Learning Microsoft Azure Storage

Host caching

I bet you noticed the Host caching option when adding and resizing Azure VM disks, and that is what we are going to cover in this topic.

As you know, the VM and its storage do not exist on the same server, so some latency occurs when a VM tries to access its storage that is stored on OS disks and data disks. Therefore, in order to reduce this latency, Microsoft came up with host caching, which caches access to the OS and data disks.

There are three types of host caching:

• Read-only
• Read/write
• None