IBM QS21 Service Guide - Page 100
replacement.
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Table 14. SAS boot errors (continued) Code Message Description Action E4307 LSISAS1064 network topology read failed. The blade server firmware was not Try following steps in order to fix the able to discover the SAS topology. This problem: could indicate a hardware, blade server 1. Reboot the blade. firmware, or SAS expansion card firmware problem. 2. Power down then remove and reinstall the blade server in the BladeCenter unit. 3. Remove and reinstall the SAS Expansion Card. 4. Ensure the SAS Expansion Card firmware and blade firmware version are at the correct level. 5. 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. 6. Plug the SAS expansion card into another blade server. If the problem persists, the SAS Expansion Card may need replacement. 7. Plug a different SAS expansion card into the blade server. If the problem persists, the blade server may need replacement. 82 BladeCenter QS21 Type 0792: Problem Determination and Service Guide