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“1 DWPD” 到底能写多少？把寿命账算清楚
采购中最常见的误判是”1 DWPD 不够用”。算一笔账：15.36TB 容量 x 1 DWPD x 365 天 x 5 年 = 约 28 PBW 的终身写入预算。对虚拟化、数据库、云和 Web 服务这些读多写少的主流负载，绝大多数部署在 5 年生命周期内连一半都用不到。
更反直觉的一点：容量越大，1 DWPD 越耐用。7.68TB 的 1 DWPD 比 1TB 的 7 DWPD 多出近 8 倍的写入预算 – 这正是大容量企业盘把耐久分级放宽到 1 DWPD 的原因。Solidigm D7-P5520 就是这个逻辑的典型：1 DWPD 主流级，适合作为主存储替换盘；写密集场景再上 D7-P5620（3 DWPD）。
Core Specifications
| يصف | تخصيص |
|---|---|
| واجهة | PCIe 4.0 x4, NVME |
| Form factors | U.2 15mm, E1.S 9.5/15mm, E1.L 9.5mm |
| سعة | 1.92تيرابايت / 3.84تيرابايت / 7.68تيرابايت / 15.36تيرابايت |
| Sequential read / write | 7,000 ميغابايت/ق / 4,200 ميغابايت/ق |
| Random read / write (4K) | 1,100,000 / 220,000 IOPS |
| Latency (seq / rand) | 10 us / 13 us; 75 us / 20 us |
| Endurance | 1 DWPD; 28.0 PBW (15.36تيرابايت) |
| MTBF | 2,000,000 ساعات |
| قوة | 20 W active / 5 W idle |
| حماية | AES-256, TCG Opal 2.0, فايبس 140-3 L2 (U.2 15mm) |
Performance That Stays Consistent
The D7-P5520 delivers up to 7,000 MB/s sequential read and 4,200 MB/s sequential write (128كيلو بايت), with 1.1M random read IOPS and 220K random write IOPS at 4K. Latency ratings are 10us/13us sequential and 75us/20us random. What matters more for production is consistency: the D7 series runs PLI (Power Loss Imminent) testing under real-world conditions and holds up to 90% IOPS consistency with under 0.3% variability across the drive’s life – no cliff-drop after the SLC cache fills.
Form Factors and Deployment
The D7-P5520 ships in U.2 15mm (the standard 2.5-inch slot found in virtually every enterprise server), E1.S 9.5/15mm for 1U high-density NVMe, and E1.L 9.5mm for extreme-capacity storage nodes. The U.2 version covers 1.92TB through 15.36TB in the same footprint, so capacity upgrades are a drive swap, not a chassis change. With heritage from Intel’s data center SSD team, the D7 family inherits the firmware maturity and platform validation ecosystem that enterprise buyers rely on.
Security and Telemetry
Hardware AES-256 encryption with TCG Opal 2.0 إدارة, و فايبس 140-3 Level 2 certification on the U.2 15mm models (1.92TB-15.36TB) for regulated environments. Operational features include PCIe VDM support, variable sector sizes (512/4K), scatter-gather with dataset management, advanced telemetry logs, dynamic namespaces and device self-test – the hooks modern storage stacks and fleet-management tools expect.
Reliability Numbers
- Endurance: 28.0 PBW on 15.36TB (1 DWPD) – roughly 5 years of full-drive writes per day.
- MTBF: 2 million hours, with PLI (Power Loss Imminent) design tested under real-world power events.
- Consistency: يصل إلى 90% IOPS consistency, <0.3% variability across life.
- Form-factor breadth: U.2 / E1.S / E1.L – one controller platform across server and storage node designs.
Buying FAQ
- Is 1 DWPD enough? For virtualization, قواعد بيانات, cloud and web workloads, yes – see the endurance math above.
- P5520 vs P5620? P5520 = 1 DWPD mainstream; P5620 = 3 DWPD for mixed/write-heavy workloads.
- FIPS available? فايبس 140-3 L2 on U.2 15mm 1.92-15.36TB models.
- Best-fit servers? Any server with U.2 NVMe bays – يصل إلى 24 in a PowerEdge R760 أو 28 in an xFusion 2288H V7.
Building a high-capacity NVMe tier? The 15.36TB U.2 delivers the largest single-drive capacity in its class for dense storage nodes. As an authorized distributor we offer factory-direct pricing, global shipping, free consultation and custom configuration – contact us for the best per-TB quote.
