Software and Microcode Errors
Some SRNs indicate that a problem might have been caused by a software error or by
a microcode error. If you have one of these SRNs, do the following actions:
1. Make a note of the contents of the error log for the device that has the problem.
2. Go to the system service aids and select Display Vital Product Data to display
the VPD of the failing system. Make a note of the VPD for all the SSA adapters
and disk drives.
3. Report the problem to your support center. The center can tell you whether you
have a known problem, and can, if necessary, provide you with a correction for the
software or microcode.
SSA Loop Configurations that Are Not Valid
Note: This section is related to SRN 48000.
SRN 48000 shows that the SSA loop contains more devices or adapters than are
allowed. The maximum numbers allowed depend on the adapter. Refer to the

IBM

SerialRAID Adapter: Installation and User's Guide

for details.
If the SRN occurred when you or the customer turned on the system:
1. Turn off the system.
2. Review the configuration that you are trying to make, and determine why that
configuration is not valid.
3. Correct your configuration by reconfiguring the SSA cables or by removing the
excess devices or adapters from the loop.
4. Turn on the system.
If the SRN occurred because additional devices or adapters were added to a working
SSA loop:
1. Remove the additional devices or adapters that are causing the problem, and put
the loop back into its original, working configuration.
Note:

It is important that you do these actions

, because they enable the
configuration code to reset itself from the effects of the error.
2. Review the configuration that you are trying to make, and determine why that
configuration is not valid.
3. Correct your configuration by reconfiguring the SSA cables or by removing the
excess devices or adapters from the loop.
Dealing with Fast-Write Problems
Fast-Write problems are indicated by Service Request Numbers (SRNs): in the series
425xx.
12 IBM SerialRAID Adapter Maintenance Information