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ThinkSystem PM1645a Mainstream 12Gb SAS SSDs

Product Guide

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5 Jun 2023
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LP1258
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Abstract

The ThinkSystem PM1645a Mainstream SAS 12Gb solid-state drives (SSDs) in capacities of up to 6.4 TB are next-generation high-performance SSDs suitable for a wide range of applications of running on ThinkSystem servers.

This product guide provides essential presales information to understand the Mainstream 12Gb SAS 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.

Change History

Changes in the June 5, 2023 update:

  • The following 2.5-inch drives are now withdrawn from marketing:
    • ThinkSystem 2.5" PM1645a 1.6TB Mainstream SAS 12Gb Hot Swap SSD, 4XB7A17063
    • ThinkSystem 2.5" PM1645a 6.4TB Mainstream SAS 12Gb Hot Swap SSD, 4XB7A17065
  • The following 3.5-inch drives are now withdrawn from marketing:
    • ThinkSystem 3.5" PM1645a 1.6TB Mainstream SAS 12Gb Hot Swap SSD, 4XB7A17043
    • ThinkSystem 3.5" PM1645a 3.2TB Mainstream SAS 12Gb Hot Swap SSD, 4XB7A17067
    • ThinkSystem 3.5" PM1645a 6.4TB Mainstream SAS 12Gb Hot Swap SSD, 4XB7A17068

Introduction

The ThinkSystem PM1645a Mainstream SAS 12Gb solid-state drives (SSDs) in capacities of up to 6.4 TB are next-generation high-performance SSDs suitable for a wide range of applications of running on ThinkSystem servers.

The PM1645a SSDs are the follow-on to the PM1645 SSDs and offer improved random write performance.

ThinkSystem PM1645a Mainstream SAS 12Gb SSD
Figure 1. ThinkSystem PM1645a Mainstream SAS 12Gb SSD

Did you know?

Unlike SATA drives, the 12 Gb/s SAS interface on these drives supports full duplex data transfer for higher performance, and enterprise-level error recovery for better availability. By combining the enhanced reliability of Samsung NAND flash memory silicon with NAND Flash management technologies, PM1645a SSDs deliver the extended endurance of up to 3 drive writes per day (DWPD) for 5 years, which is suitable for many enterprise applications.

Part number information

The following tables list the information for ordering part numbers and feature codes.

Table 1. Ordering part numbers and feature codes
Part number Feature code Description
2.5-inch hot-swap drives
4XB7A17062 B8HU ThinkSystem 2.5" PM1645a 800GB Mainstream SAS 12Gb Hot Swap SSD
4XB7A17063 B8J4 ThinkSystem 2.5" PM1645a 1.6TB Mainstream SAS 12Gb Hot Swap SSD
4XB7A17064 B8JD ThinkSystem 2.5" PM1645a 3.2TB Mainstream SAS 12Gb Hot Swap SSD
4XB7A17065 B8JA ThinkSystem 2.5" PM1645a 6.4TB Mainstream SAS 12Gb Hot Swap SSD
3.5-inch hot-swap drives
4XB7A17066 B8HT ThinkSystem 3.5" PM1645a 800GB Mainstream SAS 12Gb Hot Swap SSD
4XB7A17043 B8JN ThinkSystem 3.5" PM1645a 1.6TB Mainstream SAS 12Gb Hot Swap SSD
4XB7A17067 B8JK ThinkSystem 3.5" PM1645a 3.2TB Mainstream SAS 12Gb Hot Swap SSD
4XB7A17068 B8JG ThinkSystem 3.5" PM1645a 6.4TB Mainstream SAS 12Gb Hot Swap SSD

The part numbers include the following items:

  • One solid-state drive with a hot-swap tray
  • Documentation flyer

Features

The PM1645a Mainstream SAS 12Gb SSDs have the following features:

