Troubleshooting CIFS Latency - Single volume readdir workloads with high latency

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Views:: 5,446

Visibility:: Public

Votes:: 2

Category:: ontap-9

Specialty:: perf

Last Updated:

Applies to

ONTAP 9
Clustered Data ONTAP
Data ONTAP operating in 7-Mode
Slow CIFS Home Directories
Slow VDI (Hyper-V) or Citrix Home Profiles using folder redirection.

Issue

Slow loading of a home directory or VDI folder in Citrix due to thousands of user folders in the root of a CIFS share
High latency is seen:
- In the Data column of qos statistics volume latency show
- Data Processing delay center of AIQUM in the volume view of Cluster components
- High "other" latency (SMB2 Create/Open, Close, Readdir, Lookup operations)
Example:

Workload            ID    Latency    Network    Cluster       Data       Disk        QoS      NVRAM

--------------- ------ ---------- ---------- ---------- ----------  ---------  ---------  ---------

-total-              -   136.49ms    99.00us    70.00us   136.17ms   153.00us        0ms        0ms

vserver1_vol1..   4201   206.05ms   130.00us        0ms   205.88ms    44.00us        0ms        0ms

vserver5_vol8..   7704  1309.00us   351.00us     1.00us   834.00us   114.00us        0ms     9.00us

-total-              -   140.29ms   103.00us    75.00us   139.94ms   174.00us        0ms        0ms

vserver1_vol1..   4201   379.03ms   127.00us        0ms   378.73ms   175.00us        0ms        0ms

vserver5_vol8..   7704     2.02ms   309.00us     1.30us  1820.00us   105.00us        0ms     9.00us