Hi All,

This is a fast post about something I’m encountering when trying to understand the data disks performance in Azure virtual machines.

If you read the official TechNet article where the different Azure virtual machines series are exposed and their configuration detailed, maybe (like me) you will be confused about the data disks performances between the (A-Series, D-Series and G-Series) vs (DS-Series).

In the A-Series, D-Series and G-series  virtual machines, the data disks performances are described using the metric: Max IOPS

In the DS-Series virtual machines, the data disks performances are described using the metric: Max. disk IOPS and bandwidth

The questions that I was asking myself are:

1. What this IOPS means, how much data per IOPS ?
2. Why there is an additional bandwidth metric in the DS  Series ?

And here, I will answer based on information I got:

  What this IOPS means…