IBM Application System/400 Service Information page 141

Exchanging a Disk Unit with
Mirrored Protection
1
Is the status of the disk unit that is mirrored
to the failing disk unit "Active"?
Yes No
~
Exchange the failing disk unit (see
"Disk Unit" on page 4-7).
This ends the procedure.
2
Exchange the failing disk unit (see "Disk
Unit" on page 4-7). Make a note of this
page number because you will be returning
to step 3 of this procedure.
3
Perform an initial program load (IPL) to
dedicated service tools (DST) by doing the
following:
a. Power off the system if it is powered on
(see "Power off" on page 5-2).
b. Select IPL Type A and Mode M (see
"Selecting IPL and Mode" on
page 5-2).
c. Power on the system (see "Power on"
on page 5-2).
4
Go to dedicated service tools (DST) by
doing the following:
a. If the Missing Disk Units display
appears, press the Enter key. If the
IPL or Install the System display does
not appear, press the Enter key again.
b. Select the Use dedicated service tools
option from the IPL or Install the
System display.
c. Enter 22222222 on the Dedicated
Service Tools (DST) Sign On display.
Note: If this password is not valid, ask the
customer for the correct password.
5
Format and initialize the disk unit by doing
the following:
a. Select the Work with disk units option
from the Use Dedicated Service Tools
(DST) display.
b. Select the Work with disk unit recovery
option from the Work with Disk Units
display.
c. Select the Disk unit problem recovery
procedures option from the Work with
Disk Unit Recovery display.
d. Select the disk unit on the display that
is not configured.
e. Select the Initialize and format disk unit
option from the Disk Unit Problem
Recovery Procedures display.
f. Press F10 to initialize and format the
disk unit. When the new disk unit is ini-
tialized and formatted, the display
shows that the status is complete (this
may take 30 minutes or longer).
g. Press the Enter key after verifying that
the status is complete.
6
Perform the following:
a. Press F12 (Cancel) to return to the
Select Disk Unit Recovery Procedures
display.
b. Press F12 (Cancel) to return to the
Work with Disk Unit Recovery display.
c. Select the Replace configured unit
option from the Work with Disk Unit
Recovery display.
d. Select the configured disk unit that is
being exchanged from the Select Con-
figured Unit to Replace display.
e. Select the replacement disk unit from
the Select Replacement Unit display.
7
Perform the following:
a. Return to the Use Dedicated Service
Tools (DST) display.
b. Select the Perform an IPL option to
complete the IPL. Data is copied to the
new disk unit during the IPL.
This ends the procedure.
Resuming Mirrored Protection
Use this procedure to resume mirrored protection
on suspended disk units.
1
Select the Work with disk units option on
the System Service Tools (SST) display or
on the Dedicated Service Tools (DST)
display.
Chapter 5. Service Referenced Procedures
5-5