|The SWS with ThinWire Ethernet, FDDI, and graphics.|
There are two Ethernet interfaces. The one on the SBus card is 10BASE2, more informally known as ThinWire. This is only used to connect the SWS to the two I/O Processors in the I/O Subsystem. This allows the IOPs to net boot from the SWS and is also used to configure and manage the system.
The second Ethernet connects to our main network as does the Ethernet card in an IOS VME slot which is the main system Ethernet for the J90. We also added a FDDI card for use later.
The disk is a whopping 9 GB. I didn't realize that the first drive I tried was a 10K RPM and the poor workstation almost overheated. The cooling is not very well designed and it can only take disks that don't run too hot.
After installing Solaris 2.5 we then added the J90 Console software. Here's a screenshot of the OpenWindows desktop.
|Screen shot of the SWS desktop show the J90 Installation running.|
Each IOP is a single board computer made by Themis. It has a Sun SPARC processor with Ethernet and resides in a VME backplane. Local SCSI devices can be attached to it, but our IOS only has a single tape drive for installing system software. The IOPs boot from the network.
First we open up a console connection in a terminal window on the SWS. Then we power up the Cray. The IOP first uses bootp to load the firmware. This is similar to OpenBoot on other SPARC systems. From the prompt you can then load the IOS-V kernel which is based on VxWorks.
|J90 Console showing load of the IOS-V kernel.|