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| Brand | Samsung |
|---|---|
| Model | PM9A3 |
| Capacity | 1.92 TB |
| Usage Class | Enterprise/Read-Intensive |
| Host Interface | PCIe 4.0 x4, NVMe 1.4 |
|---|---|
| Total Interface Bandwidth | 64 Gb/s |
| Form Factor | EDSFF E1.S (9.5mm) |
|---|
| NAND Flash | Samsung V6 (128L) TLC |
|---|---|
| Drive Writes Per Day | 1 |
| Total Bytes Written | 3504 TBW |
| Sequential Read | 6800 MB/s |
|---|---|
| Sequential Write | 4000 MB/s |
| Random Read IOPS | 850000 |
| Random Write IOPS | 160000 |
| Average Latency | 85 μs |
| Mean Time Between Failures | 2 Million Hours |
|---|---|
| Uncorrectable Bit Error Rate | 1.0×10⁻¹⁷ |
| Power Loss Protection | Yes |
| MPN | MZ1LB1T9HMLA |
|---|
Compared with the earlier MZ1LB1T9HMLA, Samsung’s PM9A3 MZ-1L21T90 steps up to a PCIe 4.0 x4 / NVMe 1.4 platform with 128-layer V6 TLC, delivering up to 6,800/4,000 MB/s and 850K/160K IOPS for a clear generational gain in bandwidth and transaction throughput. At 1.92 TB with 1 DWPD and 3,504 TBW, it provides a stronger performance-per-slot balance than its predecessor for mixed-read virtualization clusters, scale-out databases, and high-density cloud nodes while maintaining enterprise-class write endurance.
With an endurance rating of 3504 TBW and 1 DWPD, the MZ-1L21T90 is designed to handle writing its full capacity once per day throughout its rated service life, which is more than sufficient for typical enterprise boot, system, and mixed-use workloads. In practical terms, under normal operating conditions it can serve reliably as a system drive for many years without endurance becoming a concern, giving procurement teams confidence in long-term deployment stability. For enterprise reliability, the drive includes power-loss protection (PLP), which helps preserve in-flight data and protect metadata integrity if power is suddenly interrupted. Its UBER of 1.0E-17 indicates an extremely low probability of unrecoverable bit errors during reads, supporting dependable data integrity for business-critical environments.
1. The PCIe 4.0 x4 interface with NVMe 1.4 unlocks host-side bandwidth and parallel queue efficiency that help virtualized databases and analytics clusters keep CPUs fed instead of waiting on storage.
2. With sequential reads up to 6800 MB/s, this drive can accelerate large block workloads such as AI model loading, backup restore, and media dataset streaming.
3. Random read performance of 850,000 K IOPS enables fast access to massive small-file and index-heavy workloads, improving VM density and reducing query response bottlenecks.
4. Rated at 1 DWPD, it is well suited for read-centric enterprise deployments that need predictable lifespan under continuous daily production use without overpaying for higher write endurance.
5. Built on Samsung V6 (128L) TLC NAND and delivering typical latency of 85 µs, the drive provides a strong balance of flash efficiency and responsive QoS for latency-sensitive cloud and transactional applications.
Reference lower capacity: 960 GB Reference higher capacity: 3.84 TB In this series, 1.92 TB is the practical sweet spot. Compared with the 960 GB model, it offers much better headroom for OS images, application data, logs, and growth, reducing the risk of early capacity pressure. Compared with the 3.84 TB model, it usually delivers the best balance of acquisition cost, usable capacity, and enterprise-grade performance, since sequential throughput and random IOPS remain broadly similar across these capacities. It is especially well suited for mid-scale virtualization clusters, such as supporting about 40 to 60 general-purpose virtual machines or a compact mixed-workload database node.
Q: Is MZ-1L21T90 suitable for a write-heavy database server?
A: MZ-1L21T90 is better suited for mixed-use enterprise workloads rather than extremely write-heavy databases. With 1 DWPD, 3504 TBW, TLC NAND, and low latency, it supports steady transactional performance well.
Q: How many full drive writes per day can it actually endure over its warranty period?
A: This model is rated at 1 DWPD, meaning it can sustain one full 1.92 TB drive write per day throughout its warranty period, consistent with its 3504 TBW endurance specification.
Q: Does it include power loss protection (PLP) and why is that critical?
A: Yes, it includes power loss protection. PLP helps preserve in-flight data and metadata during unexpected outages, which is critical for enterprise systems requiring data integrity, consistency, and reduced corruption risk.
Q: What RAID level is recommended for this SSD?
A: RAID 1, RAID 10, or RAID 5/6 may be selected depending on performance and redundancy goals. For databases and virtualization, RAID 10 is commonly recommended for balanced speed, resilience, and recovery.