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| Brand | Samsung |
|---|---|
| Model | PM9A3 |
| Capacity | 1.92 TB |
| Usage Class | Enterprise / Data Center Read Intensive |
| Host Interface | PCIe Gen4 x4, NVMe 1.4 |
|---|---|
| Total Interface Bandwidth | 64 Gb/s |
| Form Factor | 2.5 |
|---|
| NAND Flash | Samsung V6 TLC |
|---|---|
| Drive Writes Per Day | 1 |
| Total Bytes Written | 3504 TBW |
| Sequential Read | 6800 MB/s |
|---|---|
| Sequential Write | 4000 MB/s |
| Random Read IOPS | 1000000 |
| Random Write IOPS | 180000 |
| Average Latency | 80 μs |
| Mean Time Between Failures | 2 Million Hours |
|---|---|
| Uncorrectable Bit Error Rate | 1.0×10⁻¹⁷ |
| Power Loss Protection | Yes |
| MPN | MZ-QLB1T90 |
|---|
Compared with the previous-generation MZ-QLB1T90, the PM9A3 MZ-QL21T90 upgrades to a PCIe Gen4 x4, NVMe 1.4 platform with Samsung V6 TLC NAND, delivering up to 6800/4000 MB/s and 1,000,000/180,000 IOPS for a clear step up in throughput and transaction responsiveness. With 1.92 TB capacity, 1 DWPD endurance, and 3504 TBW, it is a strong fit for read-centric to mixed enterprise workloads that need higher Gen4 performance without moving to a higher-endurance, higher-cost SSD tier.
With an endurance rating of 3504 TBW and 1 DWPD, the MZ-QL21T90 is designed to handle about 3.5 petabytes of total host writes, which is far beyond the write volume of a typical OS, boot, or read-heavy application drive. In practical terms, under normal enterprise system-disk or general server workloads, this level of endurance provides long service life with ample write headroom and helps reduce concerns about premature wear. For enterprise reliability, the drive includes Power Loss Protection (PLP), which helps preserve in-flight data and protects mapping-table integrity if power is unexpectedly interrupted. Its ultra-low UBER of 1.0E-17, together with a 2 million hour MTBF, indicates very strong data integrity and dependable long-term operation in business-critical environments.
1. The PCIe Gen4 x4 interface with NVMe 1.4 unlocks host-side bandwidth and parallel command handling that helps enterprise servers eliminate storage bottlenecks in dense virtualized and data-intensive environments.
2. Its class-leading sequential read performance accelerates large file streaming, database snapshot recovery, and AI model loading, reducing time-to-data for throughput-heavy workloads.
3. The ultra-high random read capability enables fast response under heavily concurrent access, making it well suited for OLTP databases, metadata services, and high-traffic cloud platforms.
4. A 1 DWPD endurance rating provides predictable write sustainability for mainstream enterprise workloads, balancing long service life with efficient infrastructure TCO.
5. Samsung V6 TLC NAND paired with typical latency in the tens of microseconds delivers a strong mix of flash density, consistent QoS, and snappy application responsiveness for latency-sensitive production systems.
Lower capacity reference: 960 GB Higher capacity reference: 3.84 TB At 1.92 TB, the MZ-QL21T90 sits in the sweet spot of the series. Compared with the 960 GB model, it offers much better headroom for OS images, application growth, snapshots, and cache without forcing early capacity expansion. Compared with the 3.84 TB option, it usually delivers the best balance of acquisition cost, usable capacity, and enterprise-class performance consistency. This makes it a strong fit for mid-scale deployments, such as a 2-node virtualization cluster hosting around 40 to 60 mixed-workload virtual machines.
Q: Is MZ-QL21T90 suitable for a write-heavy database server?
A: Yes, MZ-QL21T90 can support write-intensive database workloads. With 1 DWPD, 3504 TBW, Samsung V6 TLC NAND, and low 80 µs latency, it fits enterprise transactional environments well.
Q: How many full drive writes per day can it actually endure over its warranty period?
A: It is rated for 1 full drive write per day over its warranty period. For a 1.92 TB drive, that equals about 1.92 TB of writes daily, within specification.
Q: Does it include power loss protection (PLP) and why is that critical?
A: Yes, this model includes power loss protection. PLP helps preserve in-flight data and metadata during unexpected outages, which is critical for database integrity, consistency, and enterprise system reliability.
Q: What RAID level is recommended for this SSD?
A: For most enterprise deployments, RAID 10 is recommended for the best balance of performance, redundancy, and low latency. RAID 1 is also suitable when capacity needs are smaller.