Dell PowerVault 220S (SCSI) - Manual (Page 19)

Basic Troubleshooting : Dell PowerVault 220S and 221S Systems Service Manual
file:///C|/Users/rishi_sood/Desktop/220s/en/sm/basics.htm[3/7/2013 12:09:14 PM]
No. Go to step 3.
Yes. A power supply has failed. Replace the failed power supply (see " Replacing the Power Supply ").
3. Is the amber fault LEDs for blower A and/or blower B illuminated? (See Figure 8 for LED locations.)
No. Go to step 4.
Yes. One of the blowers has failed. Replace the failed cooling module (see " Replacing a Cooling Module ").
CAUTION: A power supply and cooling module can be removed from a powered-on system for a maximum
period of five minutes. Beyond that time, the system begins to overheat, and at a critical temperature, shuts
down to prevent damage.
4. Is the amber fault LED on one or both EMMs illuminated? (See Figure 5 for LED locations.)
No. Go to step 5.
Yes. An EMM has failed. Replace the EMM (see " Removing and Installing EMMs and the SCSI Terminator Card ").
5. Is the split-bus module installed and properly seated? (See Figure 5 for LED locations.)
No. Reseat the split-bus module (see " Removing and Installing the Split-Bus Module ").
Yes. Go to step 6.
6. Replace the SCSI backplane board (see " Replacing the SCSI Backplane ").
Storage System Is Not Seen During Host Boot
1. Is the storage system turned off?
No. Go to step 2.
Yes. Turn on the storage system using the on/off switch on the back of the power supply(s) (see Figure 8 for switch
location).
2. Is the SCSI cable(s) damaged or not attached securely to the SCSI connectors on the EMM(s) and the host controller?
No. Go to step 3.
Yes. Secure the cable(s) or check connector pins for damage.
3. Is the power LED on the split-bus module off? (See Figure 5 for LED locations.)
No. Go to step 4.
Yes. The split-bus module has failed. Replace the split-bus module (see " Removing and Installing the Split-Bus Module ").
4. Is the amber fault LED on one or both EMMs illuminated? (See Figure 5 for LED locations.)
No. Go to step 5.
Yes. An EMM has failed. Replace the EMM (see " Removing and Installing EMMs and the SCSI Terminator Card ").
5. Replace the SCSI backplane board (see " Replacing the SCSI Backplane ").
Operating System Does Not See Hard Drives at Boot
If the storage system is seen during BIOS boot but not by the operating system, make sure that the correct controller device
driver is installed.
Host Locks Up When Attached to Storage System
If your host system locks up after you have connected your storage system, perform the following configuration checks:
Verify that your SCSI cables are approved for use in your storage system. The cables must be rated for either U160 or
U320 SCSI, depending on your configuration.