snmpによるトラフィック監視

はじめに †

このページではsnmpを使った総送受信データの取得方法について説明する。

net-snmp-utilsをインストール †

yum install net-snmp-utils

snmpでの監視結果を表示するコマンド †

$ snmpwalk -v 2c -c public [IPaddr] [OID]

各インターフェースが何番のOIDかを調べるコマンド †

• ifDescr

  $ snmpwalk -v 2c -c public [IPaddr] ifTable
  IF-MIB::ifDescr.1 = STRING: lo
  IF-MIB::ifDescr.2 = STRING: eth0
  IF-MIB::ifDescr.3 = STRING: sit0

  eth0の値を取得したい場合、"2"となる。

eth0が送受信した総バイト数 †

eth0が"2"という事がわかったので、ifHC[OUT|IN]Octetsの後ろに".2"を追加する。

• 送信

  $ snmpwalk -v 2c -c public [IPaddr] ifHCOutOctets.2

• 受信

  $ snmpwalk -v 2c -c public [IPaddr] ifHCInOctets.2

その他、OIDが不明な項目を監視する場合 †

まずは、システムがどのような値を出力するかを下記のコマンドで調べる。

$ snmpwalk -v 2c -c public 192.168.1.10 -On .1.3.6.1.4.1.2021

以下のようなリストが出力される。

.1.3.6.1.4.1.2021.4.1.0 = INTEGER: 0
.1.3.6.1.4.1.2021.4.2.0 = STRING: swap
.1.3.6.1.4.1.2021.4.3.0 = INTEGER: 6096656
.1.3.6.1.4.1.2021.4.4.0 = INTEGER: 6093800
.1.3.6.1.4.1.2021.4.5.0 = INTEGER: 4040968
.1.3.6.1.4.1.2021.4.6.0 = INTEGER: 435872
.1.3.6.1.4.1.2021.4.11.0 = INTEGER: 6529672
.1.3.6.1.4.1.2021.4.12.0 = INTEGER: 16000
.1.3.6.1.4.1.2021.4.13.0 = INTEGER: 0
.1.3.6.1.4.1.2021.4.14.0 = INTEGER: 23716
.1.3.6.1.4.1.2021.4.15.0 = INTEGER: 1818336
.1.3.6.1.4.1.2021.4.100.0 = INTEGER: 0
.1.3.6.1.4.1.2021.4.101.0 = STRING: 
.1.3.6.1.4.1.2021.10.1.1.1 = INTEGER: 1
.1.3.6.1.4.1.2021.10.1.1.2 = INTEGER: 2
.1.3.6.1.4.1.2021.10.1.1.3 = INTEGER: 3
.1.3.6.1.4.1.2021.10.1.2.1 = STRING: Load-1
.1.3.6.1.4.1.2021.10.1.2.2 = STRING: Load-5
.1.3.6.1.4.1.2021.10.1.2.3 = STRING: Load-15
.1.3.6.1.4.1.2021.10.1.3.1 = STRING: 0.08
.1.3.6.1.4.1.2021.10.1.3.2 = STRING: 0.16
.1.3.6.1.4.1.2021.10.1.3.3 = STRING: 0.12
.1.3.6.1.4.1.2021.10.1.4.1 = STRING: 12.00
.1.3.6.1.4.1.2021.10.1.4.2 = STRING: 12.00
.1.3.6.1.4.1.2021.10.1.4.3 = STRING: 12.00
.1.3.6.1.4.1.2021.10.1.5.1 = INTEGER: 8
.1.3.6.1.4.1.2021.10.1.5.2 = INTEGER: 16
.1.3.6.1.4.1.2021.10.1.5.3 = INTEGER: 12
.1.3.6.1.4.1.2021.10.1.6.1 = Opaque: Float: 0.080000
.1.3.6.1.4.1.2021.10.1.6.2 = Opaque: Float: 0.160000
.1.3.6.1.4.1.2021.10.1.6.3 = Opaque: Float: 0.120000
.1.3.6.1.4.1.2021.10.1.100.1 = INTEGER: 0
.1.3.6.1.4.1.2021.10.1.100.2 = INTEGER: 0
.1.3.6.1.4.1.2021.10.1.100.3 = INTEGER: 0
.1.3.6.1.4.1.2021.10.1.101.1 = STRING: 
.1.3.6.1.4.1.2021.10.1.101.2 = STRING: 
.1.3.6.1.4.1.2021.10.1.101.3 = STRING: 
.1.3.6.1.4.1.2021.11.1.0 = INTEGER: 1
.1.3.6.1.4.1.2021.11.2.0 = STRING: systemStats
.1.3.6.1.4.1.2021.11.3.0 = INTEGER: 0
.1.3.6.1.4.1.2021.11.4.0 = INTEGER: 0
.1.3.6.1.4.1.2021.11.5.0 = INTEGER: 587
.1.3.6.1.4.1.2021.11.6.0 = INTEGER: 149
.1.3.6.1.4.1.2021.11.7.0 = INTEGER: 983
.1.3.6.1.4.1.2021.11.8.0 = INTEGER: 2064
.1.3.6.1.4.1.2021.11.9.0 = INTEGER: 2
.1.3.6.1.4.1.2021.11.10.0 = INTEGER: 0
.1.3.6.1.4.1.2021.11.11.0 = INTEGER: 95
.1.3.6.1.4.1.2021.11.50.0 = Counter32: 7680014
.1.3.6.1.4.1.2021.11.51.0 = Counter32: 119141
.1.3.6.1.4.1.2021.11.52.0 = Counter32: 5632577
.1.3.6.1.4.1.2021.11.53.0 = Counter32: 207044221
.1.3.6.1.4.1.2021.11.54.0 = Counter32: 4275592
.1.3.6.1.4.1.2021.11.55.0 = Counter32: 3946511
.1.3.6.1.4.1.2021.11.56.0 = Counter32: 93432
.1.3.6.1.4.1.2021.11.57.0 = Counter32: 650277544
.1.3.6.1.4.1.2021.11.58.0 = Counter32: 2568909688
.1.3.6.1.4.1.2021.11.59.0 = Counter32: 2151222727
.1.3.6.1.4.1.2021.11.60.0 = Counter32: 220741212
.1.3.6.1.4.1.2021.11.61.0 = Counter32: 1592634
.1.3.6.1.4.1.2021.11.62.0 = Counter32: 6073
.1.3.6.1.4.1.2021.11.63.0 = Counter32: 6537
.1.3.6.1.4.1.2021.13.14.1.0 = INTEGER: 1
.1.3.6.1.4.1.2021.13.15.1.1.1.1 = INTEGER: 1
.1.3.6.1.4.1.2021.13.15.1.1.1.2 = INTEGER: 2
.1.3.6.1.4.1.2021.13.15.1.1.1.3 = INTEGER: 3
.1.3.6.1.4.1.2021.13.15.1.1.1.4 = INTEGER: 4
.1.3.6.1.4.1.2021.13.15.1.1.1.5 = INTEGER: 5
.1.3.6.1.4.1.2021.13.15.1.1.1.6 = INTEGER: 6
.1.3.6.1.4.1.2021.13.15.1.1.1.7 = INTEGER: 7
.1.3.6.1.4.1.2021.13.15.1.1.1.8 = INTEGER: 8
.1.3.6.1.4.1.2021.13.15.1.1.1.9 = INTEGER: 9
.1.3.6.1.4.1.2021.13.15.1.1.1.10 = INTEGER: 10
.1.3.6.1.4.1.2021.13.15.1.1.1.11 = INTEGER: 11
.1.3.6.1.4.1.2021.13.15.1.1.1.12 = INTEGER: 12
.1.3.6.1.4.1.2021.13.15.1.1.1.13 = INTEGER: 13
.1.3.6.1.4.1.2021.13.15.1.1.1.14 = INTEGER: 14
.1.3.6.1.4.1.2021.13.15.1.1.1.15 = INTEGER: 15
.1.3.6.1.4.1.2021.13.15.1.1.1.16 = INTEGER: 16
.1.3.6.1.4.1.2021.13.15.1.1.1.17 = INTEGER: 17
.1.3.6.1.4.1.2021.13.15.1.1.1.18 = INTEGER: 18
.1.3.6.1.4.1.2021.13.15.1.1.1.19 = INTEGER: 19
.1.3.6.1.4.1.2021.13.15.1.1.1.20 = INTEGER: 20
.1.3.6.1.4.1.2021.13.15.1.1.1.21 = INTEGER: 21
.1.3.6.1.4.1.2021.13.15.1.1.1.22 = INTEGER: 22
