Storage servers

These are physical servers that run the object server software, and generally also run the account and container server software. Storage servers require disks or solid-state drives (SSDs) to store objects.

Proxy server (or servers)

These are physical servers that run the proxy server software. At least one is required.

Network switch (or switches)

Chapter 3, Installing OpenStack Swift, describes the various networks required. At least one switch is required.

Account servers

For large installations where container listings and updates overwhelm the storage servers, separate account servers may be needed.

Container servers

For large installations where object listings and updates overwhelm the storage servers, separate container servers may be needed.

Auth servers...