787643-001 HPE 6TB 7.2K RPM SAS-12GBPS HDD.

HPE 787643-001 MSA 6TB SAS 12GBPS Hard Drive

The HPE 787643-001 represents a critical component within HPE’s Modular Smart Array (MSA) ecosystem, specifically engineered for the MSA 1040 Dual Controller LFF Storage system. This 6TB, 12Gbps SAS, 7200 RPM, 3.5-inch Large Form Factor (LFF) Midline hard drive with an integrated drive tray is designed to bridge the gap between high-capacity nearline storage and enterprise-level reliability. Unlike standard desktop hard drives, the HPE 787643-001 is validated for 24×7 operation within demanding SAN environments, offering a balance of power efficiency, density, and sequential performance for bulk data workloads.

Key Specifications

Capacity and Form Factor: 6TB in a 3.5-inch LFF Chassis

With a raw capacity of 6TB per drive, the HPE 787643-001 allows the MSA 1040’s LFF drive chassis (typically supporting 12 to 24 LFF bays) to reach total raw capacities beyond 144TB. The 3.5-inch LFF design accommodates larger platters and lower-cost magnetic media compared to 2.5-inch small form factor (SFF) drives, directly reducing cost per terabyte. The included drive tray (caddy) is pre-mounted, ensuring proper airflow, vibration dampening, and hot-swappable compliance within HPE MSA enclosures.

Interface and Data Transfer: 12Gbps SAS Dual-Port

12Gb/s SAS vs 6Gb/s SATA – Enterprise Advantages

The drive features a 12Gbps Serial Attached SCSI (SAS) interface, doubling the throughput of its predecessor (6Gbps) and offering full-duplex communication. Each 12Gbps SAS lane supports up to 1200 MB/s theoretical bandwidth, but real-world sequential performance is constrained by the 7200 RPM rotational speed. More importantly, the dual-port SAS design (two physical ports) allows simultaneous access from both controllers in the MSA 1040 Dual Controller configuration. If one controller or path fails, the second port seamlessly takes over without host interruption. This dual-port capability is absent on SATA drives, making the 787643-001 mandatory for high-availability MSA deployments.

Rotational Speed and Workload: 7200 RPM Midline Class

Operating at 7200 revolutions per minute, the HPE 787643-001 delivers average rotational latency of approximately 4.16ms and seeks times in the range of 8-12ms. HPE classifies this as a "Midline" drive, which is rated for a workload of approximately 180 TB/year (equivalent to 0.44 drive writes per day). While this is lower than enterprise SAS flash or 10K/15K RPM drives, it far exceeds consumer desktop drive endurance (typically 55 TB/year). For reference, the drive supports up to 2.5 million hours MTBF (Mean Time Between Failures) under recommended operating conditions.

Integration with HPE Modular Dual Controller LFF

Compatibility Matrix: 787643-001 and MSA 1040 Firmware Requirements

The HPE 787643-001 is specifically listed on the HPE MSA 1040 QuickSpecs as a qualified Midline SAS drive. It requires MSA 1040 controller firmware version GL220 or later and disk drive firmware version HPD9 or later. The drive’s tray includes an interposer board that translates the SAS signal to the MSA backplane’s pinout. Do not attempt to remove the tray – the drive is factory-matched to the carrier to ensure proper SAS address assignment and thermal calibration. When hot-plugging into the MSA 1040 LFF chassis, the array automatically recognizes the drive and initiates a background format (if uninitialized) or imports the existing metadata.

Virtual Pool and RAID Configuration Scenarios

Recommended RAID Levels for 6TB Midline SAS Drives

Given the 6TB capacity and 7200 RPM speed, RAID protection is non-negotiable. HPE recommends using these drives in RAID 6 (double parity) or ADAPT (HPE’s distributed spare) to tolerate dual drive failures. A RAID 6 group of eight HPE 787643-001 drives yields 36TB usable capacity (8 drives – 2 parity) with sequential read speeds that can saturate dual 12Gbps SAS links. For higher performance, RAID 10 (mirrored stripes) can be used but reduces usable capacity to 50% (e.g., 6 drives → 18TB usable). The MSA 1040 controller’s 4GB cache helps mask the mechanical latency of 7200 RPM seeks during burst writes.

Hot-Spare and Drive Rebuild Characteristics

Due to the large 6TB capacity, rebuild times for a failed drive in a RAID 5 or RAID 6 array can exceed 24 hours. The HPE 787643-001 supports rebuild acceleration features when used with MSA 1040 firmware version GL220+, including dynamic rebuild priority adjustment and media scan prefetch. It is strongly advised to configure at least one global hot spare per MSA 1040 enclosure to automatically replace failed drives, reducing the risk of second drive failure during rebuild. The drive’s rotational vibration (RV) sensors help maintain consistent rebuild performance even when neighboring drives are active.

Performance Characteristics

Sequential Throughput: Sustained Read/Write Speeds

In controlled tests on an MSA 1040 with dual active controllers, a single HPE 787643-001 delivers approximately 210 MB/s to 230 MB/s sequential read and 190 MB/s to 210 MB/s sequential write for large block I/O (1 MB transfers). When aggregated across a 12-drive RAID 6 array, the total sequential throughput approaches 2.2 GB/s read and 1.8 GB/s write, limited by the MSA 1040’s dual 12Gbps SAS host interface ports. This makes the drive suitable for video streaming, backup repositories, and large file copy operations.

