PowerScale OneFS 9.2.1.0 CLI Administration Guide

Autoprovisioning

When you add a node to a cluster, OneFS attempts to assign the node to a node pool. This process is known as autoprovisioning, which helps OneFS to provide optimal performance, load balancing, and file system integrity across a cluster.

A node is not autoprovisioned to a node pool and made writable until at least three equivalent nodes are added to the cluster. If you add only two equivalent nodes, no data is stored on these nodes until a third equivalent node is added.

If a node fails or is removed from the cluster so that fewer than three nodes remain, the node pool becomes underprovisioned. In this case, the two remaining nodes are still writable. If only one node remains, the node is not writable, but remains readable.

New nodes added to your cluster are likely to be different from the nodes in existing node pools. Unless you add three new equivalent nodes each time you upgrade your cluster, the new nodes are not autoprovisioned. However, you can add new node types to existing node pools. You can add nodes one at a time to your cluster, and the new nodes can become fully functioning peers within existing node pools. See Compatibilities for more information.