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| Brand | Samsung |
|---|---|
| Model | PM1635a |
| Capacity | 800GB |
| 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 | 4380 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 | MZILS800HEGR |
|---|
Compared with the previous-generation MZILS800HEGR, the Samsung PM1635a (MZILS800HEHP0D3) delivers a clear generational step forward by pairing 12Gb/s SAS performance of up to 1350/1100 MB/s and 190,000/35,000 IOPS with 3 DWPD endurance and 4,380 TBW in the same 800GB class. Its Samsung V-NAND 3bit MLC (TLC) design makes it a strong choice for mixed-read enterprise databases, virtualization clusters, and transactional workloads that need higher endurance and more consistent latency than entry SAS SSDs at this capacity point.
With an endurance rating of 4,380 TBW and 3 DWPD, the MZILS800HEHP0D3 is built for sustained enterprise write workloads and can comfortably support typical OS, application, and logging duties over many years of service. In practical terms, for common system-disk or mixed-read/write deployments, this level of endurance provides ample headroom for long-term operation without endurance becoming a day-to-day concern. For enterprise reliability, the drive includes power-loss protection (PLP), which helps preserve in-flight data and metadata if power is interrupted unexpectedly, reducing the risk of corruption and unplanned recovery events. Its ultra-low UBER of 1.0E-17, together with a 2 million hour MTBF, indicates very strong data integrity and dependability, giving procurement teams confidence for business-critical environments.
1. The SAS 12Gb/s interface, paired with strong sequential read bandwidth, enables stable shared-storage performance for enterprise arrays, accelerating backup, restore, and large-file analytics workflows.
2. Its high random read capability helps databases, virtual desktop pools, and OLTP platforms sustain fast response times under heavily concurrent small-block access.
3. A 3 DWPD endurance rating makes it well suited for write-intensive enterprise workloads such as logging, caching, and mixed-use virtualization without premature wear concerns.
4. Samsung V-NAND 3bit MLC (TLC) provides a balanced combination of density, power efficiency, and cost effectiveness, making it practical for scaling business-critical storage capacity.
5. The low typical latency supports more predictable QoS, reducing application wait time for latency-sensitive environments like transactional systems and real-time data services.
Lower capacity reference: 400GB Higher capacity reference: 1.6TB In this series, the 800GB model sits at the sweet spot for mainstream enterprise deployment. Compared with the 400GB version, it gives meaningfully better space headroom for OS images, logs, swap, and moderate application growth, reducing early capacity pressure. Compared with the 1.6TB option, it preserves nearly the same enterprise-class sequential and random performance profile while keeping acquisition cost and per-node storage budgeting under tighter control. It is best suited for medium-scale virtualization clusters, such as hosting boot and utility volumes for roughly 40 to 60 virtual machines.
Q: Is MZILS800HEHP0D3 suitable for a write-heavy database server?
A: Yes. With 3 DWPD endurance, 4380 TBW, 12Gb/s SAS, and 110 µs typical latency, MZILS800HEHP0D3 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 model is rated for 3 full drive writes per day. For an 800GB capacity, that equals about 2.4TB of writes daily within its specified warranty endurance target.
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 sudden outages, reducing corruption risk and improving reliability in servers, RAID arrays, and databases.
Q: What RAID level is recommended for this SSD?
A: RAID 10 is typically recommended for performance-critical and write-heavy applications, while RAID 5 or RAID 6 may fit capacity-focused environments. The best choice depends on performance, redundancy, and budget requirements.