HPE ProLiant DL360 Gen10 Smart Array Controllers Compared

Choosing among HPE Smart Array controllers for the HPE ProLiant DL360 Gen10 is not simply a matter of selecting the newest or most expensive model. Your decision affects drive compatibility, RAID protection, write performance, expansion capacity, cabling, and upgrade flexibility. This matters whether you are configuring a small operating-system mirror or a heavily virtualized server.

The key difference is between the S100i software option and dedicated hardware RAID adapters. The S100i is attractive for basic SATA mirroring, while the E208i models provide practical SAS and SATA connectivity. The P408i-a is the strongest general-purpose choice for demanding workloads, and the P816i-a makes the most sense when you need many internal drive connections and greater array flexibility.

Which Smart Array controllers work with the HPE ProLiant DL360 Gen10?

S100i SR Gen10 versus dedicated hardware RAID

The S100i SR Gen10 software RAID is integrated into the platform and is intended primarily for economical SATA configurations. It can provide a simple boot-volume mirror without adding a dedicated controller, but it uses server resources and does not offer the same acceleration or protected cache as a hardware adapter. Dedicated hardware RAID models such as the E208i, P408i-a, and P816i-a handle parity and array operations independently.

Internal and external controller form factors

The E208i-a SR Gen10 is an embedded internal controller, while the E208i-p SR Gen10 is a PCIe plug-in design. The P408i-a and P816i-a are also internal choices, with different port and lane capacities. External Smart Array models are not automatically substitutes for these internal controllers, so confirm the server's intended storage topology before ordering.

How drive-bay and backplane choices affect compatibility

The server's front drive cage, backplane, cabling, and drive type determine which controller can actually be installed. A SAS backplane and suitable cables are required for SAS arrays, while a SATA-only configuration may make the S100i adequate. Compatibility is therefore a complete system question, not just a controller question. Verdict: Choose the S100i for simple SATA storage; choose a dedicated internal Smart Array controller when you need SAS, protected caching, or broader array capability.

How do the main DL360 Gen10 Smart Array controllers compare?

S100i SR Gen10: entry-level software RAID

The HPE Smart Array S100i SR Gen10 is the budget choice for a small SATA array. It is appropriate for a basic operating-system mirror, a lightly used file server, or a lab system where minimizing hardware cost matters more than maximum I/O consistency. Its limitations become more visible under parity writes, heavy queue depth, or sustained virtualization activity.

E208i-a and E208i-p: practical SAS/SATA RAID options

The HPE Smart Array E208i-a SR Gen10 and HPE Smart Array E208i-p SR Gen10 occupy the practical middle ground. They support enterprise SAS and SATA connectivity and provide a cleaner dedicated-controller architecture than the S100i. The main distinction is installation format: the a-model is embedded, while the p-model uses a PCIe slot. Confirm cache features and included accessories for the exact configuration.

P408i-a and P816i-a: performance and high-capacity choices

The HPE Smart Array P408i-a SR Gen10 is usually the balanced performance option, adding stronger RAID processing and protected write-cache capability for demanding workloads. The HPE Smart Array P816i-a SR Gen10 targets larger internal arrays and more extensive drive connectivity. It is more compelling when drive count and expansion flexibility outweigh controller cost. Verdict: The P408i-a is the best all-rounder, while the P816i-a wins for large internal arrays.

What RAID levels and drive types does each controller support?

RAID 0, 1, 5, 6, and 10 use cases

RAID 0, 1, 5, 6, and 10 serve different purposes. RAID 0 provides speed without protection, RAID 1 mirrors two drives, RAID 10 combines mirroring with strong performance, and RAID 5 or 6 use parity to protect larger arrays. The S100i is most sensible for basic RAID 1 or other supported entry-level SATA layouts. Dedicated controllers are better suited to parity arrays and workloads where rebuild behavior matters.

SAS versus SATA and HDD versus SSD considerations

SAS and SATA drive support is a major dividing line. SAS drives generally offer enterprise dual-porting and stronger compatibility expectations, while SATA drives can reduce cost. SSDs deliver lower latency and higher I/O rates, but they also make controller and cache limitations easier to notice. HDD arrays benefit from mirroring, sequential workloads, and careful rebuild planning.

Mixed-drive and array-expansion limitations

Do not assume any two drives can be mixed freely. Arrays generally require compatible capacity, sector format, interface, and performance characteristics. Mixing drive classes can make the array operate at the slowest member's practical limits. Expansion also depends on controller support, available bays, and migration rules. Verdict: Select the controller after defining the exact RAID level and drive population, not before.

How important are cache, performance, and resiliency?