  • Mainstream server SSD suitable for mixed read-write-intensive workloads
  • Endurance of 3 drive-writes per day (DWPD)
  • 2.5-inch or 3.5-inch industry standard form factor with hot-swap tray
  • SAS 12 Gbps interface
  • Protect data integrity from unexpected power loss with Samsung's advanced power-loss protection architecture
  • Supports Self-Monitoring, Analysis and Reporting Technology (S.M.A.R.T)
  • End-to-end data protection
  • Support 16 Initiator with Tag Command Queuing (TCQ) Command Set with a queue-depth of up to 128 commands
  • Compliant with SCSI Specification (SAS-3 / SPL-3 / SBC-4 / SPC-4 / SAM-5)
  • RoHS Compliant

Entry SSDs and Mainstream SSDs have similar read and write IOPS performance, but the key difference between them is their endurance (or lifetime) (that is, how long they can perform write operations because SSDs have a finite number of program/erase (P/E) cycles). Mainstream SSDs have better endurance but lower cost/IOPS ratio compared to Entry 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.

Comparing PM1643a and PM1645a drives from Lenovo: Samsung has authorized Lenovo to offer both PM1643a and PM1645a SSDs. These two product families use common drive hardware but use custom Lenovo firmware to set the level of endurance – 1 DWPD (drive write per day) for the PM1643a drives and 3 DWPD for the PM1645a drives. The PM1645a drives are part of the Samsung design specification but are only available with Lenovo firmware. PM1645a drives are not available from Samsung with generic firmware.

Technical specifications

The following tables present technical specifications for the PM1645a Mainstream SAS 12Gb SSDs.

Table 2. Technical specifications
Feature 800 GB drive 1.6 TB drive 3.2 TB drive 6.4 TB drive
Interface 12 Gbps SAS 12 Gbps SAS 12 Gbps SAS 12 Gbps SAS
Capacity 800 GB 1.6 TB 3.2 TB 6.4 TB
SED encryption None None None None
Endurance
(drive writes per day for 5 years)		 3 DWPD 3 DWPD 3 DWPD 3 DWPD
Endurance
(total bytes written)		 4,380 TB 8,760 TB 17,520 TB 35,040 TB
Data reliability
(UBER)		 < 1 in 1017 bits read < 1 in 1017 bits read < 1 in 1017 bits read < 1 in 1017 bits read
MTBF 2,000,000 hours 2,000,000 hours 2,000,000 hours 2,000,000 hours
IOPS reads (4 KB blocks) 230,000 230,000 230,000 230,000
IOPS writes (4 KB blocks) 90,000 130,000 140,000 140,000
Sequential read rate
(128 KB blocks)		 1000 MBps 1000 MBps 1000 MBps 1000 MBps
Sequential write rate
(128 KB blocks)		 1000 MBps 1000 MBps 1000 MBps 1000 MBps
Read latency (ran) 120 µs 120 µs 120 µs 130 µs
Write latency (ran) 45 µs 45 µs 45 µs 45 µs
Shock, non-operating 1,500 G (Max) at 0.5 ms 1,500 G (Max) at 0.5 ms 1,500 G (Max) at 0.5 ms 1,500 G (Max) at 0.5 ms
Vibration, non-operating 20 GRMS (10-2000 Hz) 20 GRMS (10-2000 Hz) 20 GRMS (10-2000 Hz) 20 GRMS (10-2000 Hz)
Typical power (R / W) 9 W / 9 W 9 W / 9 W 9 W / 9 W 9 W / 9 W

Server support

The following tables list the ThinkSystem servers that are compatible.

