Troubleshooting If The System Does Not Boot - IBM N series Hardware Manual

15.4 Troubleshooting if the system does not boot

This section is an excerpt from the Data ONTAP 8.1 7-mode software setup guide.
If your system does not boot when you power it on, you can troubleshoot the problem by
completing the following steps:
1. Look for a description of the problem on the console and follow any instructions that are
provided.
2. Make sure that all cables and connections are secure.
3. Ensure that power is supplied and is reaching your system from the power source.
4. Make sure that the power supplies on your controller and disk shelves are working, as
shown in Table 15-2.
Table 15-2 Power supply LED status
If the LEDs on a power supply are...
Illuminated
Not illuminated
5. Verify disk shelf compatibility and check the disk shelf IDs.
6. Ensure that the Fibre Channel disk shelf speed is correct. If you have DS14mk2 Fibre
Channel and DS14mk4 Fibre Channel shelves that are mixed in the same loop, set the
shelf speed to 2 Gb, regardless of module type.
7. Check disk ownership to ensure that the disks are assigned to the system:
a. Verify that disks are assigned to the system by running the disk show command.
a. Validate that storage is attached to the system and verify any changes that you made
by running the disk show -v command.
8. Turn off your controller and disk shelves, then turn on the disk shelves. For more
information about LED responses, check the quick reference card that came with the disk
shelf or the hardware guide for your disk shelf.
9. Complete the following steps to use the onboard diagnostic tests to check that Fibre
Channel disks in the storage system are operating properly:
a. Turn on your system and press Ctrl+C.
b. Enter boot_diags at the LOADER> prompt.
c. Enter fcal in the Diagnostic Monitor program that starts at boot.
d. Enter 73 at the prompt to show all disk drives.
e. Exit the Diagnostic Monitor by entering 99 at the prompt.
f. Run the exit command to return to LOADER.
g. Start Data ONTAP by entering autoboot at the prompt.
10.Complete the following steps to use the onboard diagnostic tests to check that SAS disks
in the storage system are operating properly:
a. Enter mb in the Diagnostic Monitor program.
b. Enter 6 to select the SAS test menu.
c. Enter 42 to scan and show disks on the selected SAS. Doing so displays the number of
SAS disks.
d. Enter 72 to show the attached SAS devices.
Then...
Proceed to the next step.
Remove the power supply and reinstall it. Ensure
that it connects with the backplane.
Chapter 15. Preparation and installation
211