IBM 3745 Service Functions page 252

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Hard Disk Trouble Analysis and Replacement
This section describes the procedures that should be used when the MOSS signals an I/O error on the
disk.
Two different procedures may be followed:
1. The backup copies of the primary, secondary, third, fourth, and fifth diskettes are valid and up-to-
date.
• You have saved the MOSS disk recently,
• You have a valid backup copy of the last EC installed, or
• You have a valid backup copy of the initial installation,
and the CDF has not been modified since.
Use the 'backup' diskettes and follow procedure 1.
2. The backup copies of the primary, secondary, third, fourth, and fifth diskettes are not valid or not
up-to-date, or the installation is not successfully completed.
• You have not saved the MOSS disk recently,
• You have an invalid backup copy of the last EC installed,
• You have an invalid backup copy of the initial installation, or
• The installation is not successfully completed,
• The CDF has been modified since the last copy has been made.
Use the 'normal' diskettes and follow procedure 2.
Procedure 1
You have a valid and up-to-date set of backup diskettes.
STEP 1
STEP 2
STEP 3
1. Set the 3745 in service mode 1 or 2 at the control panel.
2. Mount the primary 'backup' diskette.
3. IML in diskette mode (function 9 at the control panel).
4. Re-initialize the current disk. Refer to "Initialize the Disk" on page 11-11.
Note: You must enter the serial number of the 3745.
Restore the disk from the backup diskettes, that is, the primary, secondary, third, fourth, and
fifth diskettes that contain the latest version of the microcode and the current CDF.
Use the RESTORE DISK option (3) of the 'DIF' function that is on the 3745 function menu 1
screen. See "Restore the Disk from Diskettes" on page 11-8.
If the restore is successful, you have completed the procedure. Restart the job that previ-
ously failed.
If the restore fails because of an I/O error, go to STEP 3.
Replace the disk file adapter card (DFA). Refer to the Maintenance Information Procedures
manual that explains the DFA replacement procedure.
After DFA replacement, try to restore the disk from the diskettes again (see STEP 2).
• If the restore is successful, you have completed the procedure. Restart the job that pre-
viously failed.
Chapter 11. Disk-Diskette Management Functions
11-19