Users Guide

Linux

Topics:

• Identify and configure persistent memory device

•

Management utility

• Linux errata

Identify and configure persistent memory device

Listing DCPMM devices

To list all physical devices in the system, run command

ndctl list -DHi

Create namespace

The configuration of namespaces will decide how much memory capacity user wants to expose to the OS.

To configure namespace, run the following command:

ndctl create-namespace

Following command needs to be executed for each region created when the goals were created for the system:

ndctl create-namespace -r regionX

After creating name spaces, all name spaces are shown using the following command:

ndctl list -N

To correlate a namespace to a pmem device, use the following command:

lsblk

NOTE:

Ensure you delete all the namespaces before repurposing the DCPMMs. Repurposing includes DCPMM migration,

removal and reconfiguration between memory and App-direct mode

Mount file system on namespace device

After you see the PMEM devices in /device folder, mount the filesystems by using the following commands:

mkfs.xfs -f /dev/pmemX

(X is a natural number ranging from 0 to number of Logical PMEM Devices)

mkdir /mnt/pmemX

mount -o dax /dev/pmemX /mnt/pmemX

Linux 39