Question: Azure Disk storage performance

Question

Hello everyone,

I have 2 problems:

1) I noticed that although I chose a premium ssd hard drive when creating the virtual machine, while I check the performance on the virtual machine it appears as an hdd, is this normal? (my virtual machine have windows 10 pro)

2) I have seen that when the disk works at maximum speed it reaches a maximum speed of about 70MB / s how can this be improved?

Answer 1

Hello @Max ,
w.r.t 1) - it is expected and by design as the Virtual Machine is a "Virtualized Environment" i.e. Hyper-v.
Basically , You’re seeing a virtual device using virtual disk file(VHD) hosted on your SSD and that VHD file is attached to your VM IDE/SCSI controller which presents as a virtualized HDD device

w.r.t 2) Disk speeds depends on the type of disk like Standard SSD , Premium SSD , etc.
https://learn.microsoft.com/en-us/azure/virtual-machines/disks-types

Disk type comparison
https://learn.microsoft.com/en-us/azure/virtual-machines/disks-types#disk-type-comparison
The following table provides a comparison of the four disk types to help you decide which to use.

Answer 2

You can change the Disk Size + Performance from the Azure Portal, Please see the below screen shots:

You can choose the required MBPS (default is 100 MBPS)

Answer 3

Hello @shiva patpi ,

Thank you very much!

I had thought something similar for point 1 but wasn't sure. Thanks for the clarifications.

For the second point, I am already using a premium SSD. As I mentioned I recorded a speed of about 70MB/s with some exceptions of 100MB/s but no more. Is there any way to speed this up even further?

Thanks again for your time