This section explains how to increase the node-fault-tolerance level for your Qumulo cluster during node-add operations.
Reconfiguring Your Cluster’s Node-Fault-Tolerance Level
While in previous versions of Qumulo Core you couldn’t modify the node-fault-tolerance level for your cluster after creating it, in Qumulo Core 5.1.3 (and higher) you can increase the node-fault-tolerance level for an existing cluster during the cluster expansion process. In addition to this, in Qumulo Core 5.3.4 (and higher), you can change the data protection configuration to manage the disk- and node-fault-tolerance level during the cluster expansion process.
- We strongly recommend contacting the Qumulo Care team before proceeding with cluster expansion.
- In the following scenarios, Qumulo Core maximizes the usable capacity by default but offers the option to increase the node-fault-tolerance level during the node-add operation by means of a trade-off in the increase of usable capacity.
- Your cluster is already heterogeneous.
- Your cluster becomes heterogeneous after a node-add operation.
Cluster Expansion Scenarios
The following sections describe node-add scenarios for various cluster configurations. Identify the scenario that applies to the cluster expansion option that you selected during the purchasing process.
Your Cluster Won’t Support an Increased Node-Fault-Tolerance Level
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Follow the instructions in Add a New Node to an Existing Qumulo Cluster on Qumulo Care.
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Before you click Yes in the Add <N> nodes to cluster <MyCluster>? dialog box, check that the projected capacity matches the expected capacity.
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To monitor this process, click Cluster > Overview. On the Cluster page, in the protection status section, you can view the rebalance phase status and the estimated time to completion.
When the restriper completes the provisioning of additional usable capacity, the Data Protected section shows the same node-fault-tolerance level as before the node-add operation.
Your Cluster Will Support an Increased Node-Fault-Tolerance Level without a Trade-Off in the Increase of Usable Capacity
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Follow the instructions in Add a New Node to an Existing Qumulo Cluster on Qumulo Care.
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Before you click Yes in the Add <N> nodes to cluster <MyCluster>? dialog box, check that the projected capacity matches the expected capacity.
After the cluster expansion process finishes, Qumulo Core begins data protection reconfiguration automatically.
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To monitor this process, click Cluster > Overview. On the Cluster page, in the protection status section, you can view the rebalance phase status and the estimated time to completion.
When the restriper completes the provisioning of additional usable capacity and data protection reconfiguration, the Data Protected section shows the increased node-fault-tolerance level.
Your Cluster Will Support an Increased Node-Fault-Tolerance Level with a Trade-Off in the Increase of Usable Capacity
This scenario lets you choose one of the following strategies.
Maintain the Current Node-Fault-Tolerance Level
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Follow the instructions in Add a New Node to an Existing Qumulo Cluster on Qumulo Care.
-
Before you click Yes in the Add <N> nodes to cluster <MyCluster>? dialog box, check that the projected capacity matches the expected capacity.
-
To monitor this process, click Cluster > Overview. On the Cluster page, in the protection status section, you can view the rebalance phase status and the estimated time to completion.
When the restriper completes the provisioning of additional usable capacity, the Data Protected section shows the same node-fault-tolerance level as before the node-add operation.
Increase the Node-Fault-Tolerance Level
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To begin the node-add operation, contact the Qumulo Care team.
After the cluster expansion process finishes, Qumulo Core begins data protection reconfiguration automatically.
-
To monitor this process, click Cluster > Overview. On the Cluster page, in the protection status section, you can view the rebalance phase status and the estimated time to completion.
When the restriper completes the provisioning of additional usable capacity and data protection reconfiguration, the Data Protected section shows the increased node-fault-tolerance level.