IBM i 830, Repair Manual

Page: 960 / 1000

The process of performing an IPL from removable media is an alternate or Type D
IPL. The device that contains the IPL media is the alternate IPL device. The system
searches for the alternate IPL device in a specific sequence (see “Search Sequence
for the Alternate IPL Device”).
The alternate IPL device is attached either internally (in the system unit) or
attached externally to the system.
The system configuration list shows the alternate IPL devices. For information on
how to print the system configuration list, see “Hardware Service Manager” in the
iSeries Service Functions information.
Search Sequence for the Alternate IPL Device
The system attempts an IPL from the first alternate IPL device it finds that is ready
and contains IPL media.
The system will search system bus 1 for storage IOAs. The IOA slots are searched
in the order shown below:
1. C02
2. C03
3. C04
. Whenever a storage IOA is detected the system will then search for an alternate
IPL device that is attached to that IOA. The following search sequence is used to
search for an alternate IPL device that is attached to a storage IOA:
1.
Device attached to SCSI bus 0 with a controller address of 7.
2. Device attached to SCSI bus 0 with a controller address of 6.
3.
Device attached to SCSI bus 0 with a controller address of 5.
4. Device attached to SCSI bus 1 with a controller address of 7.
5. Device attached to SCSI bus 1 with a controller address of 6.
6. Device attached to SCSI bus 1 with a controller address of 5.
7. Device attached to SCSI bus 2 with a controller address of 7.
8. Device attached to SCSI bus 2 with a controller address of 6.
9. Device attached to SCSI bus 2 with a controller address of 5.
If the system cannot find a device to use as the alternate IPL device, it displays an
SRC on the control panel.
Note: The SRC that is displayed, is for the most severe error that is found during
the search sequence for the alternate IPL device. There may not be an
association between the error and the alternate IPL device that you are
using. Before using the displayed SRC to analyze the problem, ensure that
the alternate IPL device is ready and contains the correct IPL media.
External Device Addressing
The external alternate IPL device must have a controller address of 7, 6, or 5. For
most devices, the controller comes with the address preset to 7, and you cannot
alter it. For devices that have changeable addresses, use the following information:
v
For 34xx, 35xx, and 7208 model 342 tape devices you must set the SCSI address
to address 0, 1, or 2. For an IBM 9427 8mm Tape Cartridge Library, you must set
the tape library address for the drive that is used as the alternate IPL device to
address 0, 1, or 2.
Determining Load Source, Alternate IPL
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iSeries Model 830, 840, SB2, and SB3 Problem Analysis, Repair and Parts V5R1