SAN hosts and cloud clients manuals ( CA08872-021 )

Configure Oracle Linux 9x with NVMe-oF for ONTAP storage

Oracle Linux hosts support the NVMe over Fibre Channel (NVMe/FC) and NVMe over TCP (NVMe/TCP) protocols with Asymmetric Namespace Access (ANA). ANA provides multipathing functionality equivalent to asymmetric logical unit access (ALUA) in iSCSI and FCP environments.

Learn how to configure NVMe over Fabrics (NVMe-oF) hosts for Oracle Linux 9x. For more support and feature information, see Oracle Linux ONTAP support and features.

NVMe-oF with Oracle Linux 9x has the following known limitations:

SAN booting using the NVMe-oF protocol is not supported.
The nvme disconnect-all command disconnects both root and data filesystems and might lead to system instability. Do not issue this on systems booting from SAN over NVMe-TCP or NVMe-FC namespaces.

Step 1: Optionally, enable SAN booting

You can configure your host to use SAN booting to simplify deployment and improve scalability.

Steps

Create a SAN boot namespace and map it to the host.
Enable SAN booting in the server BIOS for the ports to which the SAN boot namespace is mapped.

For information on how to enable the HBA BIOS, see your vendor-specific documentation.
Verify that the configuration was successful by rebooting the host and verifying that the OS is up and running.

Step 2: Install Oracle Linux and NVMe software and verify your configuration

Use the following procedure to validate the minimum supported Oracle Linux 9x software versions.

Steps

Install Oracle Linux 9x on the server. After the installation is complete, verify that you are running the specified Oracle Linux 9x kernel.
```
uname -r
```
Example Oracle Linux kernel version:
```
5.15.0-302.167.6.el9uek.x86_64
```
Install the nvme-cli package:
```
rpm -qa|grep nvme-cli
```
The following example shows an nvme-cli package version:
```
nvme-cli-2.9.1-6.el9.x86_64
```
Install the libnvme package:
```
rpm -qa|grep libnvme
```
The following example shows an libnvme package version:
```
libnvme-1.9-3.el9.x86_64
```
On the Oracle Linux 9x host, check the hostnqn string at /etc/nvme/hostnqn:
```
cat /etc/nvme/hostnqn
```
The following example shows an hostnqn version:
```
nqn.2014-08.org.nvmexpress:uuid:4c4c4544-0050-3410-8035-c2c04f4a5933
```

On the ONTAP system, verify that the hostnqn string matches the hostnqn string for the corresponding subsystem on the ONTAP storage system:

vserver nvme subsystem host show -vserver vs_213_36002

Show example

Vserver Subsystem Priority  Host NQN
------- --------- --------  ------------------------------------------------
vs_coexistence_LPE36002
        nvme1
                  regular   nqn.2014-08.org.nvmexpress:uuid:4c4c4544-0050-3410-8035-c2c04f4a5933
        nvme2
                  regular   nqn.2014-08.org.nvmexpress:uuid:4c4c4544-0050-3410-8035-c2c04f4a5933
        nvme3
                  regular   nqn.2014-08.org.nvmexpress:uuid:4c4c4544-0050-3410-8035-c2c04f4a5933
        nvme4
                  regular   nqn.2014-08.org.nvmexpress:uuid:4c4c4544-0050-3410-8035-c2c04f4a5933
4 entries were displayed.

If the hostnqn strings don’t 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.

Step 3: Configure NVMe/FC and NVMe/TCP

Configure NVMe/FC with Broadcom/Emulex or Marvell/QLogic adapters, or configure NVMe/TCP using manual discovery and connect operations.

FC - Broadcom/Emulex

Configure NVMe/FC for a Broadcom/Emulex adapter.

