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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- The following 2.5-inch drives are now withdrawn from marketing: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- The following 3.5-inch drives are now withdrawn from marketing: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.
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.
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.
Server support
The following tables list the ThinkSystem servers that are compatible.
Operating system support
SAS and SATA 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 product guide for more information:
- RAID controllers: https://lenovopress.com/servers/options/raid
- SAS HBAs: https://lenovopress.com/servers/options/hba
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 publications and links
For more information, see the following documents:
- Lenovo Press product guides and papers on RAID adapters and HBAs
https://lenovopress.com/servers/options/raid - Lenovo RAID Management Tools and Resources
https://lenovopress.com/lp0579-lenovo-raid-management-tools-and-resources - Lenovo RAID Introduction
https://lenovopress.com/lp0578-lenovo-raid-introduction - Samsung Enterprise SSDs home page
https://www.samsung.com/semiconductor/ssd/enterprise-ssd/
Trademarks
Lenovo and the Lenovo logo are trademarks or registered trademarks of Lenovo in the United States, other countries, or both. A current list of Lenovo trademarks is available on the Web at https://www.lenovo.com/us/en/legal/copytrade/.
The following terms are trademarks of Lenovo in the United States, other countries, or both:
Lenovo®
ThinkSystem®
The following terms are trademarks of other companies:
AMD is a trademark of Advanced Micro Devices, Inc.
Intel® is a trademark of Intel Corporation or its subsidiaries.
Other company, product, or service names may be trademarks or service marks of others.
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Full 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
Changes in the February 9, 2021 update:
- The server support tables are now automatically updated - Server support section
Changes in the December 8, 2020 update:
- The 6.4TB drives (2.5-inch and 3.5-inch form factors) are now supported by additional servers - Server support section
Changes in the October 13, 2020 update:
- Added the SR850 V2 and SR860 V2 servers - Server support section
Changes in the May 15, 2020 update:
- Added 6.4TB drive options
- ThinkSystem 2.5" PM1645a 6.4TB Mainstream SAS 12Gb Hot Swap SSD, 4XB7A17065
- ThinkSystem 3.5" PM1645a 6.4TB Mainstream SAS 12Gb Hot Swap SSD, 4XB7A17068
Changes in the May 5, 2020 update:
- Added SR645 and SR665 to the server support table - Server support section
Changes in the January 7, 2020 update:
- Added SR850P to the server support table (no support) - Server support section
First published: 13 December 2019
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