IBM QS21 - BladeCenter - 0792 Service Manual page 102

Table 14. SAS boot errors (continued)
Code Message
E4309 SAS disk
(@<Bus>,<ID>,<LUN>):
SAS address not found!
84
BladeCenter QS21 Type 0792: Problem Determination and Service Guide
Description
The Open Firmware Device Tree (see
IEEE 1275) is corrupted. This might
indicate a blade server firmware
problem. Note that it is likely that blade
firmware was not able to read a remote
disk as well (see error #E430B).
The <Bus>, <ID>, and <LUN> values
determine the disk's Open Firmware
Device Tree unit address (see IEEE
1275). Sample error message:
E4309 SAS disk (@0,3,0): SAS
address not found! The Open Firmware
Device Tree node name is
/axon@10000000000/plb5/plb4/
pcix@4000004600000000/scsi@2/
disk@0,3,0. The disk is located at
Bus#0, ID#3, and LUN#0.
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 blade
server firmware update, consider a
rolling back to the previous
firmware version. Check with the
documentation at
http://www.ibm.com/systems/
bladecenter/support/ to verify
whether rollback is possible.
4. Update the blade firmware.
5. If the error started after an Open
Firmware script change (for
example, a custom startup script),
verify the script.
6. If the error started after activating
an Open Firmware script, (for
example by setting
use-nvramrc?configuration
variable), verify the script.
7. Reproduce the blade Open
Firmware environment (firmware
version, scripts, configuration
variables, hardware configuration
etc.) with another blade server.
8. If the error started after a
hardware was added or removed,
consider rolling back to the original
hardware configuration.