Verify that you’re using the supported adapter model:

Display the model names:

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

You should see the following output:

LPe36002-M64
LPe36002-M64

Display the model descriptions:

cat /sys/class/scsi_host/host*/modeldesc

You should see an output similar to the following example:

Emulex LightPulse LPe36002-M64 2-Port 64Gb Fibre Channel Adapter
Emulex LightPulse LPe36002-M64 2-Port 64Gb Fibre Channel Adapter

Verify that you are using the recommended Broadcom lpfc firmware and inbox driver:
1. Display the firmware version:
  cat /sys/class/scsi_host/host*/fwrev
  The following example shows firmware versions:
  14.4.393.25, sli-4:6:d 14.4.393.25, sli-4:6:d
2. Display the inbox driver version:
  cat /sys/module/lpfc/version
  The following example shows a driver version:
  0:14.4.0.2

Verify that lpfc_enable_fc4_type is set to 3:

cat /sys/module/lpfc/parameters/lpfc_enable_fc4_type

Verify that you can view your initiator ports:
```
cat /sys/class/fc_host/host*/<port_name>
```
The following example shows port identities:
```
0x100000620b3c089c
0x100000620b3c089d
```
Verify that your initiator ports are online:
```
cat /sys/class/fc_host/host*/port_state
```
You should see the following output:
```
Online
Online
```

Verify that the NVMe/FC initiator ports are enabled and that the target ports are visible:

cat /sys/class/scsi_host/host*/nvme_info

Show example

NVME Initiator Enabled
XRI Dist lpfc0 Total 6144 IO 5894 ELS 250
NVME LPORT lpfc0 WWPN x100000620b3c089c WWNN x200000620b3c089c DID x081300 ONLINE
NVME RPORT       WWPN x2001d039eab0dadc WWNN x2000d039eab0dadc DID x080101 TARGET DISCSRVC ONLINE
NVME RPORT       WWPN x2003d039eab0dadc WWNN x2000d039eab0dadc DID x080401 TARGET DISCSRVC ONLINE

NVME Statistics
LS: Xmt 00000002e9 Cmpl 00000002e9 Abort 00000000
LS XMIT: Err 00000000  CMPL: xb 00000000 Err 00000000
Total FCP Cmpl 0000000000078742 Issue 0000000000078740 OutIO fffffffffffffffe
        abort 000000c2 noxri 00000000 nondlp 00000a23 qdepth 00000000 wqerr 00000000 err 00000000
FCP CMPL: xb 000000c2 Err 00000238

NVME Initiator Enabled
XRI Dist lpfc1 Total 6144 IO 5894 ELS 250
NVME LPORT lpfc1 WWPN x100000620b3c089d WWNN x200000620b3c089d DID x081900 ONLINE
NVME RPORT       WWPN x2002d039eab0dadc WWNN x2000d039eab0dadc DID x080201 TARGET DISCSRVC ONLINE
NVME RPORT       WWPN x2004d039eab0dadc WWNN x2000d039eab0dadc DID x080301 TARGET DISCSRVC ONLINE

NVME Statistics
LS: Xmt 00000002d9 Cmpl 00000002d9 Abort 00000000
LS XMIT: Err 00000000  CMPL: xb 00000000 Err 00000000
Total FCP Cmpl 000000000007754f Issue 000000000007754f OutIO 0000000000000000
        abort 000000c2 noxri 00000000 nondlp 00000719 qdepth 00000000 wqerr 00000000 err 00000000
FCP CMPL: xb 000000c2 Err 0000023d

FC - Marvell/QLogic

Configure NVMe/FC for a Marvell/QLogic adapter.

Verify that you are running the supported adapter driver and firmware versions:
```
cat /sys/class/fc_host/host*/symbolic_name
```
The follow example shows driver and firware versions:
```
QLE2772 FW:v9.15.03 DVR:v10.02.09.300-k-debug
```
Verify that ql2xnvmeenable is set. This enables the Marvell adapter to function as an NVMe/FC initiator:
```
cat /sys/module/qla2xxx/parameters/ql2xnvmeenable
```
The expected output is 1.

TCP

The NVMe/TCP protocol doesn’t support the auto-connect operation. Instead, you can discover the NVMe/TCP subsystems and namespaces by performing the NVMe/TCP connect or connect-all operations manually.

