Comprehensive and Detailed Explanation From Exact Extract:

Portworx uses node labeling as a mechanism to control on which Kubernetes nodes Portworx is installed and allowed to operate. To restrict Portworx installation on specific nodes, those nodes should be labeled with px/enabled=false. This label tells the Portworx Operator or installation scripts to exclude these nodes from Portworx deployment, preventing Portworx daemons from running there. This feature is useful for reserving nodes for non-storage workloads or avoiding unsupported hardware. Labels like px/service=stop or px/storage-node=false are not recognized by Portworx as controls for installation exclusion. The official Portworx deployment and node labeling documentation specify px/enabled=false as the standard method for controlling node participation in the storage cluster, offering administrators fine-grained control over cluster topology and resource allocation【Pure Storage Portworx Deployment Guide†source】.