.1.3.6.1.4.1.2021.13.15.1.1.1.23 = INTEGER: 23
.1.3.6.1.4.1.2021.13.15.1.1.1.24 = INTEGER: 24
.1.3.6.1.4.1.2021.13.15.1.1.1.25 = INTEGER: 25
.1.3.6.1.4.1.2021.13.15.1.1.1.26 = INTEGER: 26
.1.3.6.1.4.1.2021.13.15.1.1.1.27 = INTEGER: 27
.1.3.6.1.4.1.2021.13.15.1.1.1.28 = INTEGER: 28
.1.3.6.1.4.1.2021.13.15.1.1.1.29 = INTEGER: 29
.1.3.6.1.4.1.2021.13.15.1.1.1.30 = INTEGER: 30
.1.3.6.1.4.1.2021.13.15.1.1.1.31 = INTEGER: 31
.1.3.6.1.4.1.2021.13.15.1.1.1.32 = INTEGER: 32
.1.3.6.1.4.1.2021.13.15.1.1.1.33 = INTEGER: 33
.1.3.6.1.4.1.2021.13.15.1.1.1.34 = INTEGER: 34
.1.3.6.1.4.1.2021.13.15.1.1.2.1 = STRING: ram0
.1.3.6.1.4.1.2021.13.15.1.1.2.2 = STRING: ram1
.1.3.6.1.4.1.2021.13.15.1.1.2.3 = STRING: ram2
.1.3.6.1.4.1.2021.13.15.1.1.2.4 = STRING: ram3
.1.3.6.1.4.1.2021.13.15.1.1.2.5 = STRING: ram4
.1.3.6.1.4.1.2021.13.15.1.1.2.6 = STRING: ram5
.1.3.6.1.4.1.2021.13.15.1.1.2.7 = STRING: ram6
.1.3.6.1.4.1.2021.13.15.1.1.2.8 = STRING: ram7
.1.3.6.1.4.1.2021.13.15.1.1.2.9 = STRING: ram8
.1.3.6.1.4.1.2021.13.15.1.1.2.10 = STRING: ram9
.1.3.6.1.4.1.2021.13.15.1.1.2.11 = STRING: ram10
.1.3.6.1.4.1.2021.13.15.1.1.2.12 = STRING: ram11
.1.3.6.1.4.1.2021.13.15.1.1.2.13 = STRING: ram12
.1.3.6.1.4.1.2021.13.15.1.1.2.14 = STRING: ram13
.1.3.6.1.4.1.2021.13.15.1.1.2.15 = STRING: ram14
.1.3.6.1.4.1.2021.13.15.1.1.2.16 = STRING: ram15
.1.3.6.1.4.1.2021.13.15.1.1.2.17 = STRING: sda
.1.3.6.1.4.1.2021.13.15.1.1.2.18 = STRING: sda1
.1.3.6.1.4.1.2021.13.15.1.1.2.19 = STRING: sda2
.1.3.6.1.4.1.2021.13.15.1.1.2.20 = STRING: sda3
.1.3.6.1.4.1.2021.13.15.1.1.2.21 = STRING: sdb
.1.3.6.1.4.1.2021.13.15.1.1.2.22 = STRING: sdb1
.1.3.6.1.4.1.2021.13.15.1.1.2.23 = STRING: sdc
.1.3.6.1.4.1.2021.13.15.1.1.2.24 = STRING: sdc1
.1.3.6.1.4.1.2021.13.15.1.1.2.25 = STRING: sr0
.1.3.6.1.4.1.2021.13.15.1.1.2.26 = STRING: md0
.1.3.6.1.4.1.2021.13.15.1.1.2.27 = STRING: loop0
.1.3.6.1.4.1.2021.13.15.1.1.2.28 = STRING: loop1
.1.3.6.1.4.1.2021.13.15.1.1.2.29 = STRING: loop2
.1.3.6.1.4.1.2021.13.15.1.1.2.30 = STRING: loop3
.1.3.6.1.4.1.2021.13.15.1.1.2.31 = STRING: loop4
.1.3.6.1.4.1.2021.13.15.1.1.2.32 = STRING: loop5
.1.3.6.1.4.1.2021.13.15.1.1.2.33 = STRING: loop6
.1.3.6.1.4.1.2021.13.15.1.1.2.34 = STRING: loop7
.1.3.6.1.4.1.2021.13.15.1.1.3.1 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.3.2 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.3.3 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.3.4 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.3.5 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.3.6 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.3.7 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.3.8 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.3.9 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.3.10 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.3.11 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.3.12 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.3.13 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.3.14 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.3.15 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.3.16 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.3.17 = Counter32: 126828544
.1.3.6.1.4.1.2021.13.15.1.1.3.18 = Counter32: 1017856
.1.3.6.1.4.1.2021.13.15.1.1.3.19 = Counter32: 99803648
.1.3.6.1.4.1.2021.13.15.1.1.3.20 = Counter32: 25773568
.1.3.6.1.4.1.2021.13.15.1.1.3.21 = Counter32: 4054875136
.1.3.6.1.4.1.2021.13.15.1.1.3.22 = Counter32: 4054371328
.1.3.6.1.4.1.2021.13.15.1.1.3.23 = Counter32: 4161482752
.1.3.6.1.4.1.2021.13.15.1.1.3.24 = Counter32: 4161183744
.1.3.6.1.4.1.2021.13.15.1.1.3.25 = Counter32: 1059241984
.1.3.6.1.4.1.2021.13.15.1.1.3.26 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.3.27 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.3.28 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.3.29 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.3.30 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.3.31 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.3.32 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.3.33 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.3.34 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.1 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.2 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.3 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.4 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.5 