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𝗚𝗹𝗶𝗺𝗽𝘀𝗲 - 𝗔𝘇𝘂𝗿𝗲 𝗱𝗶𝘀𝗸 𝘂𝘀𝗲 𝗰𝗮𝘀𝗲𝘀

Hi Present days, Container based services/applications are growing than applications running from virtual machines.

Even though container services evolving IT apps landscape, we could not boycott VM usage. Azure VM also requires and plays vital role for some scenarios.

In this post, we are going to see just glimpse of azure disks of VM. This post is not about standard vs premium disk use case FYI.

Azure VM can run with OS disk but it is not good practice.

There are three types of disks.

  1. OS disk
  2. Data disk
  3. Ephemeral disk
We need to know when to use what then only we can avoid performance bottleneck.
𝗗𝗮𝘁𝗮 𝗗𝗶𝘀𝗸 - If we install applications as well in OS disk, we could face performance issue. It is best to use OS disk to have OS infos and booting.
The benefilt of Data disk is
  1. Easy maintanence
  2. Backup and disaster recovery
  3. Performance isolation (as it is far from OS activities) etc.,
𝗘𝗽𝗵𝗲𝗺𝗲𝗿𝗮𝗹 𝗗𝗶𝘀𝗸 - As we have above 2 disks, why and where can we use this disk?
ⓐ It is temporary disk.
ⓑ Good performance with no extra cost.
ⓒ You can create a VM by using ephemeral OS disks free of cost for storage as well as it is stored in local storage not in Azure storage but it suits for stateless workloads. Data can be lost any time.
ⓓ Useful to have page or swap files, tempdb files

𝗘𝗽𝗵𝗲𝗺𝗲𝗿𝗮𝗹 𝗗𝗶𝘀𝗸 𝗡𝗼𝘁𝗲𝘀 ① It is not managed disk.
② It is restricted to use OS and temp disk.
③ It is not being permanent and limited capacity. When VM reboot or other lifecycle event occurs, it can be deleted.

Please add your valuable additional comments, if I missed any. Your comments are welcome.

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