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Troubleshooting & Diagnostics
Troubleshooting Procedures
49
Troubleshooting
Two Power Modules/Two Faults Troubleshooting Procedure
CAUTION! There should be no bus activity when these steps are performed. The storage
system should be offline.
If the storage system contains two power modules and two fan modules and two power supply faults
occur, follow these steps:
1. Cycle storage system power.
2. After power-on, the power module status lights will be amber.
• If both fan module status lights do not turn green before they turn off, replace both fan modules.
• If at least one fan status light turns green after power-on, either a power module has failed or an
over-current condition exists. Follow the steps under "One Power Module/One Fault”.
DDS Tape Module Troubleshooting Procedure
If a DDS tape module failure occurs, see Table 9.
Disk Module Troubleshooting Procedure
If a disk module failure occurs, check the following:
1. A solid green status light at any time other than during a self-test indicates a drive fault. A flashing or
pulsing green status light indicates read/write activity.
2. Termination problems can prevent successful completion of a drive module self-test. Verify there are
no termination problems on the SCSI bus (see "SCSI Bus Troubleshooting Procedure").
3. Solve the problem using the appropriate procedure. If the disk module needs to be replaced, see
Figure 29. DF Disk Module Replacement Decision Flowchart”.