Removing CNodes

This procedure removes an active CNode from a cluster, and powers it down, in preparation for removal from the rack.

Removing the CNode

1. Power off the CNode using one of the following methods:

   • From the VAST Web UI:

     1. From the left menu, select Infrastructure and then CNodes.

     2. On the CNodes list, right-click the CNode you want to replace and select Power off.

   • From the VCLI:

     1. Identify the ID of the CNode you want to replace:

        vcli: admin> cnode list
        +----+--------------+--------------+---------------------------+-------------+-----------+--------+---------+----------------------------------------+------------+------------+------------+-------------+-------+-------------
        | ID | Name         | IP           | IPv6                      | Mgmt-ip     | Host Name | State  | Enabled | Build                                  | Management | Cluster    | OS-Version | CBox        | Cores | Serial
        +----+--------------+--------------+---------------------------+-------------+-----------+--------+---------+----------------------------------------+------------+------------+------------+-------------+-------+-------------
        | 1  | cnode-128-21 | 10.10.128.21 | fe80::9a03:9bff:fe8f:ba4c | 10.55.21.11 | c-128-21  | ACTIVE | True    | build-as-orion-96399-835783 | Yes        | vast42-kfs | 12.8.16    | cbox-501023 | 14    | a4:bf:01:5c:
        | 2  | cnode-128-22 | 10.10.128.22 | fe80::a6bf:1ff:fe5c:eaa4  | 10.55.21.13 | c-128-22  | ACTIVE | True    | build-as-orion-96399-835783 | No         | vast42-kfs | 12.9.1     | cbox-501023 | 14    | a4:bf:01:5c:
        | 3  | cnode-128-23 | 10.10.128.23 | fe80::9a03:9bff:fe8f:ba44 | 10.55.21.15 | c-128-23  | ACTIVE | True    | build-as-orion-96399-835783 | No         | vast42-kfs | 12.8.16    | cbox-501023 | 14    | a4:bf:01:5c:
        +----+--------------+--------------+---------------------------+-------------+-----------+--------+---------+----------------------------------------+------------+------------+------------+-------------+-------+-------------

     2. Run the following command with the relevant ID. For example, if you are replacing the failed CNode above:

        vcli: admin> cnode deactivate --id 2 --power-off

   The power off option deactivates and powers off the CNode. The CNode state transitions to DEACTIVATING and then to INACTIVE.

2. Monitor the modify_cnode activity:

   • From the VAST Web UI: Go the Activities page and check the state of the modify_cnode activity.

   • From the VCLI: run vtask list and check the state of the modify_cnode activity.

3. When the state of the modify_cnode activity is COMPLETED, disconnect all QSFP28 and RJ-45 cables from the CNode.

4. Remove the CNode from the cluster:

   • From the VAST Web UI, in the Infrastructure page, right-click on the CNode and select Delete.

   • In the VCLI run this command:        

     vcli: admin> cnode remove --id ID

5. Remove the CNode.

   To remove a CNode from an Ice Lake (HPE) model CBox:

   1. Disconnect all peripheral cables from the server.

   2. Loosen the release lever thumbscrew (1) by turning it counter clockwise.

   3. Pull the release lever to pull the server out of the bay (2).