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/usr/share/snmp/mibs/UCD-DISKIO-MIB.txt is in libsnmp-base 5.7.3+dfsg-1.8ubuntu3.

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UCD-DISKIO-MIB DEFINITIONS ::= BEGIN

--
-- Derived from the original VEST-INTERNETT-MIB. Open issues:
--
-- (a) where to register this MIB?
-- (b) use not-accessible for diskIOIndex?
--


IMPORTS
    MODULE-IDENTITY, OBJECT-TYPE, Integer32, Counter32, Counter64
        FROM SNMPv2-SMI
    DisplayString
        FROM SNMPv2-TC
    ucdExperimental
        FROM UCD-SNMP-MIB;

ucdDiskIOMIB MODULE-IDENTITY
    LAST-UPDATED "200504200000Z"
    ORGANIZATION "University of California, Davis"
    CONTACT-INFO    
	"This mib is no longer being maintained by the University of
	 California and is now in life-support-mode and being
	 maintained by the net-snmp project.  The best place to write
	 for public questions about the net-snmp-coders mailing list
	 at net-snmp-coders@lists.sourceforge.net.

         postal:   Wes Hardaker
                   P.O. Box 382
                   Davis CA  95617

         email:    net-snmp-coders@lists.sourceforge.net
        "
    DESCRIPTION
        "This MIB module defines objects for disk IO statistics."

    REVISION     "200504200000Z"
    DESCRIPTION
        "Add 64 bit counters. Patch from Dan Nelson."

    REVISION     "200202130000Z"
    DESCRIPTION
        "Add 1, 5 and 15-minute load average objects"

    REVISION     "200001260000Z"
    DESCRIPTION
        "SMIv2 version derived from older definitions contained
         in the VEST-INTERNETT-MIB module."
    ::= { ucdExperimental 15 }

diskIOTable OBJECT-TYPE
    SYNTAX      SEQUENCE OF DiskIOEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "Table of IO devices and how much data they have read/written."
    ::= { ucdDiskIOMIB 1 }

diskIOEntry OBJECT-TYPE
    SYNTAX      DiskIOEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "An entry containing a device and its statistics."
    INDEX       { diskIOIndex }
    ::= { diskIOTable 1 }

DiskIOEntry ::= SEQUENCE {
    diskIOIndex         Integer32,
    diskIODevice        DisplayString,
    diskIONRead         Counter32,
    diskIONWritten      Counter32,
    diskIOReads         Counter32,
    diskIOWrites        Counter32,
    diskIOLA1           Integer32,
    diskIOLA5           Integer32,
    diskIOLA15          Integer32,
    diskIONReadX        Counter64,
    diskIONWrittenX     Counter64
}

diskIOIndex OBJECT-TYPE
    SYNTAX      Integer32 (0..65535)
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "Reference index for each observed device."
    ::= { diskIOEntry 1 }

diskIODevice OBJECT-TYPE
    SYNTAX      DisplayString
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The name of the device we are counting/checking."
    ::= { diskIOEntry 2 }

diskIONRead OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of bytes read from this device since boot."
    ::= { diskIOEntry 3 }

diskIONWritten OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of bytes written to this device since boot."
    ::= { diskIOEntry 4 }

diskIOReads OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of read accesses from this device since boot."
    ::= { diskIOEntry 5 }

diskIOWrites OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of write accesses to this device since boot."
    ::= { diskIOEntry 6 }

diskIOLA1 OBJECT-TYPE
    SYNTAX      Integer32 (0..100)
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The 1 minute average load of disk (%)"
    ::= { diskIOEntry 9 }

diskIOLA5 OBJECT-TYPE
    SYNTAX      Integer32 (0..100)
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The 5 minute average load of disk (%)"
    ::= { diskIOEntry 10 }

diskIOLA15 OBJECT-TYPE
    SYNTAX      Integer32 (0..100)
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The 15 minute average load of disk (%)"
    ::= { diskIOEntry 11 }

diskIONReadX OBJECT-TYPE
    SYNTAX      Counter64
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of bytes read from this device since boot."
    ::= { diskIOEntry 12 }

diskIONWrittenX OBJECT-TYPE
    SYNTAX      Counter64
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of bytes written to this device since boot."
    ::= { diskIOEntry 13 }

END