Comprehensive and Detailed Explanation From Exact Extract:
Portworx provides a mechanism to control KVDB pod placement through the kvdb.selector.matchNodeName field in the StorageCluster Custom Resource Definition (CRD). This allows administrators to explicitly specify node names where KVDB pods will be deployed. By setting this selector to include NODE01, NODE03, and NODE05, KVDB pods will run exclusively on these nodes, ensuring better control of quorum, fault tolerance, and performance. Node labeling alone is insufficient unless the labels are properly referenced in the spec, making direct node name matching the most straightforward and reliable method. This configuration must be done prior to cluster installation to ensure proper pod placement. Official Portworx documentation on cluster deployment and KVDB configuration confirms this method as the recommended best practice for managing KVDB nodes, critical for maintaining database availability and consistency within the Portworx cluster【Pure Storage Portworx Install Guide†source】.
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