DirectPV is a CSI driver for Direct Attached Storage. At the most basic level, it is a distributed persistent volume manager, and not a storage system like SAN or NAS. DirectPV is used to discover, format, mount, schedule and monitor drives across servers. Before we get into the architecture of DirectPV, let’s address why we needed to build it.

I was recently working with a customer on a performance optimization issue when I became aware of an NMVe phenomena which I had never come across, despite spending decades as a chief technology officer and chief data officer. As I dug into the phenomena, I learned that it is a bit of a shared secret among the NVMe crowd. The