Azure Disk Types

Just like any computer, the Azure virtual machines also the disks to store the operating system and data files. And these disks will get saved in the form of .VHD files and stored in the Azure blob storage.

Azure disks are of three types:

  • Operating System Disks – Persistent disks
  • Temporary Disks – Non-Persistent disks
  • Data Disks – Persistent disks

Important Notes:

  • All the Virtual machines by default contains the OS disk and Temporary disk.

Operating System Disks:

  • This is Persistent disk, where the data written will not affect even after reboots, start, stop or other lifecycle events.
  • Disk contains operating system and system files.
  • It is registered as a SATA drive and the image will get stored in the Azure blob storage as .VHD files.
  • The maximum capacity of the disk is 1024 GB.
  • The capacity varies by choosing the virtual machine size.

Temporary Disks:

  • These are non-persistent disks, where the data will get clear after any events like resizing a virtual machine or updating the host or hardware failures.
  • Temporary disks will get stored on the host operating system running the hypervisor software.
  • Microsoft recommends not to save any data in this disk, which is relevant to the application.

 

Data Disks:

  • This is Persistent disk, where the data written will not affect even after reboots, start, stop or other lifecycle events.
  • These are additional disks attached to the virtual machine to store application data.
  • Data disks are registered as SCSI drives and stores in the Azure blob storage as .VHD files.
  • Each data disk has a maximum capacity of 1024 GB
  • The Data disks are of two types: HDD and SSD disks.
    • HDD disks are used for standard I/O performance.
    • SSD disks are used for high I/O performance.
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