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Vscanのレイテンシが原因でレイテンシとタイムアウトが増加

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Category:
ontap-9
Specialty:
nas
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環境

  • ONTAP 9
  • Vscan

問題

  • ファイルへのアクセスが非常に遅い
  • ファイルのコピー時にレイテンシが増加
  • EMSのログに Nblade_CifsOperationTimedOut エラーが表示されることがあります: 
kernel: Nblade_CifsOperationTimedOut_1:error]: params: {'remoteBladeID': '<id> (<node_name>)', 'cmdRestartCnt': '0', 'vserverId': '7', 'commandName': 'SMB2_COM_CREATE', 'isQosEnabled': 'QoS_disabled', 'lastSpinNpError': 'SPINNP_ERR_OFFBOX_VSCAN_REQD', 'localIpAddress': '10.xx.xx.xx', 'lastCsmError': 'CSM_OK', 'clientIpAddress': '10.xx.xx.xx', 'vserverName': '<svm_name>', 'suspensionCnt': '<count>', 'dsId': '<id>'}
 
Tue May 21 10:36:18 +0900 [node-01: kernel: ems.engine.suppressed:debug]: Event 'Nblade.CifsOperationTimedOut' suppressed 60 times in last 273 seconds.
  • vscan-events.xmlに scan-internal-errortimedout  メッセージとscan- メッセージが表示されることがある

  • パフォーマンスアーカイブには   、VSCANサーバでの高レイテンシが示されています。

  Cluster: cluster1 (4cfa91c5-761a-xxxxx-xxxxx-xxxxxxx)
   Node: node1 (4cfa91c5-761a-xxxxx-xxxxx-xxxxxxx)
   Time Range: 2024-07-21 18:00:00.999+00:00 - 2024-07-22 00:00:00.001+00:00
time interval              offbox_vscan_server          offbox_vscan_server offbox_vscan_server
                    instance                   scan_latency  scan_latency_base
                                         (us)
------------------------------------  -----------------------------------  -------------------  -------------------
2024-07-21 18:31:18 - 18:36:18+00:00  svm1:10.x.x.1:node1               129298.60          5
2024-07-21 18:36:18 - 18:41:18+00:00  svm1:10.x.x.1:node1               121461.00           3
2024-07-21 18:41:18 - 18:46:18+00:00  svm1:10.x.x.1:node1               152285.50
2024-07-21 18:56:18 - 19:01:18+00:00  svm1:10.x.x.1:node1               243688.50
2024-07-21 19:01:18 - 19:06:18+00:00  svm1:10.x.x.1:node1               314138.00
2024-07-21 19:11:18 - 19:16:18+00:00  svm1:10.x.x.1:node1               141676.00
2024-07-21 19:16:18 - 19:21:18+00:00  svm1:10.x.x.1:node1               143551.20           5
2024-07-21 19:21:18 - 19:26:18+00:00  svm1:10.x.x.1:node1               138153.50
2024-07-21 19:26:18 - 19:31:18+00:00  svm1:10.x.x.1:node1               366887.00           3
2024-07-21 19:31:18 - 19:36:18+00:00  svm1:10.x.x.1:node1              1776264.29          7
2024-07-21 19:36:18 - 19:41:18+00:00  svm1:10.x.x.1:node1               390445.80           5
2024-07-21 19:41:18 - 19:46:18+00:00  svm1:10.x.x.1:node1              2185337.75          4
2024-07-21 19:46:18 - 19:51:18+00:00  svm1:10.x.x.1:node1               342919.09           11
2024-07-21 19:51:18 - 19:56:18+00:00  svm1:10.x.x.1:node1               566124.60           10

 

QoS統計ボリュームレイテンシ表示では、AVSCAN列に高いレイテンシが表示されている

nas01::*> qos statistics volume latency show -volume vol1 -vserver svm1 Workload ID Latency Network Cluster Data Disk QoS Max QoS Min NVRAM Cloud FlexCache SM Sync VA AVSCAN --------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- vol1-w.. 19566 16.32s 117.00us 153.00us 70.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms 16.32s -total- - 9.39ms 31.00us 0ms 37.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms 9.32ms vol1-w.. 19566 22.77s 146.00us 198.00us 73.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms 22.77s

 

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