Lenovo PM1643a 25" 192 TB SAS V-NAND TLC

Abstract
The PM1643a Entry SAS 12Gb solid-state drives (SSDs) from Lenovo provide high-performance reliable storage solutions for high-capacity enterprise applications Designed for dense storage and with a 12 Gb SAS interface these drives feature all the capacity and performance that is needed to replace large numbers of 15K rpm and 10K rpm spinning disks and consolidate storage into tightly packed server configurations

This product guide provides essential presales information to understand the PM1643a Entry SAS 12Gb SSD offerings and their key features specifications and compatibility This guide is intended for technical specialists sales specialists sales engineers IT architects and other IT professionals who want to learn more about the SSDs and consider their use in IT solutions

Introduction
The ThinkSystem PM1643a Entry SAS 12Gb solid-state drives (SSDs) are next-generation SSDs suitable for a wide range of applications The PM1643a SAS SSDs are designed for dense storage and with a 12 Gb SAS interface these drives feature all the capacity and performance that is needed to replace large numbers of 15K rpm and 10K rpm spinning disks and consolidate storage into tightly packed server configurations

The PM1643a SSDs are the follow-on to the PM1643 SSDs and offer improved random write performance

Did you know
Unlike SATA drives the 12 Gb/s SAS interface on PM1643a drives supports full duplex data transfer for higher performance as well as enterprise-level error recovery for better availability

Rigorous testing of PM1643a Entry SATA SSDs by Lenovo through the ServerProven program assures a high degree of storage subsystem compatibility and reliability Providing additional peace of mind these drives are covered under Lenovo warranty

SSDs have a huge but finite number of program/erase (P/E) cycles which affect how long they can perform write operations and thus their life expectancy Entry SSDs typically have a better cost per read IOPS ratio but lower endurance and performance compared to Mainstream or Performance SSDs

SSD write endurance is typically measured by the number of program/erase (P/E) cycles that the drive incurs over its lifetime listed as the total bytes of written data (TBW) in the device specification The TBW value assigned to a solid-state device is the total bytes of written data (based on the number of P/E cycles) that a drive can be guaranteed to complete ( of remaining P/E cycles = of remaining TBW)

Reaching this limit does not cause the drive to immediately fail It simply denotes the maximum number of writes that can be guaranteed A solid-state device will not fail upon reaching the specified TBW At some point based on manufacturing variance margin after surpassing the TBW value the drive will reach the end-of-life point at which the drive will go into a read-only mode