Caution
When deactivating CNodes, make sure to maintain the following ratios to maintain cluster viability and data availability:
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For larger clusters, at least 2 fully operational CNodes must be available for every 20 operational DNodes.
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For smaller clusters, at least 1 fully operational CNode must be available.
Before deactivating a CNode, confirm that the vippools using this CNode contain at least one another CNode which is not running VMS
Perform this procedure if you need to replace a CNode. This requires powering off the CNode and removing it from the CBox chassis.
Note
To request a field replacement unit (FRU) for a faulty component, contact VAST Data Support.
This replacement procedure uses the power off and replace features in VMS.
When the procedure is complete:
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Passwords that were configured on the removed CNode are configured on the replacement CNode.
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Network settings are configured on the replacement CNode to match the network configuration of the removed CNode.
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SSH keys are updated on the replacement CNode
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The VAST OS is updated to the correct version.
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Power off the CNode using one of the following methods:
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From the VAST Web UI:
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From the VAST CLI:
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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 | 192.0.2.21 | fe80::9a03:9bff:fe8f:ba4c | 192.0.2.11 | c-128-21 | ACTIVE | True | build-as-orion-96399-835783 | Yes | vast42 | 12.8.16 | cbox-501023 | 14 | a4:bf:01:5c: | 2 | cnode-128-22 | 192.0.2.22 | fe80::a6bf:1ff:fe5c:eaa4 | 192.0.2.13 | c-128-22 | ACTIVE | True | build-as-orion-96399-835783 | No | vast42 | 12.9.1 | cbox-501023 | 14 | a4:bf:01:5c: | 3 | cnode-128-23 | 192.0.2.23 | fe80::9a03:9bff:fe8f:ba44 | 192.0.2.15 | c-128-23 | ACTIVE | True | build-as-orion-96399-835783 | No | vast42 | 12.8.16 | cbox-501023 | 14 | a4:bf:01:5c: +----+--------------+--------------+---------------------------+-------------+-----------+--------+---------+----------------------------------------+------------+------------+------------+-------------+-------+-------------
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Run the following command with the applicable ID. For example, if you are replacing the failed CNode above:
vcli: admin> CNode deactivate --id 2 --power-off
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The power off option deactivates and powers off the CNode. The CNode state transitions to DEACTIVATING and then to INACTIVE.
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Monitor the modify_CNode activity:
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From the VAST Web UI: Go the Activities page and check the state of the modify_CNode activity.
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From the VAST CLI: run
vtask list
and check the state of the modify_CNode activity.
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When the state of the modify_CNode activity is COMPLETED, disconnect all QSFP28 and RJ-45 cables from the CNode.
Label the cables if needed so that you will be able to reconnect the cables to the same ports on the replacement CNode after replacement. e.g. If the QSFP28 cables are not labeled, label the left and right cables before disconnecting.
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Remove the CNode.
Note
The procedure to remove a CNode blank or a CNode is similar
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Disconnect all peripheral cables from the CNode.
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While holding the CNode handle (1), press the retention latch (2) in the direction shown in the image below, to release the CNode.
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Pull the CNode handle (1) to pull the CNode out of the bay.
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Insert the replacement CNode.
Caution
To avoid any damage to the pins on the CNode, do not force the sled into the CNode bay. Follow the two-position insertion and carefully slide the CNode into the bay.
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Using the CNode handle (1), slowly slide the CNode inwards until it locks into place.
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Reconnect the QSFP28 and RJ-45 cables to the ports to which they were previously connected.
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When the cables are connected and the CNode state is ACTIVE, do one of the following:
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From the VAST Web UI:
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Run the following command with the applicable ID:
vcli: admin> CNode activate --id ID --replace
Note
If any other CNode or CNode in the cluster is known to be in a non-active state, or if one of a CNode's or CNode's data network ports is disconnected from the switch, then add the additional parameter
--skip-network-validation
.That is, run this command:
vcli: admin> CNode activate --id ID --replace --skip-network-validation
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The replace process now updates the passwords, serial number, network configuration, SSH keys, and OS version.
The CNode begins to power on automatically. It transitions from INACTIVE to ACTIVATING and then to ACTIVE.
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Monitor the modify_CNode activity again.
When the replacement is complete, the modify_CNode activity is reported as COMPLETED.
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