HP Enterprise SSDs Explained: SAS vs SATA vs NVMe, Read-Intensive vs Mixed-Use (DWPD)
How to read an HPE SSD and pick the right one — the endurance tiers (Read-Intensive, Mixed-Use, Write-Intensive) and what DWPD actually means, plus SATA vs SAS vs NVMe, U.2/U.3 form factors, and where M.2 boot drives fit. With real HPE part numbers from current inventory.
TL;DR — pick by endurance first, then interface
HPE labels every enterprise SSD by how much you can write to it per day, expressed as DWPD (drive writes per day over a 5-year warranty):
- Read-Intensive (RI) — ~1 DWPD or less. Boot, web, read caches, analytics reads, VDI linked clones. The cheapest per TB.
- Mixed-Use (MU) — ~3 DWPD. Databases, virtualization, write-heavy apps. The balanced, do-everything tier.
- Write-Intensive (WI) — ~10 DWPD. Caching tiers, logging, heavy OLTP. Highest endurance, highest cost.
Per HPE: "DWPD is the maximum number of 4K host writes to the entire drive capacity per day over a five-year period" (HPE Solid State Disk Drives QuickSpecs). Match the tier to your write workload and you avoid both burning out an RI drive and overpaying for a WI drive you don't need.
---
The endurance tiers in practice
| Tier | Endurance | Good for | Example from inventory |
|---|---|---|---|
| Read-Intensive | ~1 DWPD | Boot, web, read caches, VDI | HPE P48228-001 (480GB SATA RI), P40564-B21 (960GB NVMe Gen4 RI U.3) |
| Mixed-Use | ~3 DWPD | Databases, virtualization | HPE P42574-001 (800GB SAS 24G MU), P73302-B21 (3.2TB NVMe MU U.3) |
| Write-Intensive | ~10 DWPD | Caching, logging, heavy OLTP | HPE EO000400JWTBV (400GB SAS 12G WI) |
A common, cost-smart pattern: RI for the OS/boot and read-mostly volumes, MU for the database datastore. You rarely need WI unless you're running a dedicated write-cache tier.
---
Interface: SATA vs SAS vs NVMe
- SATA 6Gb/s — lowest cost, single-port, fine for boot and light read workloads (e.g., HPE P47811-B21 960GB SATA RI).
- SAS 12G / 24G — dual-port (path redundancy), higher queue depth, the enterprise HDD/SSD standard. 24G SAS (e.g., P41011-001 960GB TLC SAS 24G RI) is the newest tier.
- NVMe (PCIe Gen3/Gen4) — connects to PCIe lanes directly, the highest IOPS and lowest latency. Modern HPE NVMe SSDs use the U.3 connector (e.g., P73302-B21 3.2TB MU U.3, P40990-001 PM1733 3.84TB Gen4).
Rule of thumb: NVMe for performance-critical databases and analytics; SAS for balanced enterprise workloads and redundancy; SATA for boot and cost-sensitive reads.
---
U.2 vs U.3 (don't get caught out)
Both are 2.5-inch connectors. U.3 is backward compatible — a U.3 backplane can take U.3 NVMe, plus SAS and SATA drives in the same bay. U.2 is not as flexible. When buying NVMe SSDs, confirm your ProLiant generation's backplane: Gen10 Plus and Gen11 typically use U.3. Mixing U.2 drives into a U.3-tri-mode backplane usually works; the reverse may not.
---
Where M.2 / boot devices fit
For the OS, many ProLiant servers use M.2 boot drives (e.g., HPE V3K67UT 512GB M.2 NVMe, 1DE48AA 256GB SATA M.2), often on a dedicated boot controller so your data SSDs stay fully available for the workload. Keep OS and data on separate devices where you can.
---
Capacity range you can actually buy
HPE enterprise SSDs scale from 240GB-480GB boot-class units up to 15.36TB NVMe (e.g., HPE P74824-B21). Bigger isn't always better: more capacity on a single drive concentrates risk and rebuild time, so balance density against your RAID design — see our HP ProLiant RAID level guide.
---
FAQ
What does DWPD mean again? Drive Writes Per Day — how many times you could overwrite the whole drive every day for five years and stay in warranty. 1 DWPD on a 1TB drive = 1TB of writes/day.
Can I put an SSD where an HDD was? Generally yes if the interface and carrier match (SAS/SATA SSDs drop into SAS/SATA bays). NVMe needs NVMe-capable (U.2/U.3) bays.
RI or MU for a VM host? MU. Virtualization mixes reads and writes; ~3 DWPD gives headroom. Use RI only for read-mostly or boot.
New vs refurbished SSDs? New carries the manufacturer warranty and full rated endurance. Reputable refurbished/used-pull SSDs should come with a reported health/wear percentage — ask for it. Pro Disk Network is an independent reseller of genuine HPE drives (not affiliated with HPE) and tests drives before shipping.
---
Related: HP Enterprise SAS Hard Drives · HPE Smart Array Controllers · HP Storage Solutions overview. Shop HP server storage.
Source: HPE Solid State Disk Drives QuickSpecs. Pricing/availability reflect Pro Disk Network US inventory.