Flash-backed write cache and write performance

Flash-backed write cache protects acknowledged writes during a power interruption by preserving cache contents for recovery. That can improve write latency and parity performance, especially when the workload issues many small random writes. The S100i does not provide the same dedicated protected-cache behavior as performance-oriented Smart Array controllers. Exact cache size and protection method vary by controller and installed option, so check the configured SKU.

Queue depth, IOPS, and latency for common workloads

For a lightly used file server, the difference between entry-level and performance controllers may be modest. Under virtualization, database logging, or multiple concurrent applications, queue depth rises and controller processing becomes more important. SSDs can expose these bottlenecks quickly, while HDDs may remain limited by mechanical latency.

Why database and virtualization workloads need more than basic mirroring

Databases and virtual machines create mixed read and write patterns, bursts, synchronization traffic, and frequent small updates. A controller with stronger RAID acceleration and protected cache can maintain more predictable response times than software mirroring. It cannot compensate for unsuitable drives or insufficient memory, but it removes a common storage bottleneck. Verdict: Use the P408i-a or a higher model when consistent write performance and recovery behavior matter.

Which controller should you choose for your workload?

Best option for a low-cost operating-system mirror

Choose the S100i when your goal is a simple boot-volume mirror using compatible SATA drives. It keeps the bill of materials low and is often sufficient for a small office server, test host, or lightly loaded application server. It is not the right choice when you need protected write cache, extensive SAS connectivity, or high parity performance.

Best option for virtualization, databases, and heavy mixed workloads

For a production virtualization host or database server, the P408i-a SR Gen10 is the strongest general recommendation. It offers dedicated RAID processing and flash-backed cache protection without being as specialized or costly as the largest controller. The E208i models remain reasonable for moderate workloads, particularly when the array design is straightforward.

Best option for large arrays and maximum drive flexibility

Choose the P816i-a when the DL360 Gen10 has a dense internal drive configuration and you need more connectivity or array headroom. Its value increases with drive count, larger parity layouts, and future expansion plans. It is excessive for a two-drive mirror. Verdict: S100i wins on price, P408i-a wins for most demanding workloads, and P816i-a wins when scale is the priority.

How do you configure and manage a Smart Array controller?

Creating arrays with HPE Smart Storage Administrator

HPE Smart Storage Administrator is the main tool for discovering controllers and drives, creating logical drives, selecting RAID levels, and reviewing array status. Use it during deployment or maintenance rather than guessing from the operating system. Confirm that the proposed logical-drive layout matches the intended boot and data volumes before initializing drives.

Monitoring storage health through HPE iLO 5

HPE iLO 5 can expose controller, drive, fan, power, and system health information through its management interface. Set alerts for predictive drive failures, degraded arrays, temperature events, and cache or battery protection issues. HPE InfoSight may add fleet-level analytics and support insight where the server and service configuration qualify.

Firmware, driver, and operating-system compatibility checks

Update controller firmware, system ROM, drive firmware, and operating-system drivers using a supported sequence. Check the HPE compatibility matrix for the installed operating system, controller generation, drive firmware, and Smart Storage Administrator version. Avoid changing firmware during an unprotected or degraded array state. Verdict: Proper management and firmware discipline are essential, because a capable controller still needs a supported configuration.

What should you verify before buying or upgrading?

Controller cache, battery or flash-backed protection, and cabling

Confirm whether the exact controller includes protected write cache, and identify whether protection uses a battery-backed or flash-backed design. Also verify the correct internal cables, connectors, and backplane wiring. A controller that fits the server physically may still be unusable without the right cable kit or cache module.

Required SAS licenses, cables, and drive-backplane hardware

Review the DL360 Gen10 configuration for drive-bay count, backplane type, SAS licensing requirements, and supported drive carriers. Some features or RAID modes may require licensing or a specific controller family. Match the controller's internal ports and lanes to the number of bays you intend to populate rather than assuming one connector supports every bay.

Migration, replacement, and support considerations

Before replacing a controller, document the array layout, firmware versions, logical-drive settings, and backup status. Smart Array metadata can often support controller replacement within a compatible family, but migration is not a substitute for a tested backup. Check Hewlett Packard Enterprise documentation and support coverage for refurbished or discontinued parts, especially when buying second-hand hardware. Verdict: Verify the complete storage bundle, support status, and recovery plan before committing to any controller.

For the lowest-cost SATA operating-system mirror, the S100i SR Gen10 is the right choice. For virtualization, databases, and demanding mixed workloads, the P408i-a SR Gen10 is best because it combines dedicated RAID processing with protected cache. For dense internal arrays and maximum drive flexibility, the P816i-a SR Gen10 is the better fit. The P408i-a is the overall winner for most business-critical DL360 Gen10 deployments, while the E208i models suit moderate SAS or SATA configurations. Before buying, match the controller to the backplane, cables, drive count, RAID level, and cache requirements, then confirm the complete HPE support matrix.