HP A3312A - Manual (Page 52)

Troubleshooting & Diagnostics
Troubleshooting Procedures
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Troubleshooting
Table 10. Disk Module/SCSI Bus Troubleshooting
Condition Recommended Action*
Disk module not recognized by host
or fails power-on self-test. Check for SCSI bus termination. Check for correct terminator
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
during operation Check for a green status light on the disk module. If it is a DF
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
immediately after a disk module is
replaced. Ensure that an SE disk module is not installed in a wide
differential slot, or that a WD disk module is not installed in a
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
recognized by the host. I/O
subsystem errors are logged after a
system boot. Ensure that the DF disk module is not installed in a single-ended
slot. A DF disk module on a single-ended bus is usually
transparent to the host. The SE disk modules on the single-ended
bus will operate normally.
*SE = single-ended narrow; DF = fast/wide differential