· Charlie Holland · Architecture
Fifteen Hyperdisks a Node, and the Arithmetic Nobody Will Explain
You size a GKE cluster for thirty small stateful workloads, each with a modest PVC. You expect them to pack onto the nodes neatly. Instead half the nodes are idling, a quarter of your pods are Pending, and the error is about 'volume attach limits.' The number, when you dig into it, is fifteen. Why fifteen? Good question.