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Some applications not performing well on FlexCache volume

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Category:
ontap-9
Specialty:
nas
Last Updated:

Applies to

  • ONTAP 9
  • FlexCache
  • CIFS/SMB

Issue

Poor performance experienced by users working with an application that accesses files stored on a ONTAP CIFS share on a  FlexCache

  • SMB2 Service Response Times (SRT) from packet trace collected on the ONTAP node
 
===========================================================================
SMB2 Service Response Time Statistics - e0a_20251009_072351.trc0:
Index  Procedure  Calls  Min SRT (s)  Max SRT (s)  Avg SRT (s)  Sum SRT (s)
---------------------------------------------------------------------------
SMB2
Close          6   7797     0.000022     0.357435     0.004638    36.161835
Create         5   8170     0.000075     3.059123     0.015026   122.763699
Find          14   1920     0.000025     1.604687     0.032183    61.792121
GetInfo       16   4383     0.000039     0.094130     0.002366    10.371389
Ioctl         11     33     0.000050     0.000479     0.000150     0.004939
Notify        15     11     1.585816   376.230103    49.690147   546.591618
Read           8  12285     0.000030     2.493342     0.004877    59.915164
SetInfo       17    640     0.000053     0.058788     0.014454     9.250445
Tree Connect   3      7     0.000081     0.000131     0.000105     0.000734
Tree Disconnec 4      7     0.000067     0.000097     0.000082     0.000576
Write          9  34371     0.000081     1.013845     0.012086   415.424646
SMB2
---------------------------------------------------------------------------
 
  • Observations:
    • More Write intensive workload
    • Relatively high number of Create and Close calls

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