Monitoring Linux disk /process

Hi guys.

I'm new with solarwinds. We have NPM and I need to add some linux servers, runing centos, redhat and debian squeze and maybe later suse.

I know a little about snmp,I've reading about installing and configuring in linux.  But I have some doubts.

I'm using net-snmp in debian. I added a device running debian but cannot get any information about disk usage,memory,number of cpu, I can see /  , swap , listed but there is not any info about.

I'm using the search option in the forum but many info I find is very old.

any steps or what else should I do to monitor the linux boxes?

in the process of adding the device I can test the device and after that it list what I want to monitor, like interfaces, volumes.. but after the device is added I cant see any information.

If  I run:

snmptable -v2c -c xxxxxxx -Cb localhost HOST-RESOURCES-MIB::hrStorageTable

SNMP table: HOST-RESOURCES-MIB::hrStorageTable

Index                                         Type           Descr AllocationUnits      Size   Used AllocationFailures

     1           HOST-RESOURCES-TYPES::hrStorageRam Physical memory      1024 Bytes   3271764 160736                  ?

     3 HOST-RESOURCES-TYPES::hrStorageVirtualMemory  Virtual memory      1024 Bytes  4176200 160736                  ?

     6         HOST-RESOURCES-TYPES::hrStorageOther  Memory buffers      1024 Bytes   5271764  13084                  ?

     7         HOST-RESOURCES-TYPES::hrStorageOther   Cached memory      1024 Bytes     64612  64612                  ?

    10 HOST-RESOURCES-TYPES::hrStorageVirtualMemory      Swap space      1024 Bytes   3904436      0                  ?

    31     HOST-RESOURCES-TYPES::hrStorageFixedDisk               /      4096 Bytes 19192802 232560                  ?

So, I can consult the information.. but why the solarwind cant get it?

thanks