Error Message; Probable Cause; System Crashessystem Crashes Or Panics; Diagnosticsdiagnostics - HP EISA/PCI Multiplexer Manual

Error Message:

CAN'T ACCESS DEVICE

Probable Cause:

The dial-out port cannot be opened. Check the /dev directory for the port's existence, ownership
and permissions.
System Crashes or Panics
When Mux Cards are added to a computer system, the number of ports and processes increase.
Because of the increase in work load, system kernel parameters may need to be changed.
Fine tuning your kernel is site-dependent. It depends on the number of users on your system, what
applications they are running and your computer's hardware configuration. Again, consult your
system administration manuals.
This is a complex subject and the answer is going to be different for different sites. Rules of thumb,
like doubling or tripling all relevant kernel parameters, while they may get your system up and
running, are not the best solution.
Refer to your system administration manuals for information on how to change the HP-UX kernel
parameters.
Diagnostics
The HP emux_diag utility is a stand-alone program providing the user with the ability to check
status and verify port configuration. It also provides several diagnostic operations.
Running emux_diag Utility
The following conventions are used when running the emux_diag utility:
1. Arrow keys are used to move between menus and menu selections.
2. Use the Esc (escape) key to move out of sub-menus.
3. Pressing the Return key selects the highlighted menu item.
4. Pressing the F1 function key displays a context sensitive help.
5. To exit from emux_diag, highlight Quit on the main menu and press Return.
To start the diagnostic utility, type /usr/bin/emux_diag on the UNIX prompt line and press the
Return key. The Main Menu is displayed showing the driver status drop down menu selections.
The Main Menu selections are:
Driver Status
Port Status
Diagnostics
Quit
Driver Status Menu Selections
As shown in Figure 6- 1 , the Driver Status pull down menu is displayed with the following selections:
Driver Status
Board Status
Counters
Topology
and the cursor is highlighting the Driver Status selection.
32 Troubleshooting and Diagnostics