Slow CIFS/SMB File Copy Performance Over WAN

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Visibility:: Public

Votes:: 0

Category:: ontap-9

Specialty:: nas

Last Updated:

Applies to

ONTAP 9
CIFS
Environment using WAN

Issue

Users observe significantly slower file copy speeds when transferring data from a NetApp CIFS/SMB share to remote sites over a high-latency WAN, while local site transfers remain fast.
Local site copy speeds are high (~200Mbps) and remote site copy speeds are much slower (~45 Mbps)
ONTAP qos latency for affected volume is consistently low. (~3 ms)

_{::> qos statistics volume latency show -volume volume1 -vserver svm1}
_{Workload ID Latency Network Cluster Data Disk QoS Max QoS Min NVRAM Cloud FlexCache SM Sync VA AVSCAN}
_{--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------}
_{-total- - 478.00us 179.00us 72.00us 102.00us 122.00us 0ms 0ms 3.00us 0ms 0ms 0ms 0ms 0ms}
_{volume1 57348 1.88ms 86.00us 43.00us 832.00us 917.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms}
_{-total- - 278.00us 39.00us 62.00us 65.00us 111.00us 0ms 0ms 1.00us 0ms 0ms 0ms 0ms 0ms}
_{volume1 57348 2.11ms 78.00us 48.00us 814.00us 1168.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms}
_{-total- - 252.00us 40.00us 63.00us 65.00us 83.00us 0ms 0ms 1.00us 0ms 0ms 0ms 0ms 0ms}
_{volume1 57348 1.70ms 77.00us 48.00us 619.00us 960.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms}
_{-total- - 243.00us 40.00us 63.00us 69.00us 69.00us 0ms 0ms 2.00us 0ms 0ms 0ms 0ms 0ms}
_{volume1 57348 1119.00us 73.00us 43.00us 581.00us 422.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms}
_{-total- - 223.00us 43.00us 71.00us 53.00us 54.00us 0ms 0ms 2.00us 0ms 0ms 0ms 0ms 0ms}
_{volume1 57348 1078.00us 80.00us 48.00us 530.00us 420.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms}
_{-total- - 225.00us 41.00us 68.00us 52.00us 62.00us 0ms 0ms 2.00us 0ms 0ms 0ms 0ms 0ms}
_{volume1 57348 1.60ms 89.00us 52.00us 561.00us 898.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms}
_{-total- - 188.00us 40.00us 60.00us 35.00us 51.00us 0ms 0ms 2.00us 0ms 0ms 0ms 0ms 0ms}

Packet traces show no storage-side delays

===========================================================================
SMB2 Service Response Time Statistics:
Index Procedure Calls Min SRT (s) Max SRT (s) Avg SRT (s) Sum SRT (s)
---------------------------------------------------------------------------
SMB2
Close 6 8 0.000045 0.000144 0.000104 0.000834
Create 5 14 0.000030 0.011760 0.001081 0.015127
Find 14 5 0.000195 0.033704 0.018225 0.091123
GetInfo 16 5 0.000032 0.000038 0.000034 0.000172
Ioctl 11 4 0.000033 0.000196 0.000115 0.000458
Read 8 12 0.000036 0.021576 0.003578 0.042934
Tree Connect 3 1 0.000055 0.000055 0.000055 0.000055
Write 9 1 0.000049 0.000049 0.000049 0.000049
SMB2
---------------------------------------------------------------------------