HP SAS DD400B8541 400-GB 10K 3.5 DP SAS 10-Pack — main product image

HP SAS DD400B8541 400-GB 10K 3.5 DP SAS 10-Pack

HP SAS DD400B8541 400-GB 10K 3.5 DP SAS 10-Pack

Name: HP SAS DD400B8541 400-GB 10K 3.5 DP SAS 10-Pack
Brand: HP
SKU: SAS

Ten 400GB 10K SAS drives in one pack — enterprise-grade IOPS and dual-path redundancy built for storage arrays that cannot afford downtime.

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Overview

This HP 10-pack consists of ten 400GB 3.5" Dual-Port SAS hard drives spinning at 10,000 RPM. The 10K RPM figure is the performance differentiator here — it reduces mean rotational latency to ~3ms and delivers random IOPS in the 130–170 range, positioning these drives squarely in the enterprise transactional storage tier. The "DP" designation (Dual Port SAS) is equally important: each drive exposes two independent SAS ports, enabling Multipath I/O configurations where redundant controllers or SAS expanders maintain access to the drive even if one path fails entirely. This is a hardware-level resilience feature that SATA and consumer-grade SAS drives do not provide, and it is the expected specification for any production server deployment where downtime has a cost.

These drives are purpose-built for HP ProLiant server environments — storage arrays, RAID-attached storage, and direct-attached configurations using HP Smart Array controllers or compatible SAS HBAs. The 10-pack format supports building a complete RAID 10 or RAID 6 array in a single procurement, making it appropriate for administrators refreshing or expanding an existing HP storage infrastructure. The 400GB capacity per drive is modest by current standards — this is not a solution for bulk media storage or large data lake deployments. Its value proposition is IOPS density, dual-path redundancy, and compatibility with the extensive installed base of HP enterprise platforms that were qualified against this drive family. Organizations operating those environments and needing reliable drive replacements or array expansion will find this pack delivers predictable, spec-consistent performance.

Specifications

Capacity

400 GB per drive

Rotational Speed

10,000 RPM

Interface

Dual Port SAS (DP SAS)

Form Factor

3.5 inch LFF

Quantity

10 drives

Total Raw Capacity

4 TB (10 x 400 GB)

Brand

Pros & Cons

👍 Pros

10K RPM rotational speed delivers average seek times of 3.5–4.5ms and ~130–170 random IOPS — meaningfully faster than 7.2K SAS alternatives in latency-sensitive workloads.
Dual-Port SAS enables MPIO configurations, providing path-level redundancy without requiring drive replacement if a single HBA or SAS path fails.
3.5" LFF form factor is compatible with a broad base of existing enterprise server chassis and backplanes that cannot accept 2.5" SFF drives without adapters.
10-pack quantity supports immediate RAID array builds without ordering in multiple batches, reducing configuration time in deployment scenarios.
400GB capacity per drive is sufficient for OLTP database volumes, log storage, and virtual machine datastores in environments where capacity per drive is secondary to IOPS density.

👎 Cons

400GB capacity per drive is below the 1–4TB range now standard for enterprise nearline SAS HDDs; total raw array capacity of 4TB (10 drives) is limited relative to modern storage requirements.
Spinning platter technology has intrinsically higher failure rates and longer rebuild times than SSD alternatives — RAID rebuilds on 10K SAS drives at 400GB can take hours, expanding the vulnerability window.
10K SAS drives consume more power per IOPS than SATA SSDs; in a dense array, power and cooling overhead is measurably higher than a comparable SSD deployment.
These drives are HP-targeted; compatibility outside of HP ProLiant and qualified HP Smart Array controller configurations may require verification and is not guaranteed.
No stated firmware version or drive model sub-revision is provided, which can complicate compatibility verification against specific HP server/controller qualification matrices.

Frequently Asked Questions

What does 10K RPM actually mean for this drive's performance profile versus 7.2K alternatives?

10,000 RPM reduces rotational latency to roughly 3ms versus 4.2ms on a 7,200 RPM drive. Combined with the 3.5" platter diameter, this translates to average seek times in the 3.5–4.5ms range and random IOPS figures typically in the 130–170 IOPS range — roughly 30–40% higher than 7.2K SAS equivalents. For transaction-heavy workloads like OLTP databases, this latency reduction is measurable.

What does "DP SAS" (Dual Port SAS) mean and why does it matter for server deployments?

Dual Port SAS means the drive exposes two independent SAS ports, each capable of connecting to a separate SAS controller or HBA. This enables multipath I/O (MPIO) configurations where both paths to the drive are active simultaneously — if one path or controller fails, I/O continues on the surviving path without downtime or data loss. In any redundancy-critical server environment, dual-port is the correct specification.

What server backplane and HBA do these drives require?

These 3.5" SAS drives require a SAS backplane with 3.5" LFF (Large Form Factor) bays and a SAS HBA or RAID controller with SAS support — not SATA-only controllers. Common compatible platforms include HP ProLiant DL/ML servers with HP Smart Array controllers and any system using LSI/Broadcom SAS HBAs. Verify your backplane supports SFF-8482 or SFF-8087/8088 SAS connectors.

How does 400GB SAS capacity compare to modern SSDs, and where does it still make sense?

400GB is modest by current storage standards, but these drives are optimized for IOPS density per rack unit rather than raw capacity. They remain relevant in legacy HP enterprise environments where the existing storage architecture, RAID configuration, and controller ecosystem are already in place and the cost of migrating to SSD is not justified by the workload profile.

Can these drives be used in a RAID array, and what RAID levels are appropriate?

Yes — dual-port SAS drives are designed for RAID deployment. With 10 drives in this pack, common configurations include RAID 10 (5 mirrored pairs, ~2TB usable with full redundancy), RAID 6 (8+2 parity, ~3.2TB usable with two-drive fault tolerance), or RAID 50/60 for larger arrays. RAID level selection should be driven by the application's IOPS, capacity, and redundancy requirements.