check my source Just a quick article here on Disk Caching. It’s quite a common question I receive as to what is the benefit and what is it? Well in a nutshell cache settings make quite a considerable improvement when read-write operations with large amount of data are done to a disk. However, if lot of random I/O operations are done, turning the cache off is the preferred option as operations on cache incur charges on the basis of number of transactions. Random operations will not really make any significant improvement in performance. Be sure to check out my Azure Storage Explained article here.

original site You can configure caching when you create a new disk:

Hope this explains it and it makes more sense now.