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.6 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.7 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.8 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.9 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.10 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.11 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.12 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.13 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.14 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.15 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.16 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.17 = Counter32: 888755200
.1.3.6.1.4.1.2021.13.15.1.1.4.18 = Counter32: 30720
.1.3.6.1.4.1.2021.13.15.1.1.4.19 = Counter32: 861948928
.1.3.6.1.4.1.2021.13.15.1.1.4.20 = Counter32: 26775552
.1.3.6.1.4.1.2021.13.15.1.1.4.21 = Counter32: 2478964736
.1.3.6.1.4.1.2021.13.15.1.1.4.22 = Counter32: 2478964736
.1.3.6.1.4.1.2021.13.15.1.1.4.23 = Counter32: 4160782336
.1.3.6.1.4.1.2021.13.15.1.1.4.24 = Counter32: 4160782336
.1.3.6.1.4.1.2021.13.15.1.1.4.25 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.26 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.27 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.28 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.29 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.30 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.31 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.32 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.33 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.4.34 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.5.1 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.5.2 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.5.3 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.5.4 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.5.5 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.5.6 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.5.7 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.5.8 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.5.9 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.5.10 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.5.11 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.5.12 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.5.13 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.5.14 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.5.15 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.5.16 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.5.17 = Counter32: 2170942
.1.3.6.1.4.1.2021.13.15.1.1.5.18 = Counter32: 126
.1.3.6.1.4.1.2021.13.15.1.1.5.19 = Counter32: 2169850
.1.3.6.1.4.1.2021.13.15.1.1.5.20 = Counter32: 943
.1.3.6.1.4.1.2021.13.15.1.1.5.21 = Counter32: 8041266
.1.3.6.1.4.1.2021.13.15.1.1.5.22 = Counter32: 8041221
.1.3.6.1.4.1.2021.13.15.1.1.5.23 = Counter32: 51749
.1.3.6.1.4.1.2021.13.15.1.1.5.24 = Counter32: 51739
.1.3.6.1.4.1.2021.13.15.1.1.5.25 = Counter32: 16589
.1.3.6.1.4.1.2021.13.15.1.1.5.26 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.5.27 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.5.28 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.5.29 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.5.30 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.5.31 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.5.32 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.5.33 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.5.34 = Counter32: 0
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.1.3.6.1.4.1.2021.13.15.1.1.6.3 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.6.4 = Counter32: 0
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.1.3.6.1.4.1.2021.13.15.1.1.6.9 = Counter32: 0
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.1.3.6.1.4.1.2021.13.15.1.1.6.15 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.6.16 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.6.17 = Counter32: 3850963
.1.3.6.1.4.1.2021.13.15.1.1.6.18 = Counter32: 24
.1.3.6.1.4.1.2021.13.15.1.1.6.19 = Counter32: 3850807
.1.3.6.1.4.1.2021.13.15.1.1.6.20 = Counter32: 132
.1.3.6.1.4.1.2021.13.15.1.1.6.21 = Counter32: 1544781
.1.3.6.1.4.1.2021.13.15.1.1.6.22 = Counter32: 1544781
.1.3.6.1.4.1.2021.13.15.1.1.6.23 = Counter32: 30217
.1.3.6.1.4.1.2021.13.15.1.1.6.24 = Counter32: 30217
