Cray System Management Documentation > Cray System Management (CSM) Administration Guide > node management > Adding a Liquid-cooled Blade to a System

Adding a Liquid-cooled Blade to a System

This procedure will add a liquid-cooled blades to an HPE Cray EX system.

Prerequisites

Add a blade to a cabinet using CANI using CANI.
The Cray command line interface (CLI) tool is initialized and configured on the system. See Configure the Cray CLI.
Knowledge of whether Data Virtualization Service (DVS) is operating over the Node Management Network (NMN) or the High Speed Network (HSN).
Blade is being added to an existing liquid-cooled cabinet in the system.
The Slingshot fabric must be configured with the desired topology for desired state of the blades in the system.
The System Layout Service (SLS) must have the desired HSN configuration.
Check the status of the high-speed network (HSN) and record link status before the procedure.

(ncn-mw#) Review the following command examples.

The following commands can be used to capture the required values from the Hardware State Manager (HSM) ethernetInterfaces table and write the values to a file, which can then be used to automate subsequent commands in this procedure.

mkdir blade_swap_scripts; cd blade_swap_scripts
cat blade_query.sh

Example output:

#!/bin/bash
BLADE=$1
OUTFILE=$2

BLADE_DOT=$BLADE.

cray hsm inventory ethernetInterfaces list --format json | jq -c --arg BLADE "$BLADE_DOT" \
    'map(select(.ComponentID|test($BLADE))) | map(select(.Description == "Node Maintenance Network")) | .[] | {xname: .ComponentID, ID: .ID,MAC: .MACAddress, IP: .IPAddresses[0].IPAddress,Desc: .Description}' > $OUTFILE

./blade_query.sh x1000c0s1 x1000c0s1.json
cat x1000c0s1.json

Example output:

{"xname":"x1000c0s1b0n0","ID":"0040a6836339","MAC":"00:40:a6:83:63:39","IP":"10.100.0.10","Desc":"Node Maintenance Network"}
{"xname":"x1000c0s1b0n1","ID":"0040a683633a","MAC":"00:40:a6:83:63:3a","IP":"10.100.0.98","Desc":"Node Maintenance Network"}
{"xname":"x1000c0s1b1n0","ID":"0040a68362e2","MAC":"00:40:a6:83:62:e2","IP":"10.100.0.123","Desc":"Node Maintenance Network"}
{"xname":"x1000c0s1b1n1","ID":"0040a68362e3","MAC":"00:40:a6:83:62:e3","IP":"10.100.0.122","Desc":"Node Maintenance Network"}

To delete anethernetInterfaces entry using curl:

for ID in $(cat x1000c0s1.json | jq -r '.ID'); do cray hsm inventory ethernetInterfaces delete $ID; done

To insert an ethernetInterfaces entry using curl:

while read PAYLOAD ; do
    curl -H "Authorization: Bearer $TOKEN" -L -X POST 'https://api-gw-service-nmn.local/apis/smd/hsm/v2/Inventory/EthernetInterfaces' \
        -H 'Content-Type: application/json' \
        --data-raw "$(echo $PAYLOAD | jq -c '{ComponentID: .xname,Description: .Desc,MACAddress: .MAC,IPAddresses: [{IPAddress: .IP}]}')"
    sleep 5
done < x1000c0s1.json

The blades must have the coolant drained and filled during the swap to minimize cross-contamination of cooling systems.
- Review procedures in HPE Cray EX Coolant Service Procedures H-6199.
- Review the HPE Cray EX Hand Pump User Guide H-6200.

Procedure

(ncn-mw#) Suspend the hms-discovery cron job to disable it.

kubectl -n services patch cronjobs hms-discovery -p '{"spec" : {"suspend" : true }}'

Verify that the hms-discovery cron job has stopped.

kubectl get cronjobs -n services hms-discovery

Example output. Note the ACTIVE = 0 and is SUSPEND = True in the output indicating the job has been suspended:

NAME             SCHEDULE        SUSPEND     ACTIVE   LAST   SCHEDULE  AGE
hms-discovery    */3 * * * *     True         0       117s             15d

(ncn-mw#) Determine if the destination chassis slot is populated.

This example is checking slot 0 in chassis 3 of cabinet x1005.
```
cray hsm state components describe x1005c3s0 --format toml
```
Example output:
```
ID = "x1005c3s0"
Type = "ComputeModule"
State = "Empty"
Flag = "OK"
Enabled = true
NetType = "Sling"
Arch = "X86"
Class = "Mountain"
```
If the state of the slot is On or Off, then the chassis slot is populated. If the state of the slot is Empty, then the chassis slot is not populated.

