IBM DCS9550 1S1 manual Alarm Sounds On Power Up, Green “Signal Good” LED on SCM Not Lit, LEDs

Troubleshooting and Problem Solving

4.2.2Alarm Sounds On Power Up

Please refer to Section 4.4.

4.2.3Green “Signal Good” LED on SCM Not Lit

Check that the cables have not been reversed during installation.

4.2.4Computer Doesn’t Recognize the DCS9550 1S1 Storage Expansion Unit

1Check that the FC-AL interface cables from the DCS9550 1S1 Storage Expansion Unit to the host computer, or RAID controller, are fitted correctly.

2Check the Enclosure ID switch settings on your DCS9550 1S1 Storage Expansion Unit and on your system host.

3Check that the LEDs on all installed drive carrier modules are illuminated Green. Note that the drive LEDs will not be lit during drive spinup.

4Check that all drive carrier modules have been correctly installed.

5Check that there is a valid FC_AL signal present at the I/O connector (see section 2.4.1.) If there is no signal present check that the cable has not been reversed during installation.

6Check the SCM I/O module setup as follows:

–Check that the SCM I/O module has been correctly installed and all external links and cables are securely fitted.

–Check that the maximum cable length has not been exceeded.

4.3LEDs

Green LEDs are always used for good or positive indication, flashing Green/Amber if non- critical conditions exist. Amber LEDs indicate there is a critical fault present within the module.

4.3.1Power Supply/Cooling Module

The Power Supply Cooling LEDs are shown in Table 4–1.

•Under Normal conditions the LEDs should all be illuminated constant GREEN

•If a problem is detected the color of the relevant LED will change to AMBER.

38 IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide