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| Brand | Samsung |
|---|---|
| Model | PM1635a |
| Capacity | 400 GB |
| Usage Class | Mixed Use |
| Host Interface | SAS 12.0 Gbps |
|---|---|
| Total Interface Bandwidth | 12 Gb/s |
| Form Factor | 2.5" |
|---|
| NAND Flash | Samsung V-NAND 48-layer 3D TLC |
|---|---|
| Drive Writes Per Day | 3 |
| Total Bytes Written | 2190 TBW |
| Sequential Read | 1300 MB/s |
|---|---|
| Sequential Write | 820 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 | MZ-WJJ1T60 |
|---|
Compared with the previous-generation MZ-WJJ1T60, the Samsung PM1635a (MZ-ILS400N) advances to a 12.0 Gbps SAS interface and 48-layer V-NAND 3D TLC, delivering up to 1300/820 MB/s and 190,000/35,000 IOPS while sustaining enterprise-class 3 DWPD endurance. This 400 GB model is a strong fit for read-intensive to mixed enterprise workloads such as database logging, virtualization boot/storage tiers, and transaction-heavy application servers, where its 2190 TBW rating and SAS reliability provide a clearer endurance-and-performance advantage than typical same-class SATA SSDs.
With an endurance rating of 2,190 TBW and 3 DWPD, the MZ-ILS400N is designed to handle intensive daily write workloads with substantial margin, making it a strong fit for OS, application, and frequently updated business data. In typical enterprise or industrial use, this level of endurance means the drive can serve reliably for many years, and as a system boot drive it can generally be deployed with confidence for long-term operation. The MZ-ILS400N also includes enterprise-class power loss protection, which helps preserve in-flight data and prevent metadata corruption if power is interrupted unexpectedly. Combined with an ultra-low UBER of 1.0E-17 and a 2 million hour MTBF, it is built to deliver very high data integrity and dependable operation in mission-critical environments.
1. The dual-port SAS interface, paired with strong sequential bandwidth, enables fast movement of backups, virtual machine images, and large analytics files while maintaining the high availability expected in enterprise storage.
2. Its high random read capability supports dense virtualization, online transaction processing, and metadata-heavy workloads by accelerating access to small, scattered data blocks at scale.
3. The enterprise endurance rating allows the drive to sustain heavy daily overwrite cycles, making it well suited for write-intensive databases, caching tiers, and mixed-use server workloads.
4. Built with Samsung V-NAND 3D TLC, it balances enterprise-class capacity efficiency, power characteristics, and reliability for mainstream data center deployment.
5. The low typical latency helps reduce application response time, improving consistency for latency-sensitive services such as real-time analytics, trading platforms, and high-concurrency databases.
Lower-capacity reference: 200 GB Higher-capacity reference: 800 GB In the MZ-ILS series, the 400 GB model sits at the practical sweet spot. Compared with the 200 GB version, it gives noticeably better space headroom for OS images, logs, swap, and steady application growth, reducing the risk of early capacity pressure. Compared with the 800 GB model, it preserves the same enterprise-class performance profile while keeping acquisition cost and per-node storage budgets under tighter control. It is especially well suited for mid-sized virtualization clusters, such as hosting boot and utility volumes for about 30 to 50 infrastructure servers.
Q: Is MZ-ILS400N suitable for a write-heavy database server?
A: Yes. MZ-ILS400N is suitable for write-intensive database workloads, with 3 DWPD endurance, 2190 TBW, 12 Gbps SAS interface, low 110 µs latency, and enterprise-class Samsung 48-layer V-NAND TLC.
Q: How many full drive writes per day can it actually endure over its warranty period?
A: This model is rated at 3 DWPD, meaning it can support three full 400 GB drive writes per day throughout its warranty period, consistent with its total 2190 TBW endurance rating.
Q: Does it include power loss protection (PLP) and why is that critical?
A: Yes, it includes power loss protection. PLP is critical in enterprise environments because it helps preserve in-flight data and metadata during sudden outages, reducing corruption risk and improving system reliability.
Q: What RAID level is recommended for this SSD?
A: RAID choice depends on your workload. For database servers, RAID 10 is commonly recommended for the best balance of performance, redundancy, and rebuild efficiency when using enterprise SAS SSDs.