.168.6.15
    # nvme discover -t tcp -w 192.168.6.13 -a 192.168.6.17
  3. Run the nvme connect-all command across all the supported NVMe/TCP initiator-target LIFs across the nodes, and set the controller loss timeout period for at least 30 minutes or 1800 seconds:

    nvme connect-all -t tcp -w host-traddr -a traddr -l 1800

    Example output:

    # nvme connect-all -t tcp -w 192.168.5.13 -a 192.168.5.15 -l 1800
    # nvme connect-all -t tcp -w 192.168.5.13 -a 192.168.5.17 -l 1800
    # nvme connect-all -t tcp -w 192.168.6.13 -a 192.168.6.15 -l 1800
    # nvme connect-all -t tcp -w 192.168.6.13 -a 192.168.6.17 -l 1800

Validate NVMe-oF

You can use the following procedure to validate NVMe-oF.

Steps
  1. Verify the following NVMe/FC settings on the OL 9.0 host:

    # cat /sys/module/nvme_core/parameters/multipath
    Y
    # cat /sys/class/nvme-subsystem/nvme-subsys*/model
    NetApp ONTAP Controller
    NetApp ONTAP Controller
    # cat /sys/class/nvme-subsystem/nvme-subsys*/iopolicy
    round-robin
    round-robin
  2. Verify that the namespaces are created and correctly discovered on the host:

    # nvme list

    Example output:

    Node         SN                   Model
    ---------------------------------------------------------
    /dev/nvme0n1 814vWBNRwf9HAAAAAAAB NetApp ONTAP Controller
    /dev/nvme0n2 814vWBNRwf9HAAAAAAAB NetApp ONTAP Controller
    /dev/nvme0n3 814vWBNRwf9HAAAAAAAB NetApp ONTAP Controller
    
    
    Namespace Usage    Format             FW             Rev
    -----------------------------------------------------------
    1                 85.90 GB / 85.90 GB  4 KiB + 0 B   FFFFFFFF
    2                 85.90 GB / 85.90 GB  24 KiB + 0 B  FFFFFFFF
    3                 85.90 GB / 85.90 GB  4 KiB + 0 B   FFFFFFFF
  3. Verify that the controller state of each path is live and has the correct ANA status:

    # nvme list-subsys /dev/nvme0n1

    Example output:

    nvme-subsys0 - NQN=nqn.1992-08.com.netapp:sn.5f5f2c4aa73b11e9967e00a098df41bd:subsystem.nvme_ss_ol_1
    \
    +- nvme0 fc traddr=nn-0x203700a098dfdd91:pn-0x203800a098dfdd91 host_traddr=nn-0x200000109b1c1204:pn-0x100000109b1c1204 live inaccessible
    +- nvme1 fc traddr=nn-0x203700a098dfdd91:pn-0x203900a098dfdd91 host_traddr=nn-0x200000109b1c1204:pn-0x100000109b1c1204 live inaccessible
    +- nvme2 fc traddr=nn-0x203700a098dfdd91:pn-0x203a00a098dfdd91 host_traddr=nn-0x200000109b1c1205:pn-0x100000109b1c1205 live optimized
    +- nvme3 fc traddr=nn-0x203700a098dfdd91:pn-0x203d00a098dfdd91 host_traddr=nn-0x200000109b1c1205:pn-0x100000109b1c1205 live optimized
  4. Verify that the NetApp plug-in displays the correct values for each ONTAP namespace device:

    # nvme netapp ontapdevices -o column

    Example output:

    Device        Vserver   Namespace Path
    ----------------------- ------------------------------
    /dev/nvme0n1   vs_ol_nvme  /vol/ol_nvme_vol_1_1_0/ol_nvme_ns
    /dev/nvme0n2   vs_ol_nvme  /vol/ol_nvme_vol_1_0_0/ol_nvme_ns
    /dev/nvme0n3   vs_ol_nvme  /vol/ol_nvme_vol_1_1_1/ol_nvme_ns
    
    
    NSID       UUID                                   Size
    ------------------------------------------------------------
    1          72b887b1-5fb6-47b8-be0b-33326e2542e2   85.90GB
    2          04bf9f6e-9031-40ea-99c7-a1a61b2d7d08   85.90GB
    3          264823b1-8e03-4155-80dd-e904237014a4   85.90GB
    # nvme netapp ontapdevices -o json
    {
    "ONTAPdevices" : [
        {
            "Device" : "/dev/nvme0n1",
            "Vserver" : "vs_ol_nvme",
            "Namespace_Path" : "/vol/ol_nvme_vol_1_1_0/ol_nvme_ns",
            "NSID" : 1,
            "UUID" : "72b887b1-5fb6-47b8-be0b-33326e2542e2",
            "Size" : "85.90GB",
            "LBA_Data_Size" : 4096,
            "Namespace_Size" : 20971520
        },
        {
            "Device" : "/dev/nvme0n2",
            "Vserver" : "vs_ol_nvme",
            "Namespace_Path" : "/vol/ol_nvme_vol_1_0_0/ol_nvme_ns",
            "NSID" : 2,
            "UUID" : "04bf9f6e-9031-40ea-99c7-a1a61b2d7d08",
            "Size" : "85.90GB",
            "LBA_Data_Size" : 4096,
            "Namespace_Size" : 20971520
          },
          {
             "Device" : "/dev/nvme0n3",
             "Vserver" : "vs_ol_nvme",
             "Namespace_Path" : "/vol/ol_nvme_vol_1_1_1/ol_nvme_ns",
             "NSID" : 3,
             "UUID" : "264823b1-8e03-4155-80dd-e904237014a4",
             "Size" : "85.90GB",
             "LBA_Data_Size" : 4096,
             "Namespace_Size" : 20971520
           },
      ]
    }

Known issues

The NVMe-oF host configuration for Oracle Linux 9.0 with ONTAP has the following known issues:

NetApp Bug ID Title Description Bugzilla ID

1517321

Oracle Linux 9.0 NVMe-oF Hosts create duplicate Persistent Discovery Controllers

On Oracle Linux 9.0 NVMe over Fabrics (NVMe-oF) hosts, you can use the nvme discover -p command to create Persistent Discovery Controllers (PDCs). When this command is used, only one PDC should be created per initiator-target combination. However, if you are running ONTAP 9.10.1 and Oracle Linux 9.0 with an NVMe-oF host, a duplicate PDC is created each time nvme discover -p is executed. This leads to unnecessary usage of resources on both the host and the target.

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