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Table 3-A
Summary of Fault Symptoms and Potential Solutions
SYMPTOMS
SAS PROBLEMS/SYSTEM REBOOT PROBLEMS
System Administrative
Services is unable to start.
Rebooting fails.
WRITE-PROTECTED SYSTEM DISK
Note: The following symptoms indicate that the system disk has been marked as write-protected. If
these symptoms exist, contact NT field support.
First, if you try to create a directory on the :LOCAL disk, the system generates a HELIX 109 error
(access denied) or 115 error (file server is write protected).
Second, you cannot initiate System Administrative Services.
Third, you cannot reboot the system.
POWER FAULTS
Note: Cabinets can be equipped with several types of power supply. If powered from an ac source,
either Power Supply SRUs (installed in the bottom shelves of the cabinets) or Loft Power Supplies
(installed in the air plenum at the top of the cabinet) are used. If powered from a -48 V source, a
-48 V Power Converter SRU is used.
Troubleshooting and Fault Clearing Procedures 17
PROBABLE CAUSES
Another user is using SAS.
Only one user at a time is
allowed.
The terminal is not connected
to the primary processor.
There is a software fault.
There are faults in the cabling
to the disk devices.
There is a primary processor
fault.
The system disk may have
been marked as
write-protected.
CORRECTIVE ACTIONS
Try again when no one else is using
SAS.
Check cabling and system
configuration to ensure that the
terminal can communicate with the
primary processor.
Reboot the system. (For
instructions, see 'Rebooting the
System', earlier in this part.)
Power the system down and check
all disk connections for improperly
seated cables, bent pins, shorts,
and opens.
Power the system down and replace
the primary processor SRU.
Investigate this possibility. (See
WRITE-PROTECTED SYSTEM
DISK in this table.)
Practice 450-1011-501
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