Table 3. Server support (Part 1 of 4)
Part Number Description 2S AMD V3 2S Intel V3 4S 8S Intel V3 Multi Node GPU Rich 1S V3
SR635 V3 (7D9H / 7D9G)
SR655 V3 (7D9F / 7D9E)
SR645 V3 (7D9D / 7D9C)
SR665 V3 (7D9B / 7D9A)
ST650 V3 (7D7B / 7D7A)
SR630 V3 (7D72 / 7D73)
SR650 V3 (7D75 / 7D76)
SR850 V3 (7D97 / 7D96)
SR860 V3 (7D94 / 7D93)
SR950 V3 (7DC5 / 7DC4)
SD535 V3 (7DD8 / 7DD1)
SD530 V3 (7DDA / 7DD3)
SD550 V3 (7DD9 / 7DD2)
SR670 V2 (7Z22 / 7Z23)
SR675 V3 (7D9Q / 7D9R)
SR680a V3 (7DHE)
SR685a V3 (7DHC)
ST250 V3 (7DCF / 7DCE)
SR250 V3 (7DCM / 7DCL)
2.5-inch hot-swap drives
4XB7A17062 ThinkSystem 2.5" PM1645a 800GB Mainstream SAS 12Gb Hot Swap SSD N N N N N N N N N N N N N Y N N N N N
4XB7A17063 ThinkSystem 2.5" PM1645a 1.6TB Mainstream SAS 12Gb Hot Swap SSD N N N N N N N N N N N N N Y N N N N N
4XB7A17064 ThinkSystem 2.5" PM1645a 3.2TB Mainstream SAS 12Gb Hot Swap SSD N N N N N N N N N N N N N N N N N N N
4XB7A17065 ThinkSystem 2.5" PM1645a 6.4TB Mainstream SAS 12Gb Hot Swap SSD N N N N N N N N N N N N N Y N N N N N
3.5-inch hot-swap drives
4XB7A17066 ThinkSystem 3.5" PM1645a 800GB Mainstream SAS 12Gb Hot Swap SSD N N N N N N N N N N N N N N N N N N N
4XB7A17043 ThinkSystem 3.5" PM1645a 1.6TB Mainstream SAS 12Gb Hot Swap SSD N N N N N N N N N N N N N N N N N N N
4XB7A17067 ThinkSystem 3.5" PM1645a 3.2TB Mainstream SAS 12Gb Hot Swap SSD N N N N N N N N N N N N N N N N N N N
4XB7A17068 ThinkSystem 3.5" PM1645a 6.4TB Mainstream SAS 12Gb Hot Swap SSD N N N N N N N N N N N N N N N N N N N
Table 4. Server support (Part 2 of 4)
Part Number Description Edge Super Computing 1S Intel V2 2S Intel V2
SE350 (7Z46 / 7D1X)
SE350 V2 (7DA9)
SE360 V2 (7DAM)
SE450 (7D8T)
SE455 V3 (7DBY)
SD665 V3 (7D9P)
SD665-N V3 (7DAZ)
SD650 V3 (7D7M)
SD650-I V3 (7D7L)
SD650-N V3 (7D7N)
ST50 V2 (7D8K / 7D8J)
ST250 V2 (7D8G / 7D8F)
SR250 V2 (7D7R / 7D7Q)
ST650 V2 (7Z75 / 7Z74)
SR630 V2 (7Z70 / 7Z71)
SR650 V2 (7Z72 / 7Z73)
2.5-inch hot-swap drives
4XB7A17062 ThinkSystem 2.5" PM1645a 800GB Mainstream SAS 12Gb Hot Swap SSD N N N N N N N N N N N N N Y Y Y
4XB7A17063 ThinkSystem 2.5" PM1645a 1.6TB Mainstream SAS 12Gb Hot Swap SSD N N N N N N N N N N N N N Y Y Y
4XB7A17064 ThinkSystem 2.5" PM1645a 3.2TB Mainstream SAS 12Gb Hot Swap SSD N N N N N N N N N N N N N N N N
4XB7A17065 ThinkSystem 2.5" PM1645a 6.4TB Mainstream SAS 12Gb Hot Swap SSD N N N N N N N N N N N N N Y Y Y
3.5-inch hot-swap drives
4XB7A17066 ThinkSystem 3.5" PM1645a 800GB Mainstream SAS 12Gb Hot Swap SSD N N N N N N N N N N N N N Y Y Y
4XB7A17043 ThinkSystem 3.5" PM1645a 1.6TB Mainstream SAS 12Gb Hot Swap SSD N N N N N N N N N N N N N Y Y Y
4XB7A17067 ThinkSystem 3.5" PM1645a 3.2TB Mainstream SAS 12Gb Hot Swap SSD N N N N N N N N N N N N N Y Y Y