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

Show example

nvme discover -t tcp -w 192.168.165.3 -a 192.168.165.8
Discovery Log Number of Records 8, Generation counter 8
=====Discovery Log Entry 0======
trtype:  tcp
adrfam:  ipv4
subtype: current discovery subsystem
treq:    not specified
portid:  4
trsvcid: 8009
subnqn:  nqn.1992-08.com.netapp:sn.4f7af2bd221811f0afadd039eab0dadd:discovery
traddr:  192.168.166.9
eflags:  explicit discovery connections, duplicate discovery information
sectype: none
=====Discovery Log Entry 1======
trtype:  tcp
adrfam:  ipv4
subtype: current discovery subsystem
treq:    not specified
portid:  2
trsvcid: 8009
subnqn:  nqn.1992-08.com.netapp:sn.4f7af2bd221811f0afadd039eab0dadd:discovery
traddr:  192.168.165.9
eflags:  explicit discovery connections, duplicate discovery information
sectype: none
=====Discovery Log Entry 2======
trtype:  tcp
adrfam:  ipv4
subtype: current discovery subsystem
treq:    not specified
portid:  3
trsvcid: 8009
subnqn:  nqn.1992-08.com.netapp:sn.4f7af2bd221811f0afadd039eab0dadd:discovery
traddr:  192.168.166.8
eflags:  explicit discovery connections, duplicate discovery information
sectype: none
=====Discovery Log Entry 3======
trtype:  tcp
adrfam:  ipv4
subtype: current discovery subsystem
treq:    not specified
portid:  1
trsvcid: 8009
subnqn:  nqn.1992-08.com.netapp:sn.4f7af2bd221811f0afadd039eab0dadd:discovery
traddr:  192.168.165.8
eflags:  explicit discovery connections, duplicate discovery information
sectype: none
=====Discovery Log Entry 4======
trtype:  tcp
adrfam:  ipv4
subtype: nvme subsystem
treq:    not specified
portid:  4
trsvcid: 4420
subnqn:  nqn.1992-08.com.netapp:sn.4f7af2bd221811f0afadd039eab0dadd:subsystem.nvme
traddr:  192.168.166.9
eflags:  none
sectype: none
=====Discovery Log Entry 5======
trtype:  tcp
adrfam:  ipv4
subtype: nvme subsystem
treq:    not specified
portid:  2
trsvcid: 4420
subnqn:  nqn.1992-08.com.netapp:sn.4f7af2bd221811f0afadd039eab0dadd:subsystem.nvme
traddr:  192.168.165.9
eflags:  none
sectype: none
=====Discovery Log Entry 6======
trtype:  tcp
adrfam:  ipv4
subtype: nvme subsystem
treq:    not specified
portid:  3
trsvcid: 4420
subnqn:  nqn.1992-08.com.netapp:sn.4f7af2bd221811f0afadd039eab0dadd:subsystem.nvme
traddr:  192.168.166.8
eflags:  none
sectype: none
=====Discovery Log Entry 7======
trtype:  tcp
adrfam:  ipv4
subtype: nvme subsystem
treq:    not specified
portid:  1
trsvcid: 4420
subnqn:  nqn.1992-08.com.netapp:sn.4f7af2bd221811f0afadd039eab0dadd:subsystem.nvme
traddr:  192.168.165.8
eflags:  none
sectype: none

Verify that the other NVMe/TCP initiator-target LIF combinations can successfully fetch discovery log page data:

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

Show example

nvme discover -t tcp -w 192.168.166.4 -a 192.168.166.8
nvme discover -t tcp -w 192.168.165.3 -a 192.168.165.8
nvme discover -t tcp -w 192.168.166.4 -a 192.168.166.9
nvme discover -t tcp -w 192.168.165.3 -a 192.168.165.9

Run the nvme connect-all command across all the supported NVMe/TCP initiator-target LIFs across the nodes:

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

Show example

nvme connect-all -t	tcp -w 192.168.165.3 -a 192.168.165.8
nvme connect-all -t	tcp -w 192.168.165.3 -a 192.168.165.9
nvme connect-all -t	tcp -w 192.168.166.4 -a 192.168.166.8
nvme connect-all -t	tcp -w 192.168.166.4 -a 192.168.166.9

Beginning with Oracle Linux 9.4, the setting for the NVMe/TCP ctrl_loss_tmo timeout is automatically set to "off". As a result:

There are no limits on the number of retries (indefinite retry).
You don’t need to manually configure a specific ctrl_loss_tmo timeout duration when using the nvme connect or nvme connect-all commands (option -l ).
The NVMe/TCP controllers don’t experience timeouts in the event of a path failure and remain connected indefinitely.

Step 4: Optionally, enable 1MB I/O for NVMe/FC

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

These steps don’t apply to Qlogic NVMe/FC hosts.

Steps

Set the lpfc_sg_seg_cnt parameter to 256:
```
cat /etc/modprobe.d/lpfc.conf
```
You should see an output similar to the following example:
```
options lpfc lpfc_sg_seg_cnt=256
```
Run the dracut -f command, and reboot the host.

Verify that the value for lpfc_sg_seg_cnt is 256:

cat /sys/module/lpfc/parameters/lpfc_sg_seg_cnt

Step 5: Verify NVMe boot services

Beginning with Oracle Linux 9.5, the nvmefc-boot-connections.service and nvmf-autoconnect.service boot services included in the NVMe/FC nvme-cli package are automatically enabled when the system boots.

After booting completes, verify that the nvmefc-boot-connections.service and nvmf-autoconnect.service boot services are enabled.

Steps

Verify that nvmf-autoconnect.service is enabled:

systemctl status nvmf-autoconnect.service

Show example output

nvmf-autoconnect.service - Connect NVMe-oF subsystems automatically during boot
Loaded: loaded (/usr/lib/systemd/system/nvmf-autoconnect.service; enabled; preset: disabled)
Active: inactive (dead) since Wed 2025-07-02 16:46:37 IST; 1 day 3h ago
Main PID: 2129 (code=exited, status=0/SUCCESS)
CPU: 121ms

Jul 02 16:46:37 interop-13-175 nvme[2129]: Failed to write to /dev/nvme-fabrics: Invalid argument
Jul 02 16:46:37 interop-13-175 nvme[2129]: Failed to write to /dev/nvme-fabrics: Invalid argument
Jul 02 16:46:37 interop-13-175 nvme[2129]: Failed to write to /dev/nvme-fabrics: Invalid argument
Jul 02 16:46:37 interop-13-175 nvme[2129]: Failed to write to /dev/nvme-fabrics: Invalid argument
Jul 02 16:46:37 interop-13-175 nvme[2129]: Failed to write to /dev/nvme-fabrics: Invalid argument
Jul 02 16:46:37 interop-13-175 nvme[2129]: Failed to write to /dev/nvme-fabrics: Invalid argument
Jul 02 16:46:37 interop-13-175 nvme[2129]: Failed to open ctrl nvme0, errno 2
Jul 02 16:46:37 interop-13-175 nvme[2129]: failed to get discovery log: Bad file descriptor
Jul 02 16:46:37 interop-13-175 systemd[1]: nvmf-autoconnect.service: Deactivated successfully.
Jul 02 16:46:37 interop-13-175 systemd[1]: Finished Connect NVMe-oF subsystems automatically during boot.

Verify that nvmefc-boot-connections.service is enabled:

systemctl status nvmefc-boot-connections.service

Show example output

nvmefc-boot-connections.service - Auto-connect to subsystems on FC-NVME devices found during boot
Loaded: loaded (/usr/lib/systemd/system/nvmefc-boot-connections.service; enabled; preset: enabled)
Active: inactive (dead) since Wed 2025-07-02 16:45:46 IST; 1 day 3h ago
Main PID: 1604 (code=exited, status=0/SUCCESS)
CPU: 32ms

Jul 02 16:45:46 interop-13-175 systemd[1]: Starting Auto-connect to subsystems on FC-NVME devices found during boot...
Jul 02 16:45:46 interop-13-175 systemd[1]: nvmefc-boot-connections.service: Deactivated successfully.
Jul 02 16:45:46 interop-13-175 systemd[1]: Finished Auto-connect to subsystems on FC-NVME devices found during boot.

