Cray System Management Documentation > Cray System Management (CSM) Administration Guide > node management > Check and Set the metal.no-wipe Setting on NCNs

Check and Set the `metal.no-wipe` Setting on NCNs

Configure the metal.no-wipe setting on non-compute nodes (NCNs) to preserve data on the nodes before doing an NCN reboot.

Run the ncnGetXnames.shscript to view the metal.no-wipe settings for each NCN. The component name (xname) and metal.no-wipe settings are also dumped out when executing the /opt/cray/platform-utils/ncnHealthChecks.sh script.

Prerequisites

This procedure requires administrative privileges.

Procedure

(ncn-mw#) Run the ncnGetXnames.sh script.

The output will end with a listing of all of the NCNs, their component names (xnames), and what the metal.no-wipe setting is for each.
```
/opt/cray/platform-utils/ncnGetXnames.sh
```
Example of the NCN listing at the end of the output:
```
ncn-m001: x3000c0s1b0n0 - metal.no-wipe=1
ncn-m002: x3000c0s2b0n0 - metal.no-wipe=1
ncn-m003: x3000c0s3b0n0 - metal.no-wipe=1
ncn-w001: x3000c0s4b0n0 - metal.no-wipe=1
ncn-w002: x3000c0s5b0n0 - metal.no-wipe=1
ncn-w003: x3000c0s6b0n0 - metal.no-wipe=1
ncn-s001: x3000c0s7b0n0 - metal.no-wipe=1
ncn-s002: x3000c0s8b0n0 - metal.no-wipe=1
ncn-s003: x3000c0s9b0n0 - metal.no-wipe=1
```
The metal.no-wipe setting must be set to 1 (that is, metal.no-wipe=1) if doing a reboot of an NCN, in order to preserve the current data on it. If it is not set to 1 when the NCN is rebooted, then the NCN will be completely wiped and will subsequently have to be rebuilt. If the metal.no-wipe status for one or more NCNs is not returned, then re-run the ncnGetXnames.sh script.

(ncn-m001#) Reset the metal.no-wipe settings for any NCN where it is set to 0.

This step can be skipped if the metal.no-wipe is already set to 1 for any NCNs being rebooted.

Generate an API token and export it.

export TOKEN=$(curl -k -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')

Update the metal.no-wipe settings.

csi handoff bss-update-param --set metal.no-wipe=1

Run the ncnGetXnames.sh script again to verify the metal.no-wipe settings have been updated as expected.