The key tool in the toolbox for exploring MIBs and finding things in SNMP is either "snmpwalk" or looking at the actual MIB text definitions. On CentOS 5 (and RHEL 5), the net-snmp package installs a default set of MIBs to "/usr/share/snmp/mibs/".

# snmpwalk -v 2c -c public localhost diskIONReadX

That particular command uses version "2c" of the SNMP protocol to talk to the "public" community on the localhost and looks for "diskIONReadX" (which is a 64bit counter value column from the diskIOTable).

# snmptranslate -m +ALL -IR -Td diskIONReadX

Here, we use "snmptranslate" to report on full details (-Td) of the diskIONReadX property. When looking up SNMP attributes by labels, you'll want to use the above format, but you can change "-Td" to other "-T" options or a "-O" option. Some common choices are:

# snmptranslate -m +ALL -IR -Td diskIONReadX
UCD-DISKIO-MIB::diskIONReadX
diskIONReadX OBJECT-TYPE
-- FROM UCD-DISKIO-MIB
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION "The number of bytes read from this device since boot."
::= { iso(1) org(3) dod(6) internet(1) private(4) enterprises(1) ucdavis(2021) ucdExperimental(13) ucdDiskIOMIB(15) diskIOTable(1) diskIOEntry(1) 12 }

# snmptranslate -m +ALL -IR -On diskIONReadX
.1.3.6.1.4.1.2021.13.15.1.1.12

# snmptranslate -m +ALL -IR -Of diskIONReadX
.iso.org.dod.internet.private.enterprises.ucdavis.ucdExperimental.
ucdDiskIOMIB.diskIOTable.diskIOEntry.diskIONReadX

# snmptranslate -m +ALL -IR -Ou diskIONReadX
enterprises.ucdavis.ucdExperimental.ucdDiskIOMIB.diskIOTable.
diskIOEntry.diskIONReadX

Labels: 2009, SNMP