797089-002 HPE 450GB 12GBPS 15K RPM 2.5 Inch SAS SFF HDD

Key category attributes

• Form factor: 2.5-inch small form factor (SFF) — saves rack space and allows higher drive density in arrays.
• Spindle speed: 15,000 RPM — optimized for low-latency workloads and fast random access.
• Interface: 12Gb/s SAS (Serial Attached SCSI) dual-port — supports high throughput and multipath connectivity for resilience.
• Capacity: 450GB — tuned for balance between capacity and performance in transactional workloads.
• Target workloads: OLTP databases, virtualization hosts, high-transaction file systems, metadata servers, and tier-0 / tier-1 applications requiring predictable IOPS.

Performance characteristics

• Random I/O: High IOPS for small block sizes (4K–8K), which is essential for database and virtual machine workloads.
• Sequential throughput: Optimized for sustained read/write throughput when larger block transfers occur, though spinning disks excel less than flash on sequential peak throughput.
• Latency: Lower average latency than lower-RPM drives due to 15K spindle speed — beneficial for synchronous operations and high-frequency transactions.
• Dual-port SAS: Enables multipathing and concurrent access from dual controllers or hosts, reducing failover time and improving availability.

Reliability and endurance considerations

This category places a premium on endurance and predictable service life. Manufacturers specify enterprise-grade vibration tolerance, advanced error correction algorithms, and rigorous burn-in testing. Buyers should evaluate:

• MTBF and AFR: Common enterprise-grade values that provide an estimate of expected drive longevity.
• Workload rating: Some enterprise drives publish drive writes per day or workload optimized rating to reflect intended use (e.g., mixed-use or read-intensive).
• Power-loss protection: Features such as cache protection and write integrity mechanisms that guard data in flight during unexpected power events.

Compatibility, form factor, and integration

Compatibility is central to the category because drives like the 797089-002 must interoperate with HPE MSA arrays and typical enterprise servers. Important compatibility aspects include drive firmware, tray/ caddy fit, backplane compatibility, and SAS controller support.

Form factor and tray considerations

• SFF 2.5-inch: Requires compatible 2.5" drive bay or caddy; higher density packing per chassis is a benefit.
• Carrier/caddy: HPE often uses proprietary carriers; confirm SKU compatibility or that the drive is shipped with an adapter if needed.
• Hot-swap support: Enterprise drives are typically hot-swappable for maintenance without downtime.

Interface and controller support

• 12Gb/s SAS: Backward compatible with 6Gb/s and 3Gb/s SAS controllers but will operate at the lower negotiated link speed.
• Dual-port: Facilitates multipath access; ensure host bus adapters and storage controllers support multipath I/O (MPIO) and proper path failover configurations.
• Firmware: Drive firmware versions might be validated for certain controller families. For arrays, always check HPE compatibility matrices to avoid unsupported combinations.

Comparisons within the category

Shoppers often compare 15K SAS SFF drives to other enterprise drive options. Useful comparison axes include performance (IOPS & latency), capacity per spindle, power consumption, and cost per GB.

15K SAS vs. 10K SAS

• Performance: 15K generally provides higher IOPS and lower access latency compared to 10K, making it more suitable for intensely transactional workloads.
• Power & heat: 15K drives typically consume more power and produce more heat; cooling and power budgets must be considered.
• Cost: Cost per GB for 15K is higher due to lower capacity and higher manufacturing complexity.

15K SAS vs. Enterprise SSD

• Latency & IOPS: SSDs outperform spinning media by wide margins, but 15K SAS still offers competitive cost-per-IOP for predictable, mixed-use workloads in some architectures when balanced with caching.
• Endurance: SSDs have write endurance limits; spinning media avoids write-cycle limits but is mechanical and susceptible to different failure modes.
• Cost trade-offs: SSDs deliver superior performance but at higher cost per GB; 15K SAS can be used in combination with SSDs in hybrid tiers to optimize TCO.

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