RAID health with Nagios

I have just arrived in a computer park where there are 2 systems Open-e model Data Storage Software V7.
I would like to monitor the RAID and the health of the disks with Nagios but I cannot find the corresponding OID (i don't find them in the web interface too).
I looked at some documentation (forum and this website) but I don't see anything except for check the status of other components like CPU or fans).

I also saw OMD but I don't want to touch anything on the configuration for the moment.

Could you tell me how to know the state of the disks by SNMP?