IBM QS21 - BladeCenter - 0792 Service Manual page 101

Table 14. SAS boot errors (continued)
Code Message
E4308 SAS disk device node not
found!
Description
The Open Firmware Device Tree (see
IEEE 1275) become corrupted. It might
indicate a blade firmware problem.
Action
Try following steps in order to fix the
problem:
1. Reboot the blade.
2. Power down then remove and
reinstall the blade server in the
BladeCenter unit.
3. If the error started after a SAS
Expansion Card firmware upgrade
or a blade server firmware
upgrade, consider a rollback to the
previous firmware versions. Check
with the documentation at
http://www.ibm.com/systems/
bladecenter/support/ to verify
whether rollback is possible.
4. If the error has started reporting
after an Open Firmware script
change, for example in a custom
startup script, verify the script.
5. If the error started after activating
an Open Firmware script, for
example by setting the
use-nvramrc? configuration
variable, verify the script.
6. Reproduce the blade server Open
Firmware environment (firmware
version, scripts, configuration
variables, hardware configuration
etc.) with another blade server(s).
7. If the error started after a hardware
component was added or removed,
consider a rollback to the original
hardware configuration.
Chapter 5. Diagnostics and troubleshooting
83