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Bad response of vscan server causes high volume latency

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Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

ONTAP 9

Issue

  • High read/write latency due to bad response from vscan server.
  • scan_request_timedout can be seen by following the below steps.
  • ASUP -> VSCAN-EVENTS.XML or vserver vscan show-events command via advanced mode may report:
    • scan-internal-error
    • scanner-busy
    • scan-timedout
  • ASUP -> VSCAN-CONNECTION-STATUS-ALL.XML may report that the vscan servers configured on the CIFS vserver are disconnected.
  • Start collecting the statistics by running the below command and then reproduce the slowness issue:

cluster1::> set -privilege diag
cluster1::*> statistics start -object offbox_vscan_server -sample-id vscan_test1

  • Stop the statistics once the issue is reproduced:

cluster1::*> statistics stop -object offbox_vscan_server -sample-id vscan_test1

  • To view the statistics, use the command below to check for the total requests dispatched and the number of requests timedout . The below example shows all 11 requests dispatched were timedout which happens due to a bad vserver response:

cluster1::*> statistics samples show -sample-id vscan_test1
Object: offbox_vscan_server
Instance: cluster_name:<node IP>:Node_name
Start-time: 3/6/2024 12:09:18
End-time: 3/6/2024 12:15:59
Elapsed-time: 401s
Scope: scope_name
Number of Constituents: 1 (complete_aggregation)
    Counter                                                     Value
    -------------------------------- --------------------------------
    scan_request_dispatched                                        11
    scan_request_dispatched_rate                                    0
    scan_request_pending                                            1
    scan_request_requeued                                           0
    scan_request_timedout                                          11

 

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