There are three separate-but-joined pieces involved in communicating with this machine:

• Lantronix X-Port 4, providing serial<->ethernet bridging. See http://www.lantronix.com/wp-content/uploads/pdf/XPort_UG.pdf

• SGI Roamer-IP, providing power control. See ftp://ftp.sgi.com/public/Technical%20Support/Pdf%20files/Phantom_Roamer/RoamerIP_UsersManual_1.1.pdf

• Rackable Systems SAS JBOD IO Module. Tragically, I have been unable to find a manual despite my best efforts.

Network

Configured by the Lantronix telnet or web interface; admittedly, you have to find it, first.

Baud Rate

Everybody has to agree on baud rate or bad things happen. Moreover, the SAS board is sufficiently opinionated that it will only speak 115200, so that means that everybody else has to fall in line!

• The Lantronix, being the front-facing part, is easiest to change. The web interface or telnet interface (port 9999) will happily do the right thing for you. While here, you might consider setting a management password on the Lantronix itself.

• The Roamer is a little more, ah, fun. It can be reached on port 10001 of the Lantronix’s IP address (by default). Guess among {9600, 19200, 38400, 57600, 115200} as to how it is currently configured and make the Lantronix match. You know you have the correct value when sending 0x1E (i.e. Ctrl-^ or Ctrl-6, as it is often abbreviated) yields the prompt Roamer [? for Help]:. You will probably want to use something like

  socat STDIO,cfmakeraw TCP:...:10001
  

  so that you are not doing line-oriented interaction, as the roamer wants to process input bytewise and extraneous newlines confuse it.

  Once there, use the A option to change the baud rate to 115200. It will prompt for a confirmation password which is likely the default at P4Confirm (case sensitive), though note that the password can be changed by menu option Y.

Power

Ah, my favorite. Telnet in, send Ctrl-^, and P will toggle the power of the SAS board and disks.

Console

The enclosure command will tell you about the box itself, including the internal PSU, fan, and temperature sensors, which might be fun to scrape for logging and alerting.