(ncn-mw#) Verify that the chassis slot is powered off.

Skip this step if the chassis slot is unpopulated.

cray power status describe x1005c3s0 --format toml

Example output:

[[status]]
xname = "x1005c3s0"
powerState = "on"
managementState = "available"
error = ""
supportedPowerTransitions = [ "On", "Force-Off", "Soft-Off", "Off", "Init", "Hard-Restart", "Soft-Restart",]
lastUpdated = "2024-02-04T01:48:48.3156272Z"

If the slot is powered on, then power the chassis slot off.

cray power transition off --xnames x1005c3s0 --include children

Install the blade into the system into the desired location.

(ncn-mw#) Obtain an authentication token to access the API gateway.

export TOKEN=$(curl -s -S -d grant_type=client_credentials \
            -d client_id=admin-client \
            -d client_secret=`kubectl get secrets admin-client-auth -o jsonpath='{.data.client-secret}' | base64 -d` \
            https://api-gw-service-nmn.local/keycloak/realms/shasta/protocol/openid-connect/token | jq -r '.access_token')

Preserve node component name (xname) to IP address mapping

(ncn-mw#) Skip this step if DVS is operating over the HSN, otherwise proceed with this step.

When DVS is operating over the NMN and a blade is being replaced, the mapping of node component name (xname) to node IP address must be preserved. Kea automatically adds entries to the HSM ethernetInterfaces table when DHCP lease is provided (about every 5 minutes). To prevent from Kea from automatically adding MAC entries to the HSM ethernetInterfaces table, use the following commands:
1. Create an eth_interfaces file that contains the interface IDs for the Node Maintenance Network entries for the destination blade location. If there has not been a blade previously in the destination location there may not be any Ethernet Interfaces to delete from HSM. The blade_query.sh script from the prerequisites section can help determine the IDs for the HSM Ethernet Interfaces associated with the blade if any. It is expected that if a blade has not been populated in the slot before that no HSM Ethernet Interfaces IDs would be found.
```
cat eth_interfaces
```
  Example output:
```
0040a6836339
0040a683633a
0040a68362e2
0040a68362e3
```
2. Run the following commands in succession to remove the interfaces if any.
  
  Delete the cray-dhcp-kea pod to prevent the interfaces from being re-created.
```
kubectl get pods -Ao wide | grep kea
kubectl delete -n services pod CRAY_DHCP_KEA_PODNAME
for ETH in $(cat eth_interfaces); do cray hsm inventory ethernetInterfaces delete $ETH --format json ; done
```
3. Skip this step if the destination blade location has not been previously populated with a blade.
  
  Add the MAC address, IP address, and the Node Maintenance Network description to the interfaces. The component ID and IP address must be the values recorded from the blade previously in the destination location, and the MAC address must be the value recorded from the blade. These values were recorded if the blade was removed via the Removing a Liquid-cooled blade from a System procedure.
  
  Values recorded from the blade that was was previously in the slot.
```
ComponentID: "x1005c3s0b0n0"
MACAddress: "00:40:a6:83:63:99"
IPAddress: "10.10.0.123"
```
```
MAC=NEW_BLADE_MAC_ADDRESS
IP_ADDRESS=DESTLOCATION_IP_ADDRESS
XNAME=DESTLOCATION_XNAME

curl -H "Authorization: Bearer ${TOKEN}" -L -X POST 'https://api-gw-service-nmn.local/apis/smd/hsm/v2/Inventory/EthernetInterfaces' -H 'Content-Type: application/json' --data-raw "{
    \"Description\": \"Node Maintenance Network\",
    \"MACAddress\": \"$MAC\",
    \"IPAddresses\": [
        {
            \"IPAddress\": \"$IP_ADDRESS\"
        }
    ],
    \"ComponentID\": \"$XNAME\"
}"
```
  NOTE Kea may must be restarted when the curl command is issued.
```
kubectl delete pods -n services -l app.kubernetes.io/name=cray-dhcp-kea
```
  To change or correct a curl command that has been entered, use a PATCH request, for example:
```
curl -k -H "Authorization: Bearer $TOKEN" -L -X PATCH \
    'https://api-gw-service-nmn.local/apis/smd/hsm/v2/Inventory/EthernetInterfaces/0040a68350a4' -H 'Content-Type: application/json' \
    --data-raw '{"MACAddress":"xx:xx:xx:xx:xx:xx","IPAddresses":[{"IPAddress":"10.xxx.xxx.xxx"}],"ComponentID":"XNAME"}'
```
4. Repeat the preceding command for each node in the blade.

