6.7

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Verify that the virtual machine compatibility is ESXi 4.x and later.
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Verify that VMware Tools is installed.
Procedure
1 Right-click a virtual machine in the inventory and select Edit Settings.
2 On the Virtual Hardware tab, expand Memory, and select Enable to enable adding memory to the
virtual machine while it is turned on.
3 Click OK.
Managing Persistent Memory
ESXi 6.7 provides support for the latest computer memory technology, which is called non-volatile
memory (NVM) or persistent memory (PMem). PMem combines the high data transfer rate of volatile
computer memory with the persistence and resiliency of traditional storage. PMem devices have low
access latency and can retain stored data through reboots or power outages.
Modes of Consumption of the Persistent Memory Resources of the Host
When you add a physical PMem device to a host, ESXi detects the PMem resource and exposes it as a
host-local PMem datastore to the virtual machines that run on the host. Depending on the guest OS,
virtual machines can have direct access to the PMem resources or access and consume them through a
regular SCSI device.
Each host can have only one local PMem datastore that pools and represents all PMem resources of the
host.
Persistent memory combines the properties of both memory and storage. So, virtual machines can
consume the PMem resources of the ESXi host as memory (through virtual NVDIMM devices) or as
storage (through virtual PMem hard disks).
The host-local PMem datastore stores all direct-accessed NVDIMM devices and virtual PMem hard disks.
Virtual PMem (vPMem)
In this mode, if the guest operating system is PMem-aware, the virtual machine can have direct access to
the physical PMem resources of the host and use them as standard, byte-addressable memory.
Virtual machines use virtual non-volatile dual in-line memory modules (NVDIMMs) for direct access to
PMem. The NVDIMM is a memory device that sits on an ordinary memory channel, but contains non-
volatile memory. In vSphere 6.7, the virtual NVDIMM is a new type of device that represents the physical
PMem regions of the host. A single virtual machine can have up to 64 virtual NVDIMM devices. Each
NVDIMM device is stored on the host-local PMem datastore.
Note To add an NVDIMM device to a virtual machine, the virtual machine must be of hardware version
14 and the guest OS must support persistent memory. If the guest OS is not PMem-aware, you can still
use PMem, but you cannot add an NVDIMM device to the virtual machine.
vSphere Virtual Machine Administration
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