.1.3.6.1.4.1.2021.13.15.1.1.6.25 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.6.26 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.6.27 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.6.28 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.6.29 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.6.30 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.6.31 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.6.32 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.6.33 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.6.34 = Counter32: 0
.1.3.6.1.4.1.2021.13.15.1.1.12.1 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.12.2 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.12.3 = Counter64: 0
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.1.3.6.1.4.1.2021.13.15.1.1.12.7 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.12.8 = Counter64: 0
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.1.3.6.1.4.1.2021.13.15.1.1.12.11 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.12.12 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.12.13 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.12.14 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.12.15 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.12.16 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.12.17 = Counter64: 60256370688
.1.3.6.1.4.1.2021.13.15.1.1.12.18 = Counter64: 1017856
.1.3.6.1.4.1.2021.13.15.1.1.12.19 = Counter64: 60229345792
.1.3.6.1.4.1.2021.13.15.1.1.12.20 = Counter64: 25773568
.1.3.6.1.4.1.2021.13.15.1.1.12.21 = Counter64: 583875460096
.1.3.6.1.4.1.2021.13.15.1.1.12.22 = Counter64: 583874956288
.1.3.6.1.4.1.2021.13.15.1.1.12.23 = Counter64: 4161482752
.1.3.6.1.4.1.2021.13.15.1.1.12.24 = Counter64: 4161183744
.1.3.6.1.4.1.2021.13.15.1.1.12.25 = Counter64: 1059241984
.1.3.6.1.4.1.2021.13.15.1.1.12.26 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.12.27 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.12.28 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.12.29 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.12.30 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.12.31 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.12.32 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.12.33 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.12.34 = Counter64: 0
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.1.3.6.1.4.1.2021.13.15.1.1.13.2 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.13.3 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.13.4 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.13.5 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.13.6 = Counter64: 0
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.1.3.6.1.4.1.2021.13.15.1.1.13.8 = Counter64: 0
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.1.3.6.1.4.1.2021.13.15.1.1.13.10 = Counter64: 0
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.1.3.6.1.4.1.2021.13.15.1.1.13.15 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.13.16 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.13.17 = Counter64: 73903199232
.1.3.6.1.4.1.2021.13.15.1.1.13.18 = Counter64: 30720
.1.3.6.1.4.1.2021.13.15.1.1.13.19 = Counter64: 73876392960
.1.3.6.1.4.1.2021.13.15.1.1.13.20 = Counter64: 26775552
.1.3.6.1.4.1.2021.13.15.1.1.13.21 = Counter64: 84083343360
.1.3.6.1.4.1.2021.13.15.1.1.13.22 = Counter64: 84083343360
.1.3.6.1.4.1.2021.13.15.1.1.13.23 = Counter64: 8455749632
.1.3.6.1.4.1.2021.13.15.1.1.13.24 = Counter64: 8455749632
.1.3.6.1.4.1.2021.13.15.1.1.13.25 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.13.26 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.13.27 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.13.28 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.13.29 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.13.30 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.13.31 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.13.32 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.13.33 = Counter64: 0
.1.3.6.1.4.1.2021.13.15.1.1.13.34 = Counter64: 0
.1.3.6.1.4.1.2021.100.10.0 = INTEGER: 0
.1.3.6.1.4.1.2021.100.11.0 = INTEGER: 0
.1.3.6.1.4.1.2021.100.12.0 = INTEGER: 0
.1.3.6.1.4.1.2021.100.13.0 = INTEGER: 0
.1.3.6.1.4.1.2021.100.20.0 = INTEGER: 0
.1.3.6.1.4.1.2021.101.1.0 = INTEGER: 0
.1.3.6.1.4.1.2021.101.2.0 = STRING: snmp
.1.3.6.1.4.1.2021.101.100.0 = INTEGER: 0
.1.3.6.1.4.1.2021.101.101.0 = STRING: 

