Discovering and Connecting to Targets from Qlogic Hosts

The following procedure describes how to discover and connect to an NVMe/FC target from an Oracle Linux host using a Marvell Qlogic Fibre Channel adapter.

Ensure that the qla2xxx Qlogic module is installed and loaded.
```
modprobe -r qla2xxx
modprobe qla2xxx
```

Identify the WWNN and WWPN of the local and remote ports. Use the following command:

sudo dmesg | grep traddr

For example, the following shows a host with one local port and one remote ports:

sudo dmesg | grep traddr

[    6.139862] qla2xxx [0000:04:00.0]-ffff:0: register_localport: host-traddr=nn-0x200000109acfgcad:pn-0x100000109acfgcad on portID:10700
[    6.241762] qla2xxx [0000:04:00.0]-2102:0: qla_nvme_register_remote: traddr=nn-0x2014c146dc13a14b:pn-0x2015c146dc13a14b PortID:01050d

Run a discovery command to identify NVMe SSD devices available on the remote port. Use the following command format:

nvme discover --transport fc --traddr <rportwwnn>:<rportwwnp> --host-traddr <lportwwnn>:<lportwwnp>

In the previous, <rportwwnn> and <rportwwnp> are the remote port world wide namespace name and port, and <rportwwnn> and <rportwwnp> are the local world wide namespace name and port.

For example, the following command

# nvme discover --transport fc --traddr nn-0x2014c146dc13a14b:pn-0x2015c146dc13a14b --host-traddr nn-0x200000109acfgcad:pn-0x100000109acfgcad

Discovery Log Number of Records 1, Generation counter 2
=====Discovery Log Entry 0======
trtype:  fc
adrfam:  fibre-channel
subtype: nvme subsystem
treq:    not specified
portid:  0
trsvcid: none
subnqn:  nqn.1432-01.com.netapp:sn.c44dd3bsce4245edc1adc021cb11a0f6:test_qlogic
traddr:  nn-0x2014c146dc13a14b:pn-0x2015c146dc13a14b

Establish a connection to the device represented by the subnqn listed in the discovery response. Use the following command format:
```
nvme connect --transport fc --traddr <rportwwnn>:<rportwwnp> --host-traddr <lportwwnn>:<lportwwnp> -n <subnqn> -k <s>
```
In the previous,
- <rportwwnn> and <rportwwnp> are the remote port world wide namespace name and port,
- <rportwwnn> and <rportwwnp> are the local world wide namespace name and port,
- <subnqn> is the value of the subnqn parameter generated by the discovery command,
- <s> is the keep-alive time in seconds for the command to wait for a response from the remote NVMe device before the command generates a timeout message.
For example, the following command establishes a connection to a remote port with a 5 second timer.
```
nvme connect --transport fc --traddr nn-0x2014c146dc13a14b:pn-0x2015c146dc13a14b --host-traddr nn-0x200000109acfgcad:pn-0x100000109acfgcad -n nn-0x2014c146dc13a14b:pn-0x2015c146dc13a14b:test_qlogic -k 5 
```

Verify that the storage is now available for the host to use. For example:

nvme list -v
Subsystem        Subsystem-NQN                                                                                    Controllers
---------------- ------------------------------------------------------------------------------------------------ ----------------
nvme-subsys1     nqn.1432-01.com.netapp:sn.c44dd3bsce4245edc1adc021cb11a0f6:test_qlogic                             nvme1

Device   SN                   MN                                       FR       TxPort Asdress        Slot   Subsystem    Namespaces
-------- -------------------- ---------------------------------------- -------- ------ -------------- ------ ------------ ----------------
nvme1    81EYIJSh2VMMAAAAAAAB NetApp ONTAP Controller                  FFFFFFFF fc     traddr nn-0x2014c146dc13a14b:pn-0x2015c146dc13a14b,host-traddr nn-0x200000109acfgcad:pn-0x100000109acfgcad    nvme-subsys1 nvme1n1

Device       Generic      NSID       Usage                      Format           Controllers
------------ ------------ ---------- -------------------------- ---------------- ----------------
/dev/nvme1n1 /dev/ng1n1   0x1        107.37  GB / 107.37  GB      4 KiB +  0 B   nvme1