megasas_register_aen[0]: already registered

If you are working with a RHEL 5.5 or above on a Dell server (PowerEdge R 710) with a SAS Controller integrated RAID, you may have some error messages in the kernel log file. Running dmesg command, here is what you have :

fool@localhost:~$ dmesg

megasas_register_aen[0]: already registered
megasas_register_aen[0]: already registered
megasas_register_aen[0]: already registered

fool@localhost:~$ uname -r

2.6.18-308.11.1.el5

These messages appeared after a recent kernel update. Within this update, the megaraid_sas module has been upgraded and a new function was added to the source code providing complementary information about the module once loaded and interacting with the kernel.

A case issue was filled in RHEL Knowledge Database :

RHEL KB id 43634

These messages are just informational messages. No errors to be expected.

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