Samsung MZ-QL21T900 1.92 TB PM9A3 PCIe Gen4 x4, NVMe 1.4 2.5 inch Enterprise / Data Center Read Intensive Solid State Drive

General

Brand	Samsung
Model	PM9A3
Capacity	1.92 TB
Usage Class	Enterprise / Data Center Read Intensive

Interface

Host Interface	PCIe Gen4 x4, NVMe 1.4
Total Interface Bandwidth	64 Gb/s

Physical Dimension

Form Factor	2.5

Flash & Endurance

NAND Flash	Samsung V6 (128-layer) TLC
Drive Writes Per Day	1
Total Bytes Written	3504 TBW

Performance

Sequential Read	6800 MB/s
Sequential Write	4000 MB/s
Random Read IOPS	1000000
Random Write IOPS	180000
Average Latency	80 μs

Reliability

Mean Time Between Failures	2 Million Hours
Uncorrectable Bit Error Rate	1.0×10⁻¹⁷
Power Loss Protection	Yes

Part Number

MPN	MZ-QLB1T90

Engineer's Note

Compared with the previous-generation MZ-QLB1T90, the MZ-QL21T900 PM9A3 advances to PCIe Gen4 x4 and Samsung 128-layer V6 TLC, delivering up to 6,800/4,000 MB/s sequential throughput and 1,000,000/180,000 IOPS for a clear boost in bandwidth and transaction density. Its 1.92 TB capacity with 1 DWPD and 3,504 TBW makes it a strong fit for read-centric to mixed enterprise workloads such as virtualized infrastructure, scale-out storage, and high-throughput content delivery where consistent NVMe 1.4 performance and predictable endurance are critical.

Endurance & Reliability

With an endurance rating of 3504 TBW and 1 DWPD, the MZ-QL21T900 is built to handle writing its full capacity once per day across its warranted service life, which is more than sufficient for typical server boot, application, and mixed enterprise workloads. In practical terms, under normal system-disk or general read-centric deployment, this level of endurance provides long-term peace of mind and can comfortably support many years of stable operation without write-life concerns. For enterprise reliability, the drive includes power-loss protection (PLP), which helps preserve in-flight data and metadata during unexpected power interruptions, reducing the risk of corruption and improving system recovery confidence. Its enterprise-class UBER of 1.0E-17, together with a 2 million hour MTBF, indicates a very low likelihood of unrecoverable bit errors and strong overall dependability for business-critical storage environments.

Technical Specs & Insights

1. The PCIe Gen4 x4 interface with NVMe 1.4 gives modern servers a high-bandwidth, low-overhead data path that accelerates virtualization, analytics, and scale-out storage workloads.
2. Its strong sequential read performance helps large databases, backup repositories, and AI pipelines pull massive datasets faster, reducing job start times and query wait time.
3. The high random read capability supports dense VM farms and latency-sensitive transactional applications by sustaining heavy parallel access without becoming a bottleneck.
4. This endurance rating is well suited to mixed-read enterprise environments, providing predictable lifespan and simpler capacity planning for always-on business systems.
5. Samsung’s V6 TLC NAND balances performance, density, and reliability, making it a practical choice for mainstream data center deployments that need consistent service quality at scale.

Capacity Sweet

Lower reference capacity: 960 GB Higher reference capacity: 3.84 TB In this series, the 1.92 TB model sits at the sweet spot between the 960 GB and 3.84 TB options. Compared with 960 GB, it gives meaningfully better headroom for OS, application, log, and growth planning, reducing early capacity pressure in production environments. Compared with 3.84 TB, it typically delivers a better balance of acquisition cost, usable capacity, and standard enterprise SSD performance, since sequential throughput and random IOPS are broadly similar across adjacent capacities. It is well suited for medium-scale virtualization clusters, database replicas, and mixed enterprise application nodes.

FAQ