IBM 270, Service Manual

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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:
For 34xx, 35xx, and 7208 models 342, 345 tape devices you must set the SCSI address to 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 0, 1, or 2.
For the location of the address switch on external devices, see the information in the device installation
service manual.
Reclaim IOP cache storage
For use by authorized service providers.
Use this procedure to reclaim IOP cache storage.
1. If you are not already using Dedicated Service Tools, perform an IPL to DST. See Performing an IPL to
DST in the iSeries Service Functions
information. If you cannot perform a type A or B IPL, perform a type D IPL from removable media.
Did you get to DST with a Type D IPL?
v
No : Continue with the next step.
v Yes : Perform the following:
a. Select Work with disk units —> Reclaim IOP cache storage .
b. Follow the on-line instructions to reclaim cache storage. The system will automatically perform
an IPL to a Disk Configuration Attention Report or a Disk Configuration Warning Report display.
Select the option to display the report. Because the Reclaim Cache Storage was selected after a
D-IPL, the system will now require another Reclaim Cache Storage to be performed.
2. Select Work with disk units —> Work with disk unit recovery —> Reclaim IOP Cache Storage .
3. Follow the on-line instructions to reclaim cache storage. Depending on the reason for performing the
Reclaim IOP Cache procedure, there may be a message requiring the ASP be cleared before
performing this option, or a message stating the number of lost sectors.
Note: If there are lost sectors, some objects may be damaged. The customer may have to load the
damaged objects again. (See the Backup and Recovery for more information.) When the IOP performs
a Reset/Reload, if there is a storage IOA attached that is running the local load source, Cxxx xxxx
codes will be displayed in the system control panel. The DST console may then have a blank screen
with 01B displayed on the system control panel for up to 15 minutes before it is restored.
This ends the procedure.
Forms
For use by authorized service providers.
Problem summary form
Preventive maintenance
Work with electrostatic discharge-sensitive parts
Analyze hardware problems
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