この中で気になる値を持つ行にメボシをつけて、MIB情報を調べる。
ここでは、sda1という記載が気になるので、sda1が属する.1.3.6.1.4.1.2021.13.15の情報を調べる。

$ snmpwalk -v 2c -c public 192.168.1.10 .1.3.6.1.4.1.2021.13.15
UCD-DISKIO-MIB::diskIOIndex.1 = INTEGER: 1
UCD-DISKIO-MIB::diskIOIndex.2 = INTEGER: 2
UCD-DISKIO-MIB::diskIOIndex.3 = INTEGER: 3
UCD-DISKIO-MIB::diskIOIndex.4 = INTEGER: 4
UCD-DISKIO-MIB::diskIOIndex.5 = INTEGER: 5
UCD-DISKIO-MIB::diskIOIndex.6 = INTEGER: 6
UCD-DISKIO-MIB::diskIOIndex.7 = INTEGER: 7
UCD-DISKIO-MIB::diskIOIndex.8 = INTEGER: 8
UCD-DISKIO-MIB::diskIOIndex.9 = INTEGER: 9
UCD-DISKIO-MIB::diskIOIndex.10 = INTEGER: 10
UCD-DISKIO-MIB::diskIOIndex.11 = INTEGER: 11
UCD-DISKIO-MIB::diskIOIndex.12 = INTEGER: 12
UCD-DISKIO-MIB::diskIOIndex.13 = INTEGER: 13
UCD-DISKIO-MIB::diskIOIndex.14 = INTEGER: 14
UCD-DISKIO-MIB::diskIOIndex.15 = INTEGER: 15
UCD-DISKIO-MIB::diskIOIndex.16 = INTEGER: 16
UCD-DISKIO-MIB::diskIOIndex.17 = INTEGER: 17
UCD-DISKIO-MIB::diskIOIndex.18 = INTEGER: 18
UCD-DISKIO-MIB::diskIOIndex.19 = INTEGER: 19
UCD-DISKIO-MIB::diskIOIndex.20 = INTEGER: 20
UCD-DISKIO-MIB::diskIOIndex.21 = INTEGER: 21
UCD-DISKIO-MIB::diskIOIndex.22 = INTEGER: 22
UCD-DISKIO-MIB::diskIOIndex.23 = INTEGER: 23
UCD-DISKIO-MIB::diskIOIndex.24 = INTEGER: 24
UCD-DISKIO-MIB::diskIOIndex.25 = INTEGER: 25
UCD-DISKIO-MIB::diskIOIndex.26 = INTEGER: 26
UCD-DISKIO-MIB::diskIOIndex.27 = INTEGER: 27
UCD-DISKIO-MIB::diskIOIndex.28 = INTEGER: 28
UCD-DISKIO-MIB::diskIOIndex.29 = INTEGER: 29
UCD-DISKIO-MIB::diskIOIndex.30 = INTEGER: 30
UCD-DISKIO-MIB::diskIOIndex.31 = INTEGER: 31
UCD-DISKIO-MIB::diskIOIndex.32 = INTEGER: 32
UCD-DISKIO-MIB::diskIOIndex.33 = INTEGER: 33
UCD-DISKIO-MIB::diskIOIndex.34 = INTEGER: 34
UCD-DISKIO-MIB::diskIODevice.1 = STRING: ram0
UCD-DISKIO-MIB::diskIODevice.2 = STRING: ram1
UCD-DISKIO-MIB::diskIODevice.3 = STRING: ram2
UCD-DISKIO-MIB::diskIODevice.4 = STRING: ram3
UCD-DISKIO-MIB::diskIODevice.5 = STRING: ram4
UCD-DISKIO-MIB::diskIODevice.6 = STRING: ram5
UCD-DISKIO-MIB::diskIODevice.7 = STRING: ram6
UCD-DISKIO-MIB::diskIODevice.8 = STRING: ram7
UCD-DISKIO-MIB::diskIODevice.9 = STRING: ram8
UCD-DISKIO-MIB::diskIODevice.10 = STRING: ram9
UCD-DISKIO-MIB::diskIODevice.11 = STRING: ram10
UCD-DISKIO-MIB::diskIODevice.12 = STRING: ram11
UCD-DISKIO-MIB::diskIODevice.13 = STRING: ram12
UCD-DISKIO-MIB::diskIODevice.14 = STRING: ram13
UCD-DISKIO-MIB::diskIODevice.15 = STRING: ram14
UCD-DISKIO-MIB::diskIODevice.16 = STRING: ram15
UCD-DISKIO-MIB::diskIODevice.17 = STRING: sda
UCD-DISKIO-MIB::diskIODevice.18 = STRING: sda1
UCD-DISKIO-MIB::diskIODevice.19 = STRING: sda2
UCD-DISKIO-MIB::diskIODevice.20 = STRING: sda3
UCD-DISKIO-MIB::diskIODevice.21 = STRING: sdb
UCD-DISKIO-MIB::diskIODevice.22 = STRING: sdb1
UCD-DISKIO-MIB::diskIODevice.23 = STRING: sdc
UCD-DISKIO-MIB::diskIODevice.24 = STRING: sdc1
UCD-DISKIO-MIB::diskIODevice.25 = STRING: sr0
UCD-DISKIO-MIB::diskIODevice.26 = STRING: md0
UCD-DISKIO-MIB::diskIODevice.27 = STRING: loop0
UCD-DISKIO-MIB::diskIODevice.28 = STRING: loop1
UCD-DISKIO-MIB::diskIODevice.29 = STRING: loop2
UCD-DISKIO-MIB::diskIODevice.30 = STRING: loop3
UCD-DISKIO-MIB::diskIODevice.31 = STRING: loop4
UCD-DISKIO-MIB::diskIODevice.32 = STRING: loop5
UCD-DISKIO-MIB::diskIODevice.33 = STRING: loop6
UCD-DISKIO-MIB::diskIODevice.34 = STRING: loop7
UCD-DISKIO-MIB::diskIONRead.1 = Counter32: 0
UCD-DISKIO-MIB::diskIONRead.2 = Counter32: 0
UCD-DISKIO-MIB::diskIONRead.3 = Counter32: 0
UCD-DISKIO-MIB::diskIONRead.4 = Counter32: 0
UCD-DISKIO-MIB::diskIONRead.5 = Counter32: 0
UCD-DISKIO-MIB::diskIONRead.6 = Counter32: 0
UCD-DISKIO-MIB::diskIONRead.7 = Counter32: 0
