If you’ve paid any attention to the IT blogs, news magazines, and tech journals, you’ve likely noticed the trend toward everything being ‘software defined’. You’ve probably heard of software-defined data centers, software-defined networking, and more. Software-defined storage marks a revolutionary new way of building and managing storage — one which costs less, yet is more agile, more reliable, and better supports multi-tenancy. So, what are the differences between software-defined storage and traditional SAN and NAS?