Check manual page of megaraid_bbu
LSI MegaRAID: State of battery backup unit (BBU)
This check monitors the existance and status of battery backup units on controllers
that are based on the mid- and highend LSI Megaraid chipsets. The entry chipsets do
not support BBUs. The Linux agent will try find any existing BBUs - if MegaCli is
found in your search path.
The BBUs might come in various types (iBBU, BBU) and also some other vendors are
using this RAID chip. It is tested against Intel, Dell, IBM and FSC models.
The check works by matching the agent output against a dictionary of expected values.
If you have MegaCli installed and some values are not detected, it might be neccessary
to update your version of MegaCli.
MegaCli can be downloaded from LSI at the following URL
It would be possible to make the warning / critical levels user specifiable.
See the check source for this if you have a need to influence those parameters.
Most controllers run a "battery learn cycle" periodically or on user request.
The check detects this learn cycle and suppresses all errors while this cycle is active.
This affects all models that do not have a flash / capacitor based BBU system.
A string "RAID Adapter/BBU" followed by the ID of the adapter as reported by MegaCli.
One item is generated per adapter that has an attached BBU module.