UCD-DISKIO-MIB::diskIONRead.8 = Counter32: 0
UCD-DISKIO-MIB::diskIONRead.9 = Counter32: 0
UCD-DISKIO-MIB::diskIONRead.10 = Counter32: 0
UCD-DISKIO-MIB::diskIONRead.11 = Counter32: 0
UCD-DISKIO-MIB::diskIONRead.12 = Counter32: 0
UCD-DISKIO-MIB::diskIONRead.13 = Counter32: 0
UCD-DISKIO-MIB::diskIONRead.14 = Counter32: 0
UCD-DISKIO-MIB::diskIONRead.15 = Counter32: 0
UCD-DISKIO-MIB::diskIONRead.16 = Counter32: 0
UCD-DISKIO-MIB::diskIONRead.17 = Counter32: 130445312
UCD-DISKIO-MIB::diskIONRead.18 = Counter32: 1017856
UCD-DISKIO-MIB::diskIONRead.19 = Counter32: 103420416
UCD-DISKIO-MIB::diskIONRead.20 = Counter32: 25773568
UCD-DISKIO-MIB::diskIONRead.21 = Counter32: 113351680
UCD-DISKIO-MIB::diskIONRead.22 = Counter32: 112847872
UCD-DISKIO-MIB::diskIONRead.23 = Counter32: 4161482752
UCD-DISKIO-MIB::diskIONRead.24 = Counter32: 4161183744
UCD-DISKIO-MIB::diskIONRead.25 = Counter32: 1059241984
UCD-DISKIO-MIB::diskIONRead.26 = Counter32: 0
UCD-DISKIO-MIB::diskIONRead.27 = Counter32: 0
UCD-DISKIO-MIB::diskIONRead.28 = Counter32: 0
UCD-DISKIO-MIB::diskIONRead.29 = Counter32: 0
UCD-DISKIO-MIB::diskIONRead.30 = Counter32: 0
UCD-DISKIO-MIB::diskIONRead.31 = Counter32: 0
UCD-DISKIO-MIB::diskIONRead.32 = Counter32: 0
UCD-DISKIO-MIB::diskIONRead.33 = Counter32: 0
UCD-DISKIO-MIB::diskIONRead.34 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.1 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.2 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.3 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.4 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.5 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.6 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.7 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.8 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.9 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.10 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.11 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.12 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.13 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.14 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.15 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.16 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.17 = Counter32: 965694464
UCD-DISKIO-MIB::diskIONWritten.18 = Counter32: 30720
UCD-DISKIO-MIB::diskIONWritten.19 = Counter32: 938888192
UCD-DISKIO-MIB::diskIONWritten.20 = Counter32: 26775552
UCD-DISKIO-MIB::diskIONWritten.21 = Counter32: 2534469632
UCD-DISKIO-MIB::diskIONWritten.22 = Counter32: 2534469632
UCD-DISKIO-MIB::diskIONWritten.23 = Counter32: 4160782336
UCD-DISKIO-MIB::diskIONWritten.24 = Counter32: 4160782336
UCD-DISKIO-MIB::diskIONWritten.25 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.26 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.27 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.28 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.29 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.30 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.31 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.32 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.33 = Counter32: 0
UCD-DISKIO-MIB::diskIONWritten.34 = Counter32: 0
UCD-DISKIO-MIB::diskIOReads.1 = Counter32: 0
UCD-DISKIO-MIB::diskIOReads.2 = Counter32: 0
UCD-DISKIO-MIB::diskIOReads.3 = Counter32: 0
UCD-DISKIO-MIB::diskIOReads.4 = Counter32: 0
UCD-DISKIO-MIB::diskIOReads.5 = Counter32: 0
UCD-DISKIO-MIB::diskIOReads.6 = Counter32: 0
UCD-DISKIO-MIB::diskIOReads.7 = Counter32: 0
UCD-DISKIO-MIB::diskIOReads.8 = Counter32: 0