Step 6: Verify the multipathing configuration

Verify that the in-kernel NVMe multipath status, ANA status, and ONTAP namespaces are correct for the NVMe-oF configuration.

Steps

Verify that the in-kernel NVMe multipath is enabled:
```
cat /sys/module/nvme_core/parameters/multipath
```
You should see the following output:
```
Y
```
Verify that the appropriate NVMe-oF settings (such as, model set to ONTAP Controller and load balancing iopolicy set to round-robin) for the respective ONTAP namespaces correctly reflect on the host:
1. Display the subsystems:
  cat /sys/class/nvme-subsystem/nvme-subsys*/model
  You should see the following output:
  NetApp ONTAP Controller NetApp ONTAP Controller
2. Display the policy:
  cat /sys/class/nvme-subsystem/nvme-subsys*/iopolicy
  You should see the following output:
  round-robin round-robin

Verify that the namespaces are created and correctly discovered on the host:

nvme list

Show example

Node          Generic       SN                   Model                     Namespace  Usage                   Format         FW Rev
------------- ------------- -------------------- ------------------------- ---------- ----------------------- -------------- --------
/dev/nvme1n1  /dev/ng1n1    81Mc4FXd1tocAAAAAAAC NetApp ONTAP Controller   0x1        0.00   B /  10.74  GB   4 KiB +  0 B   9.16.1

Verify that the controller state of each path is live and has the correct ANA status:

NVMe/FC

nvme list-subsys /dev/nvme4n5

Show example

nvme-subsys7 - NQN=nqn.1992-08.com.netapp:sn.7d37987be3cb11ef8948d039eab0dadd:subsystem.nvme6
               hostnqn=nqn.2014-08.org.nvmexpress:uuid:2831093d-fa7f-4714-a6bf-548796e82053
               iopolicy=round-robin
\
 +- nvme103 fc traddr=nn-0x202cd039eab0dadc:pn-0x202fd039eab0dadc,host_traddr=nn-0x200034800d767bb0:pn-0x210034800d767bb0 live optimized
 +- nvme153 fc traddr=nn-0x202cd039eab0dadc:pn-0x202ed039eab0dadc,host_traddr=nn-0x200034800d767bb1:pn-0x210034800d767bb1 live non-optimized
 +- nvme55 fc traddr=nn-0x202cd039eab0dadc:pn-0x202dd039eab0dadc,host_traddr=nn-0x200034800d767bb0:pn-0x210034800d767bb0 live non-optimized
 +- nvme7 fc traddr=nn-0x202cd039eab0dadc:pn-0x2030d039eab0dadc,host_traddr=nn-0x200034800d767bb1:pn-0x210034800d767bb1 live optimized

NVMe/TCP

nvme list-subsys /dev/nvme1n1

Show example

nvme-subsys1 - NQN=nqn.1992-08.com.netapp:sn.4f7af2bd221811f0afadd039eab0dadd:subsystem.nvme
               hostnqn=nqn.2014-08.org.nvmexpress:uuid:9796c1ec-0d34-11eb-b6b2-3a68dd3bab57
               iopolicy=round-robin\
+- nvme1 tcp traddr=192.168.165.8,trsvcid=4420,host_traddr=192.168.165.3,
src_addr=192.168.165.3 live optimized
+- nvme2 tcp traddr=192.168.165.9,trsvcid=4420,host_traddr=192.168.165.3,
src_addr=192.168.165.3 live non-optimized
+- nvme3 tcp traddr=192.168.166.8,trsvcid=4420,host_traddr=192.168.166.4,
src_addr=192.168.166.4 live optimized
+- nvme4 tcp traddr=192.168.166.9,trsvcid=4420,host_traddr=192.168.166.4,
src_addr=192.168.166.4 live non-optimized

