snmpwalk on RHEL3 can't read UCD-DISKIO-MIB

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Issue

I can't run snmpwalk and get results from UCD-DISKIO-MIB on Red Hat Enterprise Linux 3:

[root@rhel3 ~]# snmpwalk -v 2c -c public localhost:161 .1.3.6.1.4.1.2021.13.15.1.1.3              
UCD-DISKIO-MIB::diskIONRead = No Such Object available on this agent at this OID

Environment

Red Hat Enterprise Linux (RHEL) 3 - ELS

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