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| Brand | Samsung |
|---|---|
| Model | PM1635a |
| Capacity | 3.2TB |
| Usage Class | Enterprise |
| Host Interface | SAS 12Gb/s |
|---|---|
| Total Interface Bandwidth | 12 Gb/s |
| Form Factor | 2.5 |
|---|
| NAND Flash | Samsung V-NAND 3bit MLC (TLC) |
|---|---|
| Drive Writes Per Day | 3 |
| Total Bytes Written | 17520 TBW |
| Sequential Read | 1350 MB/s |
|---|---|
| Sequential Write | 1100 MB/s |
| Random Read IOPS | 190000 |
| Random Write IOPS | 35000 |
| Average Latency | 110 μs |
| Mean Time Between Failures | 2 Million Hours |
|---|---|
| Uncorrectable Bit Error Rate | 1.0×10⁻¹⁷ |
| Power Loss Protection | Yes |
| MPN | MZILS3T2HEGR |
|---|
Compared with the earlier MZILS3T2HEGR, the PM1635a (MZILS3T2HMLH0D3) brings a newer Samsung 3bit V-NAND design to the 3.2TB SAS 12Gb/s tier, delivering up to 1350/1100 MB/s and 190K/35K IOPS while maintaining enterprise-class endurance at 3 DWPD and 17,520 TBW. This balance of capacity, sustained write durability, and higher mixed-workload responsiveness gives it a clear edge over read-focused SAS SSDs in OLTP databases, virtualization clusters, and other 24/7 enterprise workloads that need predictable write performance.
With an endurance rating of 17,520 TBW and 3 DWPD, the MZILS3T2HMLH0D3 is built for sustained write-intensive enterprise use, providing ample margin for databases, virtualization, caching, and other 24/7 workloads. In practical terms, this level of endurance means it can comfortably handle typical server or system-disk workloads for many years, giving procurement teams confidence that write wear is unlikely to be a limiting factor in normal deployment. Its enterprise-grade reliability is further strengthened by Power Loss Protection (PLP), which helps preserve in-flight data and metadata during an unexpected power interruption, reducing the risk of corruption and unplanned recovery events. An UBER of 1.0E-17 indicates an extremely low uncorrectable bit error rate, supporting high data integrity in large-scale storage environments, while the 2 million-hour MTBF reinforces confidence in long-term operational stability.
1. The SAS enterprise interface ensures seamless integration with dual-controller storage arrays, while its strong sequential bandwidth accelerates backups, restores, and large-scale data streaming.
2. Its high random-read capability keeps transaction-heavy databases and virtual desktop environments responsive even under intense concurrent access.
3. The endurance rating is built for sustained daily rewrites, making it a reliable fit for mixed-use workloads such as virtualization, analytics, and OLTP.
4. Samsung V-NAND TLC balances capacity, power efficiency, and cost, giving enterprises a practical flash tier for scaling performance without overspending.
5. The low typical latency helps reduce application wait time, improving consistency for latency-sensitive services like real-time databases and business-critical enterprise apps.
Lower capacity reference: 1.6TB Higher capacity reference: 6.4TB Capacity positioning analysis: In this series, 3.2TB sits at the practical sweet spot. Compared with the 1.6TB option, it gives materially better space headroom for growth, reducing early drive saturation and lowering the need for frequent capacity planning adjustments. Compared with the 6.4TB model, it typically delivers a stronger cost-to-usable-capacity balance while keeping enterprise-class throughput and latency characteristics essentially unchanged. This makes 3.2TB a strong fit for mid-scale virtualization clusters, database nodes, or analytics servers that need solid density without overcommitting storage budget.
Q: Is MZILS3T2HMLH0D3 suitable for a write-heavy database server?
A: Yes. With 3 DWPD, 17,520 TBW endurance, SAS 12Gb/s, and 110 µs typical latency, MZILS3T2HMLH0D3 is well suited for write-intensive database and enterprise transactional workloads.
Q: How many full drive writes per day can it actually endure over its warranty period?
A: This SSD is rated for 3 DWPD, meaning it can support three full 3.2TB drive writes per day throughout its warranty term, assuming operation within the specified enterprise conditions.
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, reducing corruption risk and maintaining data integrity in mission-critical server environments.
Q: What RAID level is recommended for this SSD?
A: For write-heavy database workloads, RAID 10 is typically recommended because it delivers strong write performance, low latency, and redundancy. RAID 5 or 6 may suit capacity-focused, less write-intensive applications.