4XB7A17068 ThinkSystem 3.5" PM1645a 6.4TB Mainstream SAS 12Gb Hot Swap SSD N N N N N N N N N N N N N Y Y Y
Table 5. Server support (Part 3 of 4)
Part Number Description AMD V1 Dense V2 4S V2 8S 4S V1 1S Intel V1
SR635 (7Y98 / 7Y99)
SR655 (7Y00 / 7Z01)
SR655 Client OS
SR645 (7D2Y / 7D2X)
SR665 (7D2W / 7D2V)
SD630 V2 (7D1K)
SD650 V2 (7D1M)
SD650-N V2 (7D1N)
SN550 V2 (7Z69)
SR850 V2 (7D31 / 7D32)
SR860 V2 (7Z59 / 7Z60)
SR950 (7X11 / 7X12)
SR850 (7X18 / 7X19)
SR850P (7D2F / 2D2G)
SR860 (7X69 / 7X70)
ST50 (7Y48 / 7Y50)
ST250 (7Y45 / 7Y46)
SR150 (7Y54)
SR250 (7Y52 / 7Y51)
2.5-inch hot-swap drives
4XB7A17062 ThinkSystem 2.5" PM1645a 800GB Mainstream SAS 12Gb Hot Swap SSD Y Y N Y Y N N N Y Y Y Y Y Y Y N N N N
4XB7A17063 ThinkSystem 2.5" PM1645a 1.6TB Mainstream SAS 12Gb Hot Swap SSD Y Y N Y Y N N N N Y Y Y Y Y Y N N N N
4XB7A17064 ThinkSystem 2.5" PM1645a 3.2TB Mainstream SAS 12Gb Hot Swap SSD N N N N N N N N N N N N N N N N N N N
4XB7A17065 ThinkSystem 2.5" PM1645a 6.4TB Mainstream SAS 12Gb Hot Swap SSD Y Y N Y Y N N N N Y Y Y Y Y Y N N N N
3.5-inch hot-swap drives
4XB7A17066 ThinkSystem 3.5" PM1645a 800GB Mainstream SAS 12Gb Hot Swap SSD Y Y N Y Y N N N N N N N N N N N N N N
4XB7A17043 ThinkSystem 3.5" PM1645a 1.6TB Mainstream SAS 12Gb Hot Swap SSD Y Y N Y Y N N N N N N N N N N N N N N
4XB7A17067 ThinkSystem 3.5" PM1645a 3.2TB Mainstream SAS 12Gb Hot Swap SSD Y Y N Y Y N N N N N N N N N N N N N N
4XB7A17068 ThinkSystem 3.5" PM1645a 6.4TB Mainstream SAS 12Gb Hot Swap SSD Y Y N Y Y N N N N N N N N N N N N N N
Table 6. Server support (Part 4 of 4)
Part Number Description 2S Intel V1 Dense V1
ST550 (7X09 / 7X10)
SR530 (7X07 / 7X08)
SR550 (7X03 / 7X04)
SR570 (7Y02 / 7Y03)
SR590 (7X98 / 7X99)
SR630 (7X01 / 7X02)
SR650 (7X05 / 7X06)
SR670 (7Y36 / 7Y37)
SD530 (7X21)
SD650 (7X58)
SN550 (7X16)
SN850 (7X15)
2.5-inch hot-swap drives
4XB7A17062 ThinkSystem 2.5" PM1645a 800GB Mainstream SAS 12Gb Hot Swap SSD Y Y Y Y Y Y Y Y Y N Y Y
4XB7A17063 ThinkSystem 2.5" PM1645a 1.6TB Mainstream SAS 12Gb Hot Swap SSD Y Y Y Y Y Y Y Y Y N Y Y
4XB7A17064 ThinkSystem 2.5" PM1645a 3.2TB Mainstream SAS 12Gb Hot Swap SSD N N N N N N N Y N N N N
4XB7A17065 ThinkSystem 2.5" PM1645a 6.4TB Mainstream SAS 12Gb Hot Swap SSD Y Y Y Y Y Y Y Y Y N Y Y
3.5-inch hot-swap drives
4XB7A17066 ThinkSystem 3.5" PM1645a 800GB Mainstream SAS 12Gb Hot Swap SSD Y Y Y Y Y Y Y N N N N N
4XB7A17043 ThinkSystem 3.5" PM1645a 1.6TB Mainstream SAS 12Gb Hot Swap SSD Y Y Y Y Y Y Y N N N N N
4XB7A17067 ThinkSystem 3.5" PM1645a 3.2TB Mainstream SAS 12Gb Hot Swap SSD Y Y Y Y Y Y Y N N N N N
4XB7A17068 ThinkSystem 3.5" PM1645a 6.4TB Mainstream SAS 12Gb Hot Swap SSD Y Y Y Y Y Y Y N N N N N