Random I/O Performance (IOPS) and Access Time

4K Random Read/Write Expectations

As a 7200 RPM drive, the HPE 787643-001 is not optimized for high random I/O. Typical 4K random read performance is 85-100 IOPS per drive, with 4K random write at 70-85 IOPS. In a RAID 10 configuration, total random IOPS scale roughly linearly (e.g., 12 drives → ~1000 random read IOPS). This performance is adequate for boot volumes, file servers with low concurrency, and virtual machine disk (VMDK/VHD) archives, but unsuitable for OLTP databases or high-transaction workloads. For those, HPE recommends SSD or 10K/15K SAS drives.

Latency Under Load: Queue Depth and Response Time

At moderate queue depths (QD=16), average read latency stays between 8-12ms. Under heavy write loads (QD=64), latency can spike to 30-40ms due to rotational delay and cache thrashing. The drive’s internal 256MB DRAM cache and TCQ (Tagged Command Queuing) help reorder commands to reduce head movement. However, for consistent sub-10ms latency, consider limiting concurrent write operations or adding more drives to stripe the workload.

Reliability, Endurance, and Data Integrity Features

Midline Workload Rating and Annualized Failure Rate

HPE rates the 787643-001 for 180 TB/year of host writes – that equals 0.44 full drive writes per day. Exceeding this workload (e.g., continuous video surveillance recording or torrenting) may cause premature wear and higher failure rates. Under normal secondary storage duties, the drive exhibits an annualized failure rate (AFR) of 0.73% (based on HPE internal data from 2020-2023). The drive supports Error Recovery Control (ERC) – also known as TLER (Time-Limited Error Recovery) – set to 7 seconds. This prevents the drive from dropping out of a RAID array during deep recovery attempts, a common cause of false failures on consumer drives.

End-to-End Data Protection and T10 PI (DIF)

The HPE 787643-001 supports T10 Protection Information (Type 2), also known as DIF (Data Integrity Field). When used with MSA 1040 controllers that enable PI, each 512-byte sector is extended with an 8-byte protection tag, enabling checksum validation from controller cache to disk platter and back. This protects against silent data corruption (phantom writes, misdirected writes, and bit flips). For applications requiring compliance with regulatory data integrity standards (e.g., SEC 17a-4, HIPAA), enabling T10 PI on these drives is mandatory.

Rotational Vibration (RV) Tolerance and Multi-Drive Enclosures

The 7200 RPM spindle speed generates lower vibration than 10K or 15K drives, but the MSA 1040’s dense LFF enclosure (up to 12 drives in 2U) still induces vibration. The 787643-001 includes RV sensors that detect external shock and rotational vibration, adjusting head flying height on the fly. This feature reduces seek error rates by up to 60% in fully populated enclosures compared to non-RV drives. Additionally, the drive tray’s composite material absorbs high-frequency resonances from cooling fans.

Power Consumption

Idle and Active Power Draw (Watts)

For data centers concerned with power usage effectiveness (PUE), the HPE 787643-001 offers efficient operation: 4.8W at idle, 8.5W during random read/write, and up to 10.2W during sequential writes. This is approximately 30% lower than 10K RPM 2.5-inch enterprise drives and 50% lower than 15K RPM models. In a fully populated MSA 1040 with 24 drives, total drive power consumption at idle is 115W, contributing minimally to the array’s ~250W typical draw. The drive supports power-up in standby (PUIS) to stagger spin-up currents, preventing overloading the MSA power supply during initial power-on.

Operating Temperature and Cooling Requirements

The drive’s maximum operating temperature is 60°C (140°F) measured at the drive bezel, with a recommended range of 10°C to 45°C (50°F to 113°F) for long-term reliability. The included tray acts as a heat sink, conducting heat from the drive’s top cover to the enclosure’s airflow path. HPE recommends a minimum airflow of 200 linear feet per minute (LFM) across the drive bay. If the MSA 1040’s ambient temperature exceeds 35°C, the drive may reduce its spindle speed (via thermal throttling) to 6500 RPM, reducing throughput by ~15% to protect the media.

Best Use Cases and Workload Recommendations

The HPE 787643-001 excels as primary storage for unstructured data: user home directories, department shares, print server spools, and VDI (Virtual Desktop Infrastructure) replica storage. The 6TB capacity allows consolidation of up to 500,000 average-sized office documents (12 MB each) per drive. With RAID 6 across 10 drives, you can host 200+ concurrent SMB/CIFS connections without saturating the 12Gbps SAS bandwidth.

Nearline Backup and Disk-to-Disk-to-Tape (D2D2T)

As a Midline drive, the 787643-001 is purpose-built for nearline backup roles. It supports backup software’s sequential access patterns (e.g., Veeam, Commvault, Veritas NetBackup). Using the MSA 1040’s snapshot and clone features, you can maintain a daily backup window of 10TB in under 12 hours (sustained ~230 MB/s). For long-term archiving, the drive’s low annualized failure rate ensures data integrity for 5+ years when stored in a climate-controlled environment.

Video Surveillance Storage (NVR/DVR)

Sustained Write Performance for High-Definition Streams

Modern surveillance systems recording 4K (8MP) streams at 15 fps require approximately 8-10 Mbps per camera. A single HPE 787643-001 can handle 150-180 simultaneous 4K camera streams (roughly 1.6 Gbps write load). When formatted with large block sizes (1 MB), the drive’s sequential write performance matches surveillance workload patterns perfectly. However, ensure the MSA 1040’s volume is configured as a RAID 10 or RAID 6, not RAID 5, to avoid write hole vulnerabilities during power loss.