topic Re: Hyper-v over SMB in ONTAP Discussions

Hyper-v over SMB

edununes — Wed, 04 Jun 2025 09:59:57 GMT

I'm experiencing a problem where I'm seeing a lot of indirect access to the share, I have a data lif on each controller and it's configured in the dns with the same cifs server name for each lif, my doubt is how I guarantee it will be accessed through the lif from node where is the volume/share hosted?

Re: Hyper-v over SMB

AlexDawson — Tue, 14 Jun 2022 19:20:56 GMT

What version of ONTAP are you running and is CIFS configured to run in SMB 3.0 mode with continuous availability?

Re: Hyper-v over SMB

edununes — Tue, 14 Jun 2022 20:07:42 GMT

Alex,
We are using version 9.9.1P9 with SMB 3 and continuos availability.

Re: Hyper-v over SMB

AlexDawson — Tue, 14 Jun 2022 23:38:19 GMT

Thanks! I see you have found this post - https://community.netapp.com/t5/ONTAP-Discussions/Automatic-node-referrals-CIFS-and-support-for-Hyper-V/td-p/147402 - I have not replied to that one as it is so old, but I think their problem was that they only have data volumes/aggregates on one node.

The current link to our best practices document for SMB for HyperV is at https://docs.netapp.com/us-en/ontap/pdfs/sidebar/SMB_configuration_for_Microsoft_Hyper_V_and_SQL_Server.pdf

As your system is seeing indirect access, I assume that the volumes and aggregates are spread. With at least 10Gb throughput, on 9.9.1 indirect access should not be a major concern.

I can't say for sure why node referrals is required to be disabled for Hyper-V, but I suspect it is a requirement for continuous availability, as this would otherwise remove indirect access. I believe therefore that the indirect access is expected in this use case.

You can run this command to view latency sources in your environment - I would be interested to see the output:

cluster1::> qos statistics volume latency show -iterations 100
Workload        ID      Latency  Network  Cluster   Data     Disk     QoS       NVRAM      Cloud
--------------- ------ -------- -------- -------- -------- -------- -------- ---------- ----------
-total-                  110.35ms   0ms   110.02ms 327.00us   0ms    0ms     0ms         0ms
vs1vol0         111      167.82ms   0ms   167.22ms 603.00us   0ms    0ms     0ms         0ms
vol1            1234     117.76ms   0ms   117.56ms 191.00us   0ms    0ms     0ms         0ms

Re: Hyper-v over SMB

edununes — Wed, 15 Jun 2022 17:16:54 GMT

Alex, Thanks for responding.
Just remembering that my equipment is an A700 and before the update to 9.9.1 the latency was below 1ms,

Re: Hyper-v over SMB

AlexDawson — Tue, 21 Jun 2022 03:19:50 GMT

Hi there! This certainly sounds like it needs a support case opened, sorry!

Re: Hyper-v over SMB

Mikkar — Wed, 07 Jun 2023 07:01:26 GMT

Having same issue, did you solve this?