Appendix. Troubleshooting And Additional Resources; Troubleshooting Tips - IBM N3400 Installation And Setup Instructions

Appendix. Troubleshooting and additional resources

The following sections provide troubleshooting tips and a list of additional resources for the N3400.

Troubleshooting tips

Use these instructions if your storage system does not boot when you power it on.
Follow these troubleshooting tips in the order shown here.
1. Look for a description on the console. Follow the instructions, if provided, on the console.
2. Check all cables and connections, making sure that they are secure.
3. Ensure that power is supplied and is reaching your system from the power source.
4. Check the power supplies on your system and attached storage expansion units. If the LEDs on a
power supply are not illuminated, remove the power supply and reinstall it, making sure that it
connects with the backplane.
5. Verify expansion unit compatibility and check the disk shelf IDs, as described in "Setting storage
expansion unit shelf IDs" on page 6.
6. Ensure that the storage expansion unit speeds are set correctly:
Expansion unit type
EXN1000
EXN2000
EXN4000
EXN2000s and EXN4000s mixed
in the same loop
Note: SAS storage expansion units do not have speed switches.
7. Check disk ownership:
a. Make sure there are disks assigned to the system. Enter disk show.
b. Verify that there is storage attached to the system. Enter disk show -v.
c. Verify that changes were made. Enter disk show - v.
8. Turn off your system and storage expansion units, and then turn on the storage expansion units.
Check the quick reference card that came with the expansion units for information about LED
responses.
9. Use onboard diagnostics to check the disks.
v To check SAS disks:
a. Turn on your system and press Ctrl+C. Enter boot_diags at the firmware (LOADER) prompt.
b. Enter mb in the Diagnostic Monitor program.
c. Enter 6 to select the SAS test menu.
d. Enter 42 to scan and show disks on the selected SAS. This displays the number of SAS disks.
e. Enter 72 to show the attached SAS devices.
f. Exit the Diagnostic Monitor by entering 99 at the prompt. Enter the exit command to return to
LOADER. Start Data ONTAP by entering autoboot at the prompt.
v To check Fibre Channel disks:
a. Enter mb in the Diagnostic Monitor program
© Copyright IBM Corp. 2010, 2011
Set speed to
2 Gb
2 Gb
4 Gb or 2 Gb, as necessary
2 Gb
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