This section explains how to change your Qumulo cluster’s data protection configuration during node-add operations and how to monitor and reduce the impact of configuration changes on your cluster's workload.
Changing the Configuration of Your Cluster’s Data Protection
In Qumulo Core 5.3.4 (and higher), as you expand your cluster, it might become necessary to change the configuration its data protection, which specifies the disk-fault-tolerance and, when applicable, the storage efficiency of your cluster.
- Although you can also change the node-fault-tolerance level when you change the data protection configuration (to guarantee the same Mean Time to Data Loss threshold), this isn't mandatory.
- We strongly recommend contacting the Qumulo Care team before proceeding with cluster expansion. We can recommend the correct cluster expansion scenario to you.
Cluster Expansion Scenarios
The following sections describe two cluster expansion scenarios. Identify the scenario that applies to your cluster expansion plan.
Adding Nodes with Data Protection Reconfiguration
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To begin the process, contact the Qumulo Care team to discuss your cluster expansion needs. In addition, Qumulo Care can advise you how to:
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Reduce the impact of data protection reconfiguration on your primary workload by decreasing background resource consumption.
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Speed up the data protection reconfiguration process during off-peak time periods (with impact on your primary workload) by increasing background resource consumption.
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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 Qumulo Core completes the reconfiguration of data protection, the Data Protected section shows the changed disk-fault-tolerance and node-fault-tolerance levels and, during the next rebalancing phase, the restriper begins to provision additional usable capacity.
Adding Nodes Normally (without Data Protection Reconfiguration)
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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 disk-fault-tolerance and node-fault-tolerance levels as before the node-add operation.