Read and write requests can fail with an error response.

Once a connection has been established, the client can submit commands.

Every disk (or 'export') has a number of associated flags. This will be returned from the server when the negotiation is complete.

During the protocol negotiation there are some defined flags used to choose protocol variants. These flags are sent by the server.

During the protocol negotiation there are some defined flags used to choose protocol variants. These flags are sent by the client.

In the 'newstyle' negotiation there is an opportunity for the client to negotiate options with the server. These are the known options.

When the client sends an option request, the server must reply.

The server sends an initial greeting when the connectino is opened. It can be of two main types: the original V1 and a 'newstyle' V2.

The initial greeting sent by the server

The client's initial response to the server's greeting

Every option the client requests has the same header.

An ExportName option payload

Details about the export chosen by the client, sent in response to an ExportName option.

The server sends a response to every option request sent by the client (except ExportName which is followed by a DiskInfo. This is the header of the response.

In response to a List option, the server sends a number of Server responses and then finally an Ack

After the negotation phase, clients send I/O requests to the server.

A reply sent from the server in response to a Request. Note these arrive out-of-order.