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CIFS access slow due to lnk files in a root or subdirectory of a volume

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Category:
ontap-9
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nas
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Applies to

  • ONTAP 9
  • Microsoft Windows
  • CIFS

Issue

  • User access to a directory and/or any subdirectory under that folder via Windows clients can exhibit slow performance
  • Output from qos statistics volume latency show showed under 1-5 ms of latency
  • No errors are logged in event log show that point to obvious problems
  • This is more apparent on users further away from storage (VPN or WAN) than locally accessible machines
  • There are many packets on .lnk files in a packet trace similar to below:
    • Create Request File: Windows (C) - Shortcut (3).lnk
      Create Response File: Windows (C) - Shortcut (3).lnk
      GetInfo Request SEC_INFO/SMB2_SEC_INFO_00 File: Windows (C) - Shortcut (3).lnk
      GetInfo Response, Error: STATUS_ACCESS_DENIED
      Read Request Len:518 Off:0 File: Windows (C) - Shortcut (3).lnk
      Read Response
      Create Request File: Windows (C) - Shortcut (4).lnk
      Create Response File: Windows (C) - Shortcut (4).lnk
      GetInfo Request SEC_INFO/SMB2_SEC_INFO_00 File: Windows (C) - Shortcut (4).lnk
      GetInfo Response, Error: STATUS_ACCESS_DENIED
      Read Request Len:518 Off:0 File: Windows (C) - Shortcut (4).lnk
      Read Response
      Create Request File: Windows (C) - Shortcut (5).lnk
      Create Response File: Windows (C) - Shortcut (5).lnk

 

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