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Boot Modes 187
6-00020-02
SNC 5100
Diagnostic Command Reference
This section specifies the procedures used when diagnostics are required.
Boot Modes
The SNC 5100 has two modes of operation: normal mode and diagmode. Two
commands are available from the service terminal to reboot the SNC 5100 to
the desired mode. The SNC 5100 remains in the existing mode until it has been
directed to reboot in the other mode.
When the SNC 5100 is booted in diagmode, the command prompt displayed
on the service terminal is
diagmode >. While in diagmode, a limited
command set is available for testing the SNC 5100 interfaces. In addition, the
device drivers for the Ethernet, Fibre Channel, and SCSI interfaces are disabled
so loop back tests can be performed on them.
Entering Diagnostic Mode
Use the diagBoot command when the special features of the SNC 5100’s
diagnostic module are required.
Follow this procedure to enter diagnostic mode.
Step 1. Stop all I/O.
Caution
Before entering
diagmode, you must disconnect all SCSI and FC
cables from the SNC 5100. If you do not, the data on the attached
tape devices will become corrupted.
Step 2. Shut down the SNC 5100.
Step 3. Remove the Ethernet cable, if installed.
Step 4. Connect the terminal to the Service Port.
Step 5. Turn on the SNC 5100 and wait for it to finish booting.
Step 6. If the command prompt displayed on the service terminal is
diagmode > , proceed with the appropriate diagnostic tests.