Growing number of "Microsoft Hyper-V Network Adapters"
A VM is shut down and deallocated, a new network adapter will be used after it starts next time and the old network adapter is kept hidden.
When network adapter count is over 145, customer may face some network issue.
I understand it is by design and we should delete hidden network adapter to resolve this issue.
However, when we deallocate and start VM because we need to reduce costs using Autoscale or automation or other, this behavior is very big problem.
I want to improve this behavior.
Thomas Vuylsteke commented
This should be fixed as a side effect of this item: https://feedback.azure.com/forums/216843-virtual-machines/suggestions/5217933-static-mac-address
When will this be fixed?
Denise Child commented
The additional network adapters slow down transfers during azcopy.
Confirmed once the extra hidden nics were removed using the fixit (https://support.microsoft.com/en-us/kb/269155) the speed of the copy transfers increased.
Andrew Lowe commented
All sorts of network problems being caused by this for us too
For the love of Azure - please address this pronto!
That's a big bug on Azure IaaS, i got several problems on my servers, GPO not being aplicated due network problems. I got about 150 Hidden Network cards