Special use system memory Subsystem

A virtual persistent memory (vPMEM) device is created when you assign the traditional memory such as dynamic random access memory (DRAM) to a logical partition (LPAR) as a vPMEM device. Contents of the vPMEM device are preserved when the LPAR is rebooted, provided the server is not rebooted, or the server is not powered off. Continuous power supply must be maintained for vPMEM devices. Power state of the vPMEM device is independent of the power state of the LPAR to which the vPMEM device is assigned. When power supply for a vPMEM device is lost, the data that is stored in the vPMEM device is lost. You must back up contents of the vPMEM device to another device such as a physical disk before the server is rebooted or before the server is powered off.

The software stack of the special use system memory subsystem consists of a single device driver that supports interfaces to both the special use system memory subsystem and the corresponding storage devices (hdisk).