Re-enable `hms-discovery` cron job

(ncn-mw#) Rediscover the ChassisBMC (the example shows cabinet 1005, chassis 3).

Rediscovering the ChassisBMC will update HSM to become aware of the newly populated slot and allow Power Control Service (PCS) to perform power actions on the slot.
```
cray hsm inventory discover create --xnames x1005c3b0
```

(ncn-mw#) Verify that discovery of the ChassisBMC has completed.

That is, verify that LastDiscoveryStatus = DiscoverOK.

cray hsm inventory redfishEndpoints describe x1005c3b0 --format json

Example output:

{
    "ID": "x1005c3b0",
    "Type": "ChassisBMC",
    "Hostname": "x1005c3b0",
    "Domain": "",
    "FQDN": "x1005c3b0",
    "Enabled": true,
    "User": "root",
    "Password": "",
    "MACAddr": "02:03:ED:03:00:00",
    "RediscoverOnUpdate": true,
    "DiscoveryInfo": {
        "LastDiscoveryAttempt": "2020-09-03T19:03:47.989621Z",
        "LastDiscoveryStatus": "DiscoverOK",
        "RedfishVersion": "1.2.0"
    }
}

(ncn-mw#) Unsuspend the hms-discovery cronjob to re-enable the hms-discovery job.

kubectl -n services patch cronjobs hms-discovery -p '{"spec" : {"suspend" : false }}'

(ncn-mw#) Verify that the hms-discovery job has been unsuspended.

kubectl get cronjobs.batch -n services hms-discovery

Example output.

ACTIVE = 1 and SUSPEND = False in the output indicates that the job has been unsuspended:

NAME             SCHEDULE      SUSPEND   ACTIVE   LAST   SCHEDULE  AGE
hms-discovery    */3 * * * *   False       1      41s              33d

Enable and power on the chassis slot

(ncn-mw#) Enable the chassis slot.

The example enables slot 0, chassis 3, in cabinet 1005.
```
cray hsm state components enabled update --enabled true x1005c3s0
```
(ncn-mw#) Power on the chassis slot.

The example powers on slot 0, chassis 3, in cabinet 1005.
```
cray power transition on --xnames x1005c3s0 --include children
```
Wait at least three minutes for the blade to power on and the node controllers (BMCs) to be discovered.

Verify that discovery has completed

(ncn-mw#) Verify that the two node BMCs in the blade have been discovered by the HSM.

Run this command for each BMC in the blade (x1005c3s0b0 and x1005c3s0b1 in this example):
```
cray hsm inventory redfishEndpoints describe x1005c3s0b0 --format json
```
Example output:
```
{
    "ID": "x1005c3s0b0",
    "Type": "NodeBMC",
    "Hostname": "x1005c3s0b0",
    "Domain": "",
    "FQDN": "x1005c3s0b0",
    "Enabled": true,
    "User": "root",
    "Password": "",
    "MACAddr": "02:03:E8:00:31:00",
    "RediscoverOnUpdate": true,
    "DiscoveryInfo": {
        "LastDiscoveryAttempt": "2021-06-10T18:01:59.920850Z",
        "LastDiscoveryStatus": "DiscoverOK",
        "RedfishVersion": "1.2.0"
    }
}
```
- When LastDiscoveryStatus displays as DiscoverOK, the node BMC has been successfully discovered.
- If the last discovery state is DiscoveryStarted then the BMC is currently being inventoried by HSM.
- If the last discovery state is HTTPsGetFailed or ChildVerificationFailed, then an error has occurred during the discovery process.
Troubleshooting:
- If the Redfish endpoint does not exist for a BMC, then verify the following:
  1. (ncn-mw#) Verify that the node BMC is pingable:
```
ping x1005c3s0b0
```
  2. (ncn-mw#) If the BMC is not pingable, then verify that the chassis slot has power.
```
cray power status describe x1005c3s0
```
- If the Redfish endpoint is in HTTPsGetFailed:
  1. (ncn-mw#) Verify that the node BMC is pingable:
```
ping x1005c3s0b0
```
  2. (ncn-mw#) If the BMC is pingable, then verify that the node BMC is configured with the expected credentials.
```
curl -k -u root:password https://x1005c3s0b0/redfish/v1/Managers
```

(ncn-mw#) Clear out the existing Redfish event subscriptions from the BMCs on the blade.

