This seems like a minor oversight. You can run volume set to set properties, but there is no way to list all of the properties on a given volume.
They show up in volume info. Here is the output from my machine. gluster> volume info Volume Name: pranith Type: Distribute Status: Created Number of Bricks: 1 Transport-type: tcp Bricks: Brick1: pranithk-laptop:/tmp/brick1 Options Reconfigured: <<--------- performance.read-ahead: enable <<-------