Troubleshooting & Diagnostics

Troubleshooting Procedures

Table 10. Disk Module/SCSI Bus Troubleshooting

Condition

Recommended Action*

 

 

Disk module not recognized by host

Check for SCSI bus termination. Check for correct terminator

or fails power-on self-test.

type. Check for bent pins on terminators or SCSI cables. Check

 

for SCSI ID conflicts. Ensure that a SCSI cable does not exceed 6

 

meters on a single-ended bus or 25 meters on a wide differential

 

bus. Ensure that a DF disk module has not been connected to an

 

SE host bus adapter, or that an SE disk module has not been

 

connected to a DF host bus adapter.

 

 

Disk module not recognized by host

Check for a green status light on the disk module. If it is a DF

during operation

disk module, perform the hot plug procedure under “DF Disk

 

Module Replacement/Recovery Procedure (HP 3000 Series 900)”

 

prior to replacing it. If it is an SE disk module, shut down the

 

operating system prior to replacing it. Check the power supplies

 

(see “Power Module Troubleshooting Procedures”).

 

 

Wide differential SCSI bus hangs

Ensure that an SE disk module is not installed in a wide

immediately after a disk module is

differential slot, or that a WD disk module is not installed in a

replaced.

single-ended slot. A DF disk module on a single-ended bus is

 

usually transparent to the host.

 

 

A new DF disk module is not

Ensure that the DF disk module is not installed in a single-ended

recognized by the host. I/O

slot. A DF disk module on a single-ended bus is usually

subsystem errors are logged after a

transparent to the host. The SE disk modules on the single-ended

system boot.

bus will operate normally.

 

 

*SE = single-ended narrow; DF = fast/wide differential

Troubleshooting

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