Deployment Guide

Configuring Azure Stack HCI persistent memory

hosts

Three types of device objects are related to persistent memory on Windows Server 2019: the NVDIMM root device, physical INVDIMMs,

and logical persistent memory disks. In Device Manager, physical INVDIMMs are displayed under Memory devices, while logical persistent

disks are under Persistent memory disks. The NVDIMM root device is under System Devices. The NVDIMM root device is controlled

by the scmbus.sys driver.

All NVDIMM devices are controlled by the nvdimm.sys driver, while the logical disks are controlled by the pmem.sys driver. Both the

nvdimm.sys and pmem.sys drivers are the same for all types of persistent memory, such as NVDIMM-N and Intel Optane DC Persistent

Memory (INVDIMM).

The following figure shows the Device Manager on a system with 12 INVDIMMs across dual CPU sockets and two persistent storage

disks:

Figure 5. Device Manager example

Persistent Memory for Azure Stack HCI