UCD-DISKIO-MIB::diskIOReads.9 = Counter32: 0
UCD-DISKIO-MIB::diskIOReads.10 = Counter32: 0
UCD-DISKIO-MIB::diskIOReads.11 = Counter32: 0
UCD-DISKIO-MIB::diskIOReads.12 = Counter32: 0
UCD-DISKIO-MIB::diskIOReads.13 = Counter32: 0
UCD-DISKIO-MIB::diskIOReads.14 = Counter32: 0
UCD-DISKIO-MIB::diskIOReads.15 = Counter32: 0
UCD-DISKIO-MIB::diskIOReads.16 = Counter32: 0
UCD-DISKIO-MIB::diskIOReads.17 = Counter32: 2171295
UCD-DISKIO-MIB::diskIOReads.18 = Counter32: 126
UCD-DISKIO-MIB::diskIOReads.19 = Counter32: 2170203
UCD-DISKIO-MIB::diskIOReads.20 = Counter32: 943
UCD-DISKIO-MIB::diskIOReads.21 = Counter32: 8104854
UCD-DISKIO-MIB::diskIOReads.22 = Counter32: 8104809
UCD-DISKIO-MIB::diskIOReads.23 = Counter32: 51749
UCD-DISKIO-MIB::diskIOReads.24 = Counter32: 51739
UCD-DISKIO-MIB::diskIOReads.25 = Counter32: 16589
UCD-DISKIO-MIB::diskIOReads.26 = Counter32: 0
UCD-DISKIO-MIB::diskIOReads.27 = Counter32: 0
UCD-DISKIO-MIB::diskIOReads.28 = Counter32: 0
UCD-DISKIO-MIB::diskIOReads.29 = Counter32: 0
UCD-DISKIO-MIB::diskIOReads.30 = Counter32: 0
UCD-DISKIO-MIB::diskIOReads.31 = Counter32: 0
UCD-DISKIO-MIB::diskIOReads.32 = Counter32: 0
UCD-DISKIO-MIB::diskIOReads.33 = Counter32: 0
UCD-DISKIO-MIB::diskIOReads.34 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.1 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.2 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.3 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.4 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.5 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.6 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.7 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.8 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.9 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.10 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.11 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.12 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.13 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.14 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.15 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.16 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.17 = Counter32: 3858330
UCD-DISKIO-MIB::diskIOWrites.18 = Counter32: 24
UCD-DISKIO-MIB::diskIOWrites.19 = Counter32: 3858174
UCD-DISKIO-MIB::diskIOWrites.20 = Counter32: 132
UCD-DISKIO-MIB::diskIOWrites.21 = Counter32: 1549739
UCD-DISKIO-MIB::diskIOWrites.22 = Counter32: 1549739
UCD-DISKIO-MIB::diskIOWrites.23 = Counter32: 30217
UCD-DISKIO-MIB::diskIOWrites.24 = Counter32: 30217
UCD-DISKIO-MIB::diskIOWrites.25 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.26 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.27 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.28 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.29 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.30 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.31 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.32 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.33 = Counter32: 0
UCD-DISKIO-MIB::diskIOWrites.34 = Counter32: 0
UCD-DISKIO-MIB::diskIONReadX.1 = Counter64: 0
UCD-DISKIO-MIB::diskIONReadX.2 = Counter64: 0
UCD-DISKIO-MIB::diskIONReadX.3 = Counter64: 0
UCD-DISKIO-MIB::diskIONReadX.4 = Counter64: 0
UCD-DISKIO-MIB::diskIONReadX.5 = Counter64: 0
UCD-DISKIO-MIB::diskIONReadX.6 = Counter64: 0
UCD-DISKIO-MIB::diskIONReadX.7 = Counter64: 0
UCD-DISKIO-MIB::diskIONReadX.8 = Counter64: 0
UCD-DISKIO-MIB::diskIONReadX.9 = Counter64: 0
UCD-DISKIO-MIB::diskIONReadX.10 = Counter64: 0
UCD-DISKIO-MIB::diskIONReadX.11 = Counter64: 0
