Collectd 和石墨每 5 分鐘導入一次數據，而不是 1 分鐘

我對石墨有點陌生，所以請耐心等待。我正在尋找一個大型且相當笨重的仙人掌裝置的替代品，所以我一直在玩石墨。我們通過 SNMP 提取大量數據，因此我還下載、編譯並安裝了 collectd 以將 SNMP 數據傳輸到石墨中。

我在 collectd 中設置了一個簡單的查詢來獲取目前eth0的輸入/輸出計數器。我希望以一分鐘的解析度捕捉一周，然後是 5 分鐘，所以我的storage-schemas.conf樣子是這樣的：

[carbon]
pattern = ^carbon\.
retentions = 60:90d

[default]
pattern = .*
retentions = 60s:1w, 5m:1y

同樣，在collectd.conf我設置了以下內容：

<Plugin snmp>
  <Data "std_traffic">
      Type "if_octets"
      Table true
      Instance "IF-MIB::ifDescr"
      Values "IF-MIB::ifInOctets" "IF-MIB::ifOutOctets"
  </Data>

  <Host "lonsbrndlb01">
      Address "lonsbrndlb01"
      Version 2
      Community "public"
      Collect "std_traffic"
      Interval 60
  </Host>
</Plugin>

這幾乎完美無缺。密鑰出現在石墨中，數據進入。

唯一的問題是數據是一個計數器，而不是每分鐘的速率。我可以通過使用該derivative函式在石墨中解決這個問題，據說該函式將計數器轉換為每分鐘速率。但是，這樣做，我看到了這張圖：

很明顯，數據僅每 5 分鐘到達一次，而不是我指定的每 60 秒到達一次。為什麼是這樣？我以為我會在 collectd 和石墨中設置正確的值，所以我認為我在某處遺漏了一些東西。

編輯

關於這方面的更多數據，因為它可能有用。

我使用的公式只是derivative(lonsbrndlb01.snmp.if_octets-eth0.tx)and derivative(lonsbrndlb01.snmp.if_octets-eth0.rx)，儘管由於計數器翻轉，我現在已經切換到使用 nonNegativeDerivative。我還更新了下圖以提供比例感。

whisper-dump.py在文件上執行rx.wsp會給出以下標題：

Meta data:
 aggregation method: average
 max retention: 31536000
 xFilesFactor: 0.5

Archive 0 info:
 offset: 40
 seconds per point: 60
 points: 10080
 retention: 604800
 size: 120960

Archive 1 info:
 offset: 121000
 seconds per point: 300
 points: 105120
 retention: 31536000
 size: 1261440

其次是大約 2.4M 的數據。

通過附加從圖中得到的數據&format=json是：

[{"target": "nonNegativeDerivative(lonsbrndlb01.snmp.if_octets-eth0.rx)", "datapoints": [[null, 1342597800], [26346975.0, 1342597860], [35197821.0, 1342597920], [138121.0, 1342597980], [108605.0, 1342598040], [690712.0, 1342598100], [27213713.0, 1342598160], [876898.0, 1342598220], [463897.0, 1342598280], [137499.0, 1342598340], [96980.0, 1342598400], [26237641.0, 1342598460], [35094898.0, 1342598520], [112569.0, 1342598580], [274897.0, 1342598640], [139174.0, 1342598700], [806881.0, 1342598760], [26206311.0, 1342598820], [112298.0, 1342598880], [781205.0, 1342598940], [606872.0, 1342599000], [5184462.0, 1342599060], [61946135.0, 1342599120], [4126005.0, 1342599180], [115908.0, 1342599240], [714159.0, 1342599300], [195738.0, 1342599360], [26261781.0, 1342599420], [100503.0, 1342599480], [751322.0, 1342599540], [930865.0, 1342599600], [230666.0, 1342599660], [59636.0, 1342599720], [62575579.0, 1342599780], [104950.0, 1342599840], [1208886.0, 1342599900], [379369.0, 1342599960], [785827.0, 1342600020], [26215475.0, 1342600080], [221604.0, 1342600140], [351866.0, 1342600200], [231163.0, 1342600260], [211398.0, 1342600320], [70770807.0, 1342600380], [429324.0, 1342600440], [1937893.0, 1342600500], [1476961.0, 1342600560], [72383.0, 1342600620], [371513.0, 1342600680], [29186024.0, 1342600740], [1924055.0, 1342600800], [280068.0, 1342600860], [341216.0, 1342600920], [36643885.0, 1342600980], [26708952.0, 1342601040], [259828.0, 1342601100], [488406.0, 1342601160], [230698.0, 1342601220], [766407.0, 1342601280], [28252848.0, 1342601340]]}, {"target": "nonNegativeDerivative(lonsbrndlb01.snmp.if_octets-eth0.tx)", "datapoints": [[null, 1342597800], [26007032.0, 1342597860], [34808859.0, 1342597920], [100498.0, 1342597980], [91818.0, 1342598040], [649666.0, 1342598100], [26566941.0, 1342598160], [895897.0, 1342598220], [478867.0, 1342598280], [100242.0, 1342598340], [81130.0, 1342598400], [25908859.0, 1342598460], [34659481.0, 1342598520], [75295.0, 1342598580], [285061.0, 1342598640], [103644.0, 1342598700], [824177.0, 1342598760], [25884962.0, 1342598820], [93420.0, 1342598880], [799160.0, 1342598940], [582373.0, 1342599000], [5024696.0, 1342599060], [61269813.0, 1342599120], [3336907.0, 1342599180], [436657.0, 1342599240], [696692.0, 1342599300], [182144.0, 1342599360], [25947578.0, 1342599420], [79011.0, 1342599480], [733857.0, 1342599540], [1015395.0, 1342599600], [184960.0, 1342599660], [48026.0, 1342599720], [61462810.0, 1342599780], [89187.0, 1342599840], [1195360.0, 1342599900], [386772.0, 1342599960], [744445.0, 1342600020], [25913548.0, 1342600080], [201978.0, 1342600140], [344650.0, 1342600200], [199421.0, 1342600260], [208959.0, 1342600320], [69924581.0, 1342600380], [381593.0, 1342600440], [1610764.0, 1342600500], [1484192.0, 1342600560], [41585.0, 1342600620], [373375.0, 1342600680], [28478208.0, 1342600740], [1893711.0, 1342600800], [253921.0, 1342600860], [354558.0, 1342600920], [36199040.0, 1342600980], [26395675.0, 1342601040], [239238.0, 1342601100], [477775.0, 1342601160], [212554.0, 1342601220], [752374.0, 1342601280], [27890202.0, 1342601340]]}]

它可能是峰值數據，但這個盒子不可能每隔幾分鐘就達到 60MBit 的流量峰值。

如果您在適當的 Whisper 文件上使用 Whisper-dump.py 命令，它會顯示什麼？從圖表上看，它並不是每 5 分鐘一次。您是否有可能只是獲得尖峰網路流量？此外，對於計數器，使用 nonNegativeDerivative 而不是 Derivative 總是一個好主意，因為 nonNegative 版本考慮了翻轉。

引用自：https://serverfault.com/questions/408547