Why SNMP monitoring is not working with SCSI Storage OIDs ?

[nasir.k]

I want to do SNMP based monitoring of some DL-385 machines and a MSA500 box attached with that. I already have a linux machine acting as an SNMP server( or NMS) which can poll SNMP agents (these DL-385 machines) and show the result. Parameters like memory status ,CPU values etc. are working fine, But we need to monitor some more parameters like the following,

1. Status of the drive(physical and logical)
2. Status of RAID

But when I try to query the SNMP agent from the NMS(or even from the agent itself) its NOT returning any value for the OID of 1.3.6.1.4.1.232.5 as shown below

[root@onmdb1 mibs]# snmpwalk -v 1 -c xxxxx localhost 1.3.6.1.4.1.232.5
[root@onmdb1 mibs]#

But when I give other OIDs its working fine and even 1.3.6.1.4.1.232 list a hell lot of them.
Please note that I am using net-snmp package for my SNMP server and snmpwalk is suppose to return all values under the given OID. In this case, its not returning anything . But when I give OID 1.3.6.1.4.1.232, (i.e compaq MIB) its returning a lot of values successfully. Also, please not that in the main snmp configuration file in the DL-385 server(in that machine also, I had installed net-snmp package) following lines were added automatically by HP
Insight management agent.

# Following entries were added by HP Insight Management Agents at
# Mon Jan 9 14:22:48 IST 2006
dlmod cmaX /usr/lib/libcmaX.so
rwcommunity xxxxxxxxxx 127.0.0.1
syscontact Root (configure /etc/snmp/snmp.local.conf)
syslocation Unknown (edit /etc/snmp/snmpd.conf)

Now my question is following,

1. Why is it not returning any value corresponding to SCSI values while returning OIDs corresponding to memory and all successfully?
2. What is needed from my side to let the agent return these values ?
3. Do I need to install / configure anything in the agents to get this done

I am using CentOS 4.3 as the OS and net-snmp version 5.1.2-11 for SNMP

Please tell me what to do

Thanx in advance
Nasir