UCD-DISKIO-MIB::diskIONReadX.12 = Counter64: 0
UCD-DISKIO-MIB::diskIONReadX.13 = Counter64: 0
UCD-DISKIO-MIB::diskIONReadX.14 = Counter64: 0
UCD-DISKIO-MIB::diskIONReadX.15 = Counter64: 0
UCD-DISKIO-MIB::diskIONReadX.16 = Counter64: 0
UCD-DISKIO-MIB::diskIONReadX.17 = Counter64: 60259987456
UCD-DISKIO-MIB::diskIONReadX.18 = Counter64: 1017856
UCD-DISKIO-MIB::diskIONReadX.19 = Counter64: 60232962560
UCD-DISKIO-MIB::diskIONReadX.20 = Counter64: 25773568
UCD-DISKIO-MIB::diskIONReadX.21 = Counter64: 588523871232
UCD-DISKIO-MIB::diskIONReadX.22 = Counter64: 588523367424
UCD-DISKIO-MIB::diskIONReadX.23 = Counter64: 4161482752
UCD-DISKIO-MIB::diskIONReadX.24 = Counter64: 4161183744
UCD-DISKIO-MIB::diskIONReadX.25 = Counter64: 1059241984
UCD-DISKIO-MIB::diskIONReadX.26 = Counter64: 0
UCD-DISKIO-MIB::diskIONReadX.27 = Counter64: 0
UCD-DISKIO-MIB::diskIONReadX.28 = Counter64: 0
UCD-DISKIO-MIB::diskIONReadX.29 = Counter64: 0
UCD-DISKIO-MIB::diskIONReadX.30 = Counter64: 0
UCD-DISKIO-MIB::diskIONReadX.31 = Counter64: 0
UCD-DISKIO-MIB::diskIONReadX.32 = Counter64: 0
UCD-DISKIO-MIB::diskIONReadX.33 = Counter64: 0
UCD-DISKIO-MIB::diskIONReadX.34 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.1 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.2 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.3 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.4 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.5 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.6 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.7 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.8 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.9 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.10 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.11 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.12 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.13 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.14 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.15 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.16 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.17 = Counter64: 73980138496
UCD-DISKIO-MIB::diskIONWrittenX.18 = Counter64: 30720
UCD-DISKIO-MIB::diskIONWrittenX.19 = Counter64: 73953332224
UCD-DISKIO-MIB::diskIONWrittenX.20 = Counter64: 26775552
UCD-DISKIO-MIB::diskIONWrittenX.21 = Counter64: 84138848256
UCD-DISKIO-MIB::diskIONWrittenX.22 = Counter64: 84138848256
UCD-DISKIO-MIB::diskIONWrittenX.23 = Counter64: 8455749632
UCD-DISKIO-MIB::diskIONWrittenX.24 = Counter64: 8455749632
UCD-DISKIO-MIB::diskIONWrittenX.25 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.26 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.27 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.28 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.29 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.30 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.31 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.32 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.33 = Counter64: 0
UCD-DISKIO-MIB::diskIONWrittenX.34 = Counter64: 0

得られた出力結果より、該当のOIDはdiskIOに関するものだとわかった。
また、２つの出力結果を照らし合わせると、
.1.3.6.1.4.1.2021.13.15.1.1.2.18 = STRING: sda1 <=> UCD-DISKIO-MIB::diskIODevice.18 = STRING: sda1
末尾の"18"がsda1を示していることがわかる。さらに、18の手前の"2"がdiskIODeviceを示していることもわかる。
sda1について得られる情報は以下のとおり。

参照URL †

http://park1.wakwak.com/~ima/freebsd_netsnmpoidlist.html ごった煮 - FreeBSD導入記(覚え書き) - net-snmp OID一覧
http://www.itmedia.co.jp/enterprise/articles/0705/21/news015.html SNMPによるネットワークモニタリング「第2版」：第5回　図解で知るSNMP――MIB情報のすべて (1/8) - ITmedia エンタープライズ