Set the environment variable SLOT to the blade’s location.
```
SLOT="x1005c3s0"
```

Clear the Redfish event subscriptions.

for BMC in $(cray hsm inventory  redfishEndpoints list --type NodeBMC --format json | jq .RedfishEndpoints[].ID -r | grep ${SLOT}); do
    /usr/share/doc/csm/scripts/operations/node_management/delete_bmc_subscriptions.py $BMC
done

Each BMC on the blade will have output like the following:

Clearing subscriptions from NodeBMC x3000c0s9b0
Retrieving BMC credentials from SCSD
Retrieving Redfish Event subscriptions from the BMC: https://x3000c0s9b0/redfish/v1/EventService/Subscriptions
Deleting event subscription: https://x3000c0s9b0/redfish/v1/EventService/Subscriptions/1
Successfully deleted https://x3000c0s9b0/redfish/v1/EventService/Subscriptions/1

(ncn-mw#) Enable the nodes in the HSM database.

For a blade with four nodes per blade:

cray hsm state components bulkEnabled update --enabled true --component-ids x1005c3s0b0n0,x1005c3s0b0n1,x1005c3s0b1n0,x1005c3s0b1n1

For a blade with two nodes per blade:

cray hsm state components bulkEnabled update --enabled true --component-ids x1005c3s0b0n0,x1005c3s0b1n0

Verify that the nodes are enabled in the HSM.

cray hsm state components query create --component-ids x1005c3s0b0n0,x1005c3s0b0n1,x1005c3s0b1n0,x1005c3s0b1n1 --format toml

Partial example output:

[[Components]]
ID = x1005c3s0b0n0
Type = "Node"
Enabled = true
State = "Off"

[[Components]]
ID = x1005c3s0b1n1
Type = "Node"
Enabled = true
State = "Off"

Power on and boot the nodes

Use boot orchestration to power on and boot the nodes. Specify the appropriate Boot Orchestration Service (BOS) template for the node type.

(ncn-mw#) Determine how the BOS session template references compute hosts.

Typically, they are referenced by their Compute role. However, if they are referenced by component name (xname), then these new nodes should added to the BOS session template.
```
BOS_TEMPLATE=cos-2.0.30-slurm-healthy-compute
cray bos v2 sessiontemplates describe $BOS_TEMPLATE --format json|jq '.boot_sets[] | select(.node_list)'
```
- If this query returns empty, then skip to booting the nodes.
- If this query returns with data, then one or more boot sets within the BOS session template reference nodes explicitly by xname. Consider adding the new nodes to this list (sub-step 1) or adding them on the command line (sub-step 2).
1. (ncn-mw#) Add new nodes to the list.
  1. Dump the current session template.
    
    The name field cannot be present in the file, or else the subsequent command to create the Session template will fail. The jq command in the following example strips out this field.
```
cray bos v2 sessiontemplates describe $BOS_TEMPLATE --format json | jq 'del(.name)' > tmp.txt
```
  2. Edit the tmp.txt file, adding the new nodes to the node_list.
2. (ncn-mw#) Create the session template.
  1. Set the name of the template.
    
    The name of the session template is determined by the name provided to the --name option on the command line. Use the current value of $BOS_TEMPLATE if wanting to overwrite the existing session template. If wanting to use the current value, then skip this sub-step. Otherwise, provide a different name for BOS_TEMPLATE which will be used the --name option. The name specified in tmp.txt is overridden by the value provided to the --name option.
```
BOS_TEMPLATE="New-Session-Template-Name"
```
  2. Create the session template.
```
cray bos v2 sessiontemplates create --file tmp.txt $BOS_TEMPLATE
```
  3. Verify that the session template contains the additional nodes and the proper name.
```
cray bos v2 sessiontemplates describe $BOS_TEMPLATE --format json
```
3. (ncn-mw#) Boot the nodes.
```
cray bos v2 sessions create --template-name $BOS_TEMPLATE \
     --operation reboot --limit x1005c3s0b0n0,x1005c3s0b0n1,x1005c3s0b1n0,x1005c3s0b1n1
```

Check firmware

Use Firmware Action Service (FAS) to verify that the correct firmware versions are present for node BIOS, node controller (nC), NIC Mezzanine Card (NMC), GPUs, and so on.
1. Review FAS Admin Procedures to perform a dry run using FAS to verify firmware versions.
2. If necessary update firmware with FAS. See Update Firmware with FAS for more information.

