Azure VM SSD premium very slow performance

Question

Hi,
I must migrate from my actual provider to Azure VM.
I have 2 VM with the same problem, Windows Server 2022 Standard B2ms with a disk P10 SSD Premium. The max IO/s must be 500 and the velocity 100MB/s.
I have a file zip of 5 GB, I extract it in 4 minutes from my actual provider. With Azure VM 2 hours. The max I/O per seconds used is 24 and max velocity is 700Kbps. the CPU used is 50%.
Where is the problem?
The 2 VM are in:
West Europe (Zone 1)
West Europe (Zone 3)

Thank you

Giuseppe

Answer 1

Hi Giuseppe,

Maybe the problem is in the VM Size Type.

VM series B are shared on host with other clients and this can bring performance problems.

I recomend change the VM Size type to Dv3 or Dv4 (General Purpose) that is dedicated to you.

Answer 2

Hi @Giuseppe Melis ,

the IO performance of a disk depends on 2 factors:

1. on the performance of the disk -> P10 = 500 IOPS / 100 MB/sec
   (https://learn.microsoft.com/en-us/azure/virtual-machines/disks-types#premium-ssd-size)
2. on the performance of the VM -> B2ms = 1920 IOPS / 22.5 MBps
   (https://learn.microsoft.com/en-us/azure/virtual-machines/sizes-b-series-burstable)

You should check the performance indicators of the VM in the Azure Portal:
https://learn.microsoft.com/en-us/azure/virtual-machines/monitor-vm

Maybe you can identify the bottleneck of your performance issue this way.

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(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

Regards
Andreas Baumgarten

Answer 3

Hi @Andreas Baumgarten ,
I stopped real time protection antivirus, now in the monitor I see 100 I/Ops and 7,60 MBps.
When I use the zip extractor antivirus use a large quantity of resources. But monitor show me only the zip extractor resources used, not the antivirus resources used.
This is an acceptable value, but is always a low value , there is some bug in the monitor and not show all the real resources used.
But if I pay for 500 IOPS or 22.5 MBps and I see in the monitor 1/5 of the resources used I can think they are giving me less than I pay.
Where can I report a bug in the monitor resource calculate?

Thank you

Answer 4

Hi @Giuseppe Melis ,

did you check if the CPU is maybe a limiting component while extracting the large zip file?

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(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

Regards
Andreas Baumgarten