See

ftp://ftp.software.ibm.com/systems/support/system_x_pdf/d3basmst.pdf
ftp://ftp.software.ibm.com/systems/support/system_x_pdf/88p9248.pdf
http://www.redbooks.ibm.com/abstracts/sg246495.html

for documentation about IBM management processors and the
IBMmpcli utility.