I have an Azure subscription from MSDN Ultimate (running on the old pricing model). There, I run two VMs (West Europe). Both have their VHDs stored in the same storage account (also West Europe). It is geo-redundand by default (didn't change it).
The first VM has been running fine for some weeks without issues. But since a couple days ago when I started the second one, something weird happend.
On my billing details I do now get rows like this:
"All Services",...,"Data Transfer In (GB)",...,"Storage",..."mystorageaccountid"
"All Services",...,"Data Transfer Out (GB)",...,"Storage",..."mystorageaccountid"
Today it said 171 GB in and 31 GB out! Note that it attributes this to the storage account and NOT to the VM. Also VM dashboard shows basically no in/out values (which is correct).
I do not use CDN or any other Azure feature (at least I'm not aware of it). I do not acces the storage account in any other way than by the VM. The VM itself may be writing/reading from its VHD in a quantity that fits the above figures, though.
How can this happen / how can I prevent it?
My first guess is that maybe it's because I put the second VM's VHD on the same storage container. But on the other hand, it's all in the same region...
Thanks for your help!
David