Non-Volatile Memory Express (NVMe)
NVMe is a specification for storage access and a transport protocol for solid-state
drives (SSDs). NVMe allows thousands of parallel command queues that improve storage performance.
The NVMe protocol is standardized and is widely available from many SSD vendors.
NVMe drives Non-Volatile Memory Express (NVMe) drives are physical storage devices or solid-state drives (SSDs) that can be installed internally in system slots or externally in a NVMe expansion drawer like the NVMe expansion drawer - 24 devices (NED24).NVMe controllers Physical Non-Volatile Memory Express (NVMe) drives have two controllers. For internal input/output (I/O) slots, you can attach only the primary controller to the slot. For NVMe expansion drawer - 24 devices (NED24), you can attach both the controllers to the NVMe device.NVMe namespaces Non-Volatile Memory Express (NVMe) disks often have multiple controllers. All Power Systems connect only one of the controllers to the Peripheral Component Interconnect Express (PCIe) slot. The secondary controller is not visible as a PCI device and is not a part of the NVMe topology of Linux®. However, when a NVMe drive is placed in a NVMe expansion drawer - 24 devices (NED24), both the controllers can be attached to the NVMe device.NVMe shared namespaces on multipath devices (FW 1060 and later) You can attach up to 24 Non-Volatile Memory Express (NVMe) drives to the NVMe expansion drawer - 24 devices (NED24). On firmware (FW) 1040 and 1050, there is one path to device slots 13-24 and a different path to device slots 1-12. On FW 1060.10 and later, there are two paths to each of the device slots 1-24.Hotplug of a multipath NVMe device (FW 1060 and later) Hot plug is the process of adding a component to the running operating system without interrupting the operations of the system. The Non-Volatile Memory Express (NVMe) devices contain unique Peripheral Component Interconnect (PCI) reset signals and logical power states. Only one logical device that is associated with a physical device needs to be powered on before you can power on the physical drive. However, both logical devices must be powered off before you can power off the physical drive.NVMe over Fibre Channel (NVMf-FC) Linux® on Power® supports attaching NVMf-FC LUNs in addition to SCSI-FC LUNs.