Top 10 information which are required for a reasonable sizing estimate of the Azure VM

There are several information which are required to make a reasonable sizing estimate for Azure VMs, and here is a comprehensive list which we used to follow from long time to get the reasonable T-Shirt sizing of the Azure VM’s.

  1. CPU utilization
  2. Memory Utilization
  3. Disk Size
  4. Disk IOPs (I/O’s per second) for C: drive and data / database drives
  5. Disk data transfer rates (Mbytes per second) for C: drive and data / database drives
  6. Backup / restore requirements
  7. Availability / redundancy approach
  8. DR approach
  9. Any specific network requirements (For example DMZ, Load balancer)
  10. VM scheduling opportunities – I.E. when can it be powered off to save money.

Out of these many parameters the first five items are the most critical for sizing as over-provisioning in Azure can have major cost implications. The first five can be easily gathered by configuring Windows Performance Counter. The information of the next 5 can be gathered by the discussion with application owners. In my future posts I will show you how we can capture the information of the first five parameters from Windows Server OS based VM’s or Physical Servers.

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