Verify that the plug-in displays the correct values for each ONTAP namespace device:

Column

nvme netapp ontapdevices -o column

Show example

Device           Vserver                   Namespace Path                                     NSID UUID                                   Size
---------------- ------------------------- -------------------------------------------------- ---- -------------------------------------- ---------
/dev/nvme1n1     vs_tcpinband              /vol/volpdc/ns1                                    1    80eec226-6987-4eb4-bf86-65bf48c5372d   10.74GB

JSON

nvme netapp ontapdevices -o json

Show example

{
  "ONTAPdevices":[
    {
      "Device":"/dev/nvme1n1",
      "Vserver":"vs_tcpinband",
      "Namespace_Path":"/vol/volpdc/ns1",
      "NSID":1,
      "UUID":"80eec226-6987-4eb4-bf86-65bf48c5372d",
      "Size":"10.74GB",
      "LBA_Data_Size":4096,
      "Namespace_Size":2621440
    }
  ]
}

Step 7: Set up secure in-band authentication

Secure in-band authentication is supported over NVMe/TCP between a Oracle Linux 9x host and an ONTAP controller.

Each host or controller must be associated with a DH-HMAC-CHAP key to set up secure authentication. A DH-HMAC-CHAP key is a combination of the NQN of the NVMe host or controller and an authentication secret configured by the administrator. To authenticate its peer, an NVMe host or controller must recognize the key associated with the peer.

Set up secure in-band authentication using the CLI or a config JSON file. Use a config JSON file if you need to specify different dhchap keys for different subsystems.

CLI

Set up secure in-band authentication using the CLI.

Obtain the host NQN:
```
cat /etc/nvme/hostnqn
```

Generate the dhchap key for the Linux host.

The following output describes the gen-dhchap-key command paramters:

nvme gen-dhchap-key -s optional_secret -l key_length {32|48|64} -m HMAC_function {0|1|2|3} -n host_nqn
•	-s secret key in hexadecimal characters to be used to initialize the host key
•	-l length of the resulting key in bytes
•	-m HMAC function to use for key transformation
0 = none, 1- SHA-256, 2 = SHA-384, 3=SHA-512
•	-n host NQN to use for key transformation

In the following example, a random dhchap key with HMAC set to 3 (SHA-512) is generated.

# nvme gen-dhchap-key -m 3 -n nqn.2014-08.org.nvmexpress:uuid:9796c1ec-0d34-11eb-b6b2-3a68dd3bab57
DHHC-1:03:Y5VkkESgmtTGNdX842qemNpFK6BXYVwwnqErgt3IQKP5Fbjje\/JSBOjG5Ea3NBLRfuiAuUSDUto6eY\/GwKoRp6AwGkw=:

On the ONTAP controller, add the host and specify both dhchap keys:

vserver nvme subsystem host add -vserver <svm_name> -subsystem <subsystem> -host-nqn <host_nqn> -dhchap-host-secret <authentication_host_secret> -dhchap-controller-secret <authentication_controller_secret> -dhchap-hash-function {sha-256|sha-512} -dhchap-group {none|2048-bit|3072-bit|4096-bit|6144-bit|8192-bit}

A host supports two types of authentication methods, unidirectional and bidirectional. On the host, connect to the ONTAP controller and specify dhchap keys based on the chosen authentication method:
```
nvme connect -t tcp -w <host-traddr> -a <tr-addr> -n <host_nqn> -S <authentication_host_secret> -C <authentication_controller_secret>
```

Validate the nvme connect authentication command by verifying the host and controller dhchap keys:

Verify the host dhchap keys:

cat /sys/class/nvme-subsystem/<nvme-subsysX>/nvme*/dhchap_secret

Show example output for a unidirectional configuration

cat /sys/class/nvme-subsystem/nvme-subsys1/nvme*/dhchap_secret
DHHC-1:03:Y5VkkESgmtTGNdX842qemNpFK6BXYVwwnqErgt3IQKP5Fbjje\/JSBOjG5Ea3NBLRfuiAuUSDUto6eY\/GwKoRp6AwGkw=:
DHHC-1:03:Y5VkkESgmtTGNdX842qemNpFK6BXYVwwnqErgt3IQKP5Fbjje\/JSBOjG5Ea3NBLRfuiAuUSDUto6eY\/GwKoRp6AwGkw=:
DHHC-1:03:Y5VkkESgmtTGNdX842qemNpFK6BXYVwwnqErgt3IQKP5Fbjje\/JSBOjG5Ea3NBLRfuiAuUSDUto6eY\/GwKoRp6AwGkw=:
  DHHC-  1:03:Y5VkkESgmtTGNdX842qemNpFK6BXYVwwnqErgt3IQKP5Fbjje\/JSBOjG5Ea3NBLRfuiAuUSDUto6eY\/GwKoRp6AwGkw=:

Verify the controller dhchap keys:

cat /sys/class/nvme-subsystem/<nvme-subsysX>/nvme*/dhchap_ctrl_secret

Show example output for a bidirectional configuration

cat /sys/class/nvme-subsystem/nvme-subsys6/nvme*/dhchap_ctrl_secret
DHHC-1:03:frpLlTrnOYtcWDxPzq4ccxU1UrH2FjV7hYw5s2XEDB+lo+TjMsOwHR\/NFtM0nBBidx+gdoyUcC5s6hOOtTLDGcz0Kbs=:
DHHC-1:03:frpLlTrnOYtcWDxPzq4ccxU1UrH2FjV7hYw5s2XEDB+lo+TjMsOwHR\/NFtM0nBBidx+gdoyUcC5s6hOOtTLDGcz0Kbs=:
DHHC-1:03:frpLlTrnOYtcWDxPzq4ccxU1UrH2FjV7hYw5s2XEDB+lo+TjMsOwHR\/NFtM0nBBidx+gdoyUcC5s6hOOtTLDGcz0Kbs=:
DHHC-1:03:frpLlTrnOYtcWDxPzq4ccxU1UrH2FjV7hYw5s2XEDB+lo+TjMsOwHR\/NFtM0nBBidx+gdoyUcC5s6hOOtTLDGcz0Kbs=:

JSON

When multiple NVMe subsystems are available on the ONTAP controller configuration, you can use the /etc/nvme/config.json file with the nvme connect-all command.

Use the -o option to generate the JSON file. See the NVMe connect-all manual pages for more syntax options.

Configure the JSON file:

Show example

 cat /etc/nvme/config.json
[
  {
    "hostnqn":"nqn.2014-08.org.nvmexpress:uuid:9796c1ec-0d34-11eb-b6b2-3a68dd3bab57",
    "hostid":"9796c1ec-0d34-11eb-b6b2-3a68dd3bab57",
    "dhchap_key":"DHHC-1:03:Y5VkkESgmtTGNdX842qemNpFK6BXYVwwnqErgt3IQKP5Fbjje\/JSBOjG5Ea3NBLRfuiAuUSDUto6eY\/GwKoRp6AwGkw=:",
    "subsystems":[
      {
        "nqn":"nqn.1992-08.com.netapp:sn.4f7af2bd221811f0afadd039eab0dadd:subsystem.nvme",
        "ports":[
          {
            "transport":"tcp",
            "traddr":"192.168.165.9",
            "host_traddr":"192.168.165.3",
            "trsvcid":"4420",
            "dhchap_key":"DHHC-1:03:Y5VkkESgmtTGNdX842qemNpFK6BXYVwwnqErgt3IQKP5Fbjje\/JSBOjG5Ea3NBLRfuiAuUSDUto6eY\/GwKoRp6AwGkw=:",
            "dhchap_ctrl_key":"DHHC-1:03:frpLlTrnOYtcWDxPzq4ccxU1UrH2FjV7hYw5s2XEDB+lo+TjMsOwHR\/NFtM0nBBidx+gdoyUcC5s6hOOtTLDGcz0Kbs=:"          },
          {
            "transport":"tcp",
            "traddr":"192.168.166.9",
            "host_traddr":"192.168.166.4",
            "trsvcid":"4420",
                        "dhchap_key":"DHHC-1:03:Y5VkkESgmtTGNdX842qemNpFK6BXYVwwnqErgt3IQKP5Fbjje\/JSBOjG5Ea3NBLRfuiAuUSDUto6eY\/GwKoRp6AwGkw=:",
            "dhchap_ctrl_key":"DHHC-1:03:frpLlTrnOYtcWDxPzq4ccxU1UrH2FjV7hYw5s2XEDB+lo+TjMsOwHR\/NFtM0nBBidx+gdoyUcC5s6hOOtTLDGcz0Kbs=:"
          },
          {
            "transport":"tcp",
            "traddr":"192.168.166.8",
            "host_traddr":"192.168.166.4",
            "trsvcid":"4420",
                        "dhchap_key":"DHHC-1:03:Y5VkkESgmtTGNdX842qemNpFK6BXYVwwnqErgt3IQKP5Fbjje\/JSBOjG5Ea3NBLRfuiAuUSDUto6eY\/GwKoRp6AwGkw=:",
            "dhchap_ctrl_key":"DHHC-1:03:frpLlTrnOYtcWDxPzq4ccxU1UrH2FjV7hYw5s2XEDB+lo+TjMsOwHR\/NFtM0nBBidx+gdoyUcC5s6hOOtTLDGcz0Kbs=:"
          },
          {
            "transport":"tcp",
            "traddr":"192.168.165.8",
            "host_traddr":"192.168.165.3",
            "trsvcid":"4420",
                        "dhchap_key":"DHHC-1:03:Y5VkkESgmtTGNdX842qemNpFK6BXYVwwnqErgt3IQKP5Fbjje\/JSBOjG5Ea3NBLRfuiAuUSDUto6eY\/GwKoRp6AwGkw=:",
            "dhchap_ctrl_key":"DHHC-1:03:frpLlTrnOYtcWDxPzq4ccxU1UrH2FjV7hYw5s2XEDB+lo+TjMsOwHR\/NFtM0nBBidx+gdoyUcC5s6hOOtTLDGcz0Kbs=:"
          }
        ]
      }
    ]
  }
]

In the preceding example, dhchap_key corresponds to dhchap_secret and dhchap_ctrl_key corresponds to dhchap_ctrl_secret.

Connect to the ONTAP controller using the config JSON file:
```
nvme connect-all -J /etc/nvme/config.json
```

Verify that the dhchap secrets have been enabled for the respective controllers for each subsystem:

Verify the host dhchap keys:

cat /sys/class/nvme-subsystem/nvme-subsys0/nvme0/dhchap_secret

The following example shows a dhchap key:

DHHC-1:03:Y5VkkESgmtTGNdX842qemNpFK6BXYVwwnqErgt3IQKP5Fbjje\/JSBOjG5Ea3NBLRfuiAuUSDUto6eY\/GwKoRp6AwGkw=:

Verify the controller dhchap keys:

cat /sys/class/nvme-subsystem/nvme-subsys0/nvme0/dhchap_ctrl_secret

You should see an output similar to the following example:

DHHC-1:03:frpLlTrnOYtcWDxPzq4ccxU1UrH2FjV7hYw5s2XEDB+lo+TjMsOwHR\/NFtM0nBBidx+gdoyUcC5s6hOOtTLDGcz0Kbs=:

SAN hosts and cloud clients manuals ( CA08872-021 )

Configure Oracle Linux 9x with NVMe-oF for ONTAP storage

Step 1: Optionally, enable SAN booting

Step 2: Install Oracle Linux and NVMe software and verify your configuration

Step 3: Configure NVMe/FC and NVMe/TCP

Step 4: Optionally, enable 1MB I/O for NVMe/FC

Step 5: Verify NVMe boot services

Step 6: Verify the multipathing configuration

Step 7: Set up secure in-band authentication

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