Check DVS

There should be one or more cray-cps pods.

(ncn-mw#) Verify that the cray-cps pods on worker nodes are Running.

kubectl get pods -Ao wide | grep cps

Example output:

services   cray-cps-75cffc4b94-j9qzf    2/2  Running   0   42h 10.40.0.57  ncn-w001

(ncn-w#) SSH to each worker node running Content Projection Service (CPS)/DVS, and ensure that there are no recurring "DVS: merge_one" error messages as shown.

If found, these error messages indicate that DVS is detecting an IP address change for one of the client nodes.

dmesg -T | grep "DVS: merge_one"

Example output:

[Tue Jul 21 13:09:54 2020] DVS: merge_one#351: New node map entry does not match the existing entry
[Tue Jul 21 13:09:54 2020] DVS: merge_one#353:   nid: 8 -> 8
[Tue Jul 21 13:09:54 2020] DVS: merge_one#355:   name: 'x3000c0s19b1n0' -> 'x3000c0s19b1n0'
[Tue Jul 21 13:09:54 2020] DVS: merge_one#357:   address: '10.252.0.26@tcp99' -> '10.252.0.33@tcp99'
[Tue Jul 21 13:09:54 2020] DVS: merge_one#358:   Ignoring.

(ncn-mw#) If the "DVS: merge_one" error messages is shown, then the IP address of the node needs to be corrected. This will prevent the need to reload DVS.

Set the following environment variables based on the output collected in the previous step.

NODE_XNAME=x3000c0s19b1n0
CURRENT_IP_ADDRESS=10.252.0.33
DESIRED_IP_ADDRESS=10.252.0.26

Determine the HSM EthernetInterface entry holding onto the desired IP address.

cray hsm inventory ethernetInterfaces list --ip-address "${DESIRED_IP_ADDRESS}" --output toml

If no EthernetInterfaces are found, then continue on to the next step.

Example output:
```
results = []
```

If an EthernetInterface is found, then it needs to be removed from HSM.

Example output:

[[results]]
ID = "b42e99dfecf0"
Description = "Ethernet Interface Lan2"
MACAddress = "b4:2e:99:df:ec:f0"
LastUpdate = "2022-08-08T10:10:57.527819Z"
ComponentID = "x3000c0s17b2n0"
Type = "Node"
[[results.IPAddresses]]
IPAddress = "10.252.1.26"

Record the returned ID value into the EI_ID environment variable.
```
OLD_EI_ID=b42e99dfecf0
```

Delete the EthernetInterfaces from HSM.

cray hsm inventory ethernetInterfaces delete ${OLD_EI_ID}

Determine the HSM EthernetInterface entry holding onto the current IP address.

cray hsm inventory ethernetInterfaces list --component-id "${NODE_XNAME}" --ip-address "${CURRENT_IP_ADDRESS}" --output toml

Example output:

[[results]]
ID = "b42e99dff35f"
Description = "Ethernet Interface Lan1"
MACAddress = "b4:2e:99:df:f3:5f"
LastUpdate = "2022-08-18T16:38:21.13173Z"
ComponentID = "x3000c0s17b1n0"
Type = "Node"
[[results.IPAddresses]]
IPAddress = "10.252.1.69"

Record the returned ID value into the EI_ID environment variable.

CURRENT_EI_ID=b42e99dff35f

Update the EthernetInterface to have the desired IP address:

cray hsm inventory ethernetInterfaces update "$CURRENT_EI_ID" --component-id "${NODE_XNAME}" --ip-addresses--ip-address "${DESIRED_IP_ADDRESS}"

Reboot the node.

