Monday, July 21, 2014

Power Up

The Cray J916 was featured at our monthly open house this past Saturday. We spent most of the day talking to visitors about the system and showing them the rest of our collection. We did make some progress in the morning before we opened. Dave took some photos while I was working.

Working on the Cray J90 backplane
Working on the system clock board on the J90 backplane.
The Central Control Unit is in the foreground.

Everything seems to be functional with one exception - there is a system clock PWR FAULT light showing on the Central Control Unit. We suspected a loose cable or board connector and traced the signal paths. We couldn't find the cause of the fault and will need to dig deeper another time.

Working on the Central Control Unit
Checking the connections inside the CCU.

There have been a number of problems caused by missing entries in the startup files for the IOS which prevented it from loading the mainframe configuration. Without hardware or installation documentation we resorted to tracing error messages in the log files to determine what was missing.

Configuring the IOS from the console
Configuring the I/O Subsystem from the console.

After a few changes the IOS recognizes the board layout including the type and number of modules in the backplane. The eight scaler/vector processors and two memory boards are now properly configured.

Screenshot of the J90 Mainframe setup
J90 Mainframe hardware setup.

The Slave IOS automatically begins loading after the Master has finished. Both IOPs run the powerup and frstload diagnostics after a power reset. These diag tests throw some errors due to the trouble with the clock board. By the end of the day the system was functional enough that we can run the individual Automated Confidence Tests from the command line. Everything internal to the IOS checks out fine.

Screenshot of the J90 Console showing the IOS loading
The I/O Processors network booting from the console.

For our next work session we need to trace down the fault on the system clock and configure the peripherals.

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