IBM Application System/400 Service Information page 140

Disk Service Support
Start Disk Service Here
Before exchanging a disk unit, you must attempt
to save customer data.
This procedure will direct you to the correct
recovery procedure to use when attempting to
save customer data.
1
Do you know whether your system has mir-
rored protection for the failing DASD?
Yes No
~
Go to "Determining if a System Has
Mirrored Protection." Then return
to step 2 of this procedure.
2
Does your system have mirrored protection
for the failing DASD?
No Yes
Go to "Exchanging a Disk Unit with
Mirrored Protection" on page 5-5.
This ends the procedure.
3
You are exchanging the disk unit.
Go to "Disk Unit Data Save and Initialize-
Pump Data to Tape" on page 5-6.
This ends the procedure.
5-4
AS/400 9401 Service Information
Determining if a System Has
Mirrored Protection
Use this procedure to determine if a system is
using mirrored protection.
1
Select the Work with disk units option on
the System Service Tools (SST) or on the
Dedicated Service Tools (DST) display.
2
Select the Display disk configuration option
on the Work with Disk Units display.
3
Select the Display disk configuration status
option on the Display Disk Configuration
display.
Each auxiliary storage pool (ASP) is listed,
showing the disk units that are members of
the ASP. The Status column shows one of
the following protection statuses for the
ASP:
Unprotected
Checksummed
Mirrored
Device Parity
Disk units in an ASP with a protection
status of Mirrored are configured for mir-
rored protection.
4
After looking at the Display Disk Configura-
tion Status display, determine if mirrored
protection is active. Note the address of
the suspended file if any.
Return to the procedure that sent you
here.