(nid#) SSH to the node and check each DVS mount.

mount | grep dvs | head -1

Example output:

/var/lib/cps-local/0dbb42538e05485de6f433a28c19e200 on /var/opt/cray/gpu/nvidia-squashfs-21.3 type dvs (ro,relatime,blksize=524288,statsfile=/sys/kernel/debug/dvs/mounts/1/stats,attrcache_timeout=14400,cache,nodatasync,noclosesync,retry,failover,userenv,noclusterfs,killprocess,noatomic,nodeferopens,no_distribute_create_ops,no_ro_cache,loadbalance,maxnodes=1,nnodes=6,nomagic,hash_on_nid,hash=modulo,nodefile=/sys/kernel/debug/dvs/mounts/1/nodenames,nodename=x3000c0s6b0n0:x3000c0s5b0n0:x3000c0s4b0n0:x3000c0s9b0n0:x3000c0s8b0n0:x3000c0s7b0n0)

Check the HSN for the affected nodes

(ncn-mw#) Determine the pod name for the Slingshot fabric manager pod and check the status of the fabric.

kubectl exec -it -n services $(kubectl get pods --all-namespaces |grep slingshot | awk '{print $2}') -- fmn_status

Check for duplicate IP address entries

(ncn-mw#) Check for duplicate IP address entries in the Hardware State Management Database (HSM).

Duplicate entries will cause DNS operations to fail.

Verify that each node hostname resolves to one IP address.

nslookup x1005c3s0b0n0

Example output with one IP address resolving:

Server:         10.92.100.225
Address:        10.92.100.225#53

Name:   x1005c3s0b0n0
Address: 10.100.0.26

Reload the Kea configuration.

curl -s -k -H "Authorization: Bearer ${TOKEN}" -X POST -H "Content-Type: application/json" -d '{ "command": "config-reload",  "service": [ "dhcp4" ] }' https://api-gw-service-nmn.local/apis/dhcp-kea |jq

If there are no duplicate IP addresses within HSM, then the following response is expected:

[
    {
    "result": 0,
    "text": "Configuration successful."
    }
]

If there is a duplicate IP address in the HSM, then an error message similar to the message below will be returned.

[{'result': 1, 'text': "Config reload failed: configuration error using file '/usr/local/kea/cray-dhcp-kea-dhcp4.conf': 
failed to add new host using the HW address '00:40:a6:83:50:a4 and DUID '(null)' to the IPv4 subnet id '0' for the 
address 10.100.0.105: There's already a reservation for this address"}]

(ncn-mw#) Check for active DHCP leases.

If there are no DHCP leases, then there is a configuration error.

curl -H "Authorization: Bearer ${TOKEN}" -X POST -H "Content-Type: application/json" \
    -d '{ "command": "lease4-get-all", "service": [ "dhcp4" ] }' https://api-gw-service-nmn.local/apis/dhcp-kea | jq

Example output with no active DHCP leases:

[
  {
    "arguments": {
      "leases": []
    },
    "result": 3,
    "text": "0 IPv4 lease(s) found."
  }
]

(ncn-mw#) If there are duplicate entries in the HSM as a result of this procedure (10.100.0.105 in this example), then delete the duplicate entry.

Show the EthernetInterfaces for the duplicate IP address:

cray hsm inventory ethernetInterfaces list --ip-address 10.100.0.105 --format json | jq

Example output for an IP address that is associated with two MAC addresses:

[
  {
    "ID": "0040a68350a4",
    "Description": "Node Maintenance Network",
    "MACAddress": "00:40:a6:83:50:a4",
    "IPAddress": "10.100.0.105",
    "LastUpdate": "2021-08-24T20:24:23.214023Z",
    "ComponentID": "x1005c3s0b0n0",
    "Type": "Node"
  },
  {
    "ID": "0040a683639a",
    "Description": "Node Maintenance Network",
    "MACAddress": "00:40:a6:83:63:9a",
    "IPAddress": "10.100.0.105",
    "LastUpdate": "2021-08-27T19:15:53.697459Z",
    "ComponentID": "x1005c3s0b0n0",
    "Type": "Node"
  }
]

Delete the older entry.

cray hsm inventory ethernetInterfaces delete 0040a68350a4

(ncn-mw#) Check DNS.

nslookup 10.100.0.105

Example output:

105.0.100.10.in-addr.arpa        name = nid001032-nmn.
105.0.100.10.in-addr.arpa        name = nid001032-nmn.local.
105.0.100.10.in-addr.arpa        name = x1005c3s0b0n0.
105.0.100.10.in-addr.arpa        name = x1005c3s0b0n0.local.

(ncn-mw#) Check SSH.
```
ssh x1005c3s0b0n0
```

Adding a Liquid-cooled Blade to a System

Prerequisites

Procedure

Preserve node component name (xname) to IP address mapping

Re-enable hms-discovery cron job

Enable and power on the chassis slot

Verify that discovery has completed

Power on and boot the nodes

Check firmware

Check DVS

Check the HSN for the affected nodes

Check for duplicate IP address entries

Re-enable `hms-discovery` cron job