What is PMem storage?

What is PMem storage?

Persistent memory (PMEM) is a solid-state high-performance byte-addressable memory device that resides on the memory bus. Being on the memory bus allows PMEM to have DRAM-like access to data, which means that it has nearly the same speed and latency of DRAM and the nonvolatility of NAND flash.

What is 1LM and 2LM memory?

(One-level Memory) The term 1LM refers to how memory is usually connected to the system, without any memory-side cache. Normally, the terms DRAM or system main memory are used, but 1LM is sometimes used to specifically state that the memory in question is not configured as 2LM.

What is PMem in vmware?

Persistent Memory (PMem), also known as Non-Volatile Memory (NVM), is capable of maintaining data even after a power outage. PMem can be used by applications that are sensitive to downtime and require high performance. VMs can be configured to use PMem on a standalone host, or in a cluster.

What is DDR T interface?

Intel said that its DDR-T protocol supports asynchronous commands and timing that give the Optane DIMM more control than traditional CPU-managed modules. Similar to vanilla DDR, it supports access to 64-B cache lines. In their design, Optane DIMMs are like small, stripped-down, specialized SSDs. ( Source: Intel)

What is the difference between Optane and SSD?

While a solid-state drive (SSD) is a device used for data storage, Intel® Optane™ memory is a system acceleration solution installed between the processor and slower storage devices (SATA HDD, SSHD, SSD), which enables the computer to store commonly used data and programs closer to the processor.

Is DRAM same as RAM?

Dynamic random access memory (DRAM) is a type of semiconductor memory that is typically used for the data or program code needed by a computer processor to function. DRAM is a common type of random access memory (RAM) that is used in personal computers (PCs), workstations and servers.

Why is DDR PHY needed?

The DDR PHY IP is designed to connect seamlessly and work with third-party, DFI-compliant memory controllers. The DDR PHY IP is developed and validated to reduce risk for the customer so that their SoC will work right the first time.

Do you need Optane If you have SSD?

It is perfect for devices that need high storage capacity and decent loading speeds on a budget. It is something that is ideally designed to be paired up with HDDs. If you already have an SSD installed, then buying Optane doesn’t give you an edge over anything.

Which is better Optane memory or RAM?

Intel Optane memory allows faster work and fewer delays in the case of in-memory databases because of its non-volatile nature. RAM is expensive than Intel’s Optane memory. Optane memory can store more data than RAM as the capacity comes in 16GB and 32GB whereas RAM capacity is available from 1GB to 8GB.

What is PHY in PCIE?

2.1 PCI Express PHY Layer The PCI Express PHY Layer handles the low level PCI Express protocol and signaling. This includes features such as; data serialization and deserialization, 8b/10b encoding, 128b/130b encoding (8 GT/s), analog buffers, elastic buffers and receiver detection.

How do I create a namespace in PMEM?

Use ndctl to create a namespace. Namespaces are interleaved across PMEM NVDIMMs and can provide different types of user-space access to memory regions on the device. fsdax is default and desired mode for SQL Server. We have chosen fsdax mode and are using system memory to store per-page metadata.

What are namespaces in PMEM NVDIMMs?

Namespaces are interleaved across PMEM NVDIMMs and can provide different types of user-space access to memory regions on the device. fsdax is default and desired mode for SQL Server. We have chosen fsdax mode and are using system memory to store per-page metadata.

What is PMEM mode in VMware?

In this mode, the PMem capacity is presented as byte addressable persistent storage to the OS. In the case of vSphere, VMs contained within a host that has PMem modules installed in this mode will allow guests to consume persistent memory.

What is the difference between vpmem and vpmemdisk?

For VMs within vSphere to use virtual PMem devices, PMem must be exposed in App Direct mode. vPmem and vPMemDisk are virtual devices that are allocated from the App Direct PMem available on the host. PMem can be added as vPMem by adding a vNVDIMM device during VM creation or editing.