Replace an HPE Cray EX liquid-cooled compute blade.
The Cray command line interface (CLI) tool is initialized and configured on the system. See Configure the Cray Command Line Interface.
The Slingshot fabric must be configured with the desired topology.
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.
The blades must have the coolant drained and filled during the swap to minimize cross-contamination of cooling systems.
The System Admin Toolkit (SAT) is installed and configured on the system.
DVS must be running over the HSN.
Verify that the workload manager (WLM) is not using the affected nodes.
(ncn-mw#) Determine which Boot Orchestration Service (BOS) templates to use to shut down nodes on the target blade.
There will be separate session templates for UANs and computes nodes.
List all the session templates.
If it is unclear which session template is in use, proceed to the next substep.
cray bos v1 sessiontemplate list
Find the node xnames with sat status. In this example, the target blade is in slot x9000c3s0.
sat status --filter 'xname=x9000c3s0*'
Example output:
+---------------+------+----------+-------+------+---------+------+-------+-------------+----------+
| xname | Type | NID | State | Flag | Enabled | Arch | Class | Role | Net |
+---------------+------+----------+-------+------+---------+------+-------+-------------+----------+
| x9000c3s0b1n0 | Node | 1 | Off | OK | True | X86 | River | Compute | Sling |
| x9000c3s0b2n0 | Node | 2 | Off | OK | True | X86 | River | Compute | Sling |
| x9000c3s0b3n0 | Node | 3 | Off | OK | True | X86 | River | Compute | Sling |
| x9000c3s0b4n0 | Node | 4 | Off | OK | True | X86 | River | Compute | Sling |
+---------------+------+----------+-------+------+---------+------+-------+-------------+----------+
Find the bos_session value for each node via the Configuration Framework Service (CFS).
cray cfs components describe x9000c3s0b1n0 --format toml | grep bos_session
Example output:
bos_session = "e98cdc5d-3f2d-4fc8-a6e4-1d301d37f52f"
Find the required templateName value with BOS.
cray bos v1 session describe BOS_SESSION --format toml | grep templateName
Example output:
templateName = "compute-nid1-4-sessiontemplate"
Determine the list of xnames associated with the desired boot session template.
cray bos v1 sessiontemplate describe SESSION_TEMPLATE_NAME --format toml | grep node_list
Example output:
node_list = [ "x9000c3s0b1n0", "x9000c3s0b2n0", "x9000c3s0b3n0", "x9000c3s0b4n0",]
(ncn-mw#) Shut down the nodes on the target blade.
Use the sat bootsys command to shut down the nodes on the target blade. Specify the appropriate component name (xname)
for the slot, and a comma-separated list of the BOS session templates determined in the previous step.
BOS_TEMPLATES=cos-2.0.30-slurm-healthy-compute
sat bootsys shutdown --stage bos-operations --bos-limit x9000c3s0 --recursive --bos-templates $BOS_TEMPLATES
Power off the slot and delete blade information from HSM.
(ncn-mw#) Use the sat swap command to power off the slot and delete the blade’s Ethernet interfaces and Redfish endpoints from HSM.
sat swap blade --action disable x9000c3s0
Replace the blade hardware.
Review the Remove a Compute Blade Using the Lift procedure in HPE Cray EX Hardware Replacement Procedures H-6173 for detailed instructions.
CAUTION: Always power off the chassis slot or device before removal. The best practice is to unlatch and unseat the device while the coolant hoses are still connected, then disconnect the coolant hoses. If this is not possible, disconnect the coolant hoses, then quickly unlatch/unseat the device (within 10 seconds). Failure to do so may damage the equipment.
(ncn-mw#) Use the sat swap command to begin discovery for the blade and add it to hardware management.
sat swap blade --action enable x9000c3s0
(ncn-mw#) Set the environment variable SLOT to the blade’s location.
SLOT="x9000c3s0"
(ncn-mw#) Clear the Redfish event subscriptions.
export TOKEN=$(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')
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#) Optional: If necessary, update the firmware.
Review the Firmware Action Service (FAS) documentation.
cray fas actions create CUSTOM_DEVICE_PARAMETERS.json
(ncn-mw#) Power on and boot the nodes.
Use sat bootsys to power on and boot the nodes. Specify the appropriate BOS template for the node type.
BOS_TEMPLATE=cos-2.0.30-slurm-healthy-compute
sat bootsys boot --stage bos-operations --bos-limit x9000c3s0 --recursive --bos-templates $BOS_TEMPLATE