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CONTAP-141955: Poor performance because ONTAP does not implement SMB directory leasing and slow Access Based Enumeration

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ontap-9
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nas
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Issue

  • 100+ms latency FlexGroup with some 10-12k user directories with Access-Based Enumeration (ABE) enabled.
  • Extra SMB3 calls are seen crawling the file tree with SMB3 Create (open, not actually creating the file)/Close calls for all the subfolders all the way to the root of the share for each file operation.
    • Example: One SMB3 op Create/Close set will be for /folder1/folder2/folder3/folder4, the next set will be /folder1/folder2/folder3, and so on, until the next file op for folder4 is done.

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