Hi Jason,
i don't think you can disable the sound from the CIMC, but you can disable the alarm by loading the MegaCLI to run the command to disable the alarm. The MegaCLI is an application the runs on top of the OS, it is a utility.
In the link below you can download the tool if you go to software downloads and expand the management software tools
http://www.lsi.com/products/raid-controllers/pages/megaraid-sas-9271-8i.aspx#tab/tab4
The link below has some commands including the silence alarm command that will silence the alarm
http://erikimh.com/megacli-cheatsheet/
Depends on the version of the OS you might need to use the storCLI, if this is the case see the list of commands below
http://mycusthelp.info/LSI/_cs/AnswerPreview.aspx?sSessionID=&inc=8275
please let me know if this is what you are looking for and don't forget to rate any useful answers.