Operating system support

SAS SSDs operate transparently to users, storage systems, applications, databases, and operating systems.

Operating system support is based on the controller used to connect to the drives. Consult the controller propduct guide for more information:

Warranty

The PM1645a Mainstream SAS 12Gb SSDs carry a one-year, customer-replaceable unit (CRU) limited warranty. When the SSDs are installed in a supported server, these drives assume the system’s base warranty and any warranty upgrades.

Solid State Memory cells have an intrinsic, finite number of program/erase cycles that each cell can incur. As a result, each solid state device has a maximum amount of program/erase cycles to which it can be subjected. The warranty for Lenovo solid state drives (SSDs) is limited to drives that have not reached the maximum guaranteed number of program/erase cycles, as documented in the Official Published Specifications for the SSD product. A drive that reaches this limit may fail to operate according to its Specifications.

Physical specifications

PM1645a Mainstream SAS 12Gb SSDs have the following physical specifications:

Dimensions and weight (approximate, without the hot-swap tray, if applicable):

  • Height: 15 mm (0.6 in.)
  • Width: 70 mm (2.8 in.)
  • Depth: 100 mm (4.0 in.)
  • Weight: 140 g (4.9 oz)

Shipping dimensions and weight for the 2.5-inch drives (approximate):

  • Height: 63 mm (2.5 in.)
  • Width: 133 mm (5.2 in.)
  • Depth: 174 mm (6.9 in.)

Shipping dimensions and weight for the 3.5-inch drives (approximate):

  • Height: 95 mm (3.7 in.)
  • Width: 194 mm (7.6 in.)
  • Depth: 257 mm (10.0 in.)

Operating environment

PM1645a Mainstream SAS 12Gb SSDs are supported in the following environment:

  • Temperature, operating: 0 - 70 °C (32 - 158 °F)
  • Temperature, non-operating: -40 to 85 °C (-40 - 185 °F)
  • Relative humidity: 5 - 95% (noncondensing)
  • Maximum altitude: -300 - 4,572 m (-1,000 to 15,000 feet)

Agency approvals

PM1645a Mainstream SAS 12Gb SSDs conform to the following regulations:

  • UL
  • TUV
  • FCC
  • IC
  • CB
  • CE Mark
  • C-Tick Mark
  • BSMI (Taiwan)
  • KCC (Korea EMI)
  • VCCI

Related product families

Product families related to this document are the following:

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The following terms are trademarks of Lenovo in the United States, other countries, or both:
Lenovo®
ThinkSystem®

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Other company, product, or service names may be trademarks or service marks of others.

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