Adaptec RAID 8805

Adaptec RAID 8805: A Comprehensive Overview

The Adaptec RAID 8805 is a high-performance, low‑profile storage controller designed for demanding enterprise environments. It delivers robust data protection and exceptional throughput through its eight internal SAS/SATA ports, PCI Express Gen3 x8 interface, and integrated PMC PM8063 processor.

Key Design Features

Low‑Profile Form Factor

The controller is engineered in a full-height (low-profile) design, allowing it to fit into compact server chassis without compromising airflow or space. This makes the 8805 ideal for blade servers and other space-constrained deployments.

PCI Express Gen3 x8 Interface

With a PCIe 3.0 x8 host interface, the RAID 8805 offers up to 12 Gb/s of raw bandwidth per lane, translating into high aggregate throughput for multiple drives operating concurrently.

Integrated PMC PM8063 Processor

The controller’s onboard PMC PM8063 processor handles all RAID calculations and management tasks, freeing the host CPU from these duties. This results in lower latency and higher overall system performance.

Port Configuration and Connectivity

Internal Mini‑SAS Connections

The 8805 features two internal mini‑SAS (SFF‑8643) ports, each capable of connecting up to eight SAS or SATA drives. This allows for a total of 256 supported devices across the controller.

External Connectivity Options

While primarily an internal solution, the 8805 can be paired with external adapters that expose its eight ports via standard SAS/SATA cables, providing flexibility for mixed storage environments.

Supported RAID Levels and Data Protection

• RAID 0 – Striping for maximum performance.
• RAID 1 – Mirroring for fault tolerance.
• RAID 5 – Parity striping with single parity drive.
• RAID 6 – Dual parity for double-drive failure protection.
• RAID 10 – Striping of mirrored pairs.
• RAID 50 – Striping across multiple RAID‑5 sets.
• RAID 60 – Striping across multiple RAID‑6 sets.
• RAID 1E – Enhanced mirroring with additional parity.

The controller’s firmware supports dynamic reconfiguration, allowing administrators to change RAID levels on the fly without data loss in many scenarios.

Memory and Cache Architecture

The 8805 is equipped with 1 GB of internal DDR3 cache memory, which buffers I/O operations and reduces latency. This cache works in tandem with the controller’s firmware to provide fast, reliable access to data across all connected drives.

Reliability Metrics

The Adaptec RAID 8805 boasts an impressive Mean Time Between Failures (MTBF) of 645,612 hours. This metric reflects the controller’s durability and suitability for mission-critical workloads where uptime is paramount.

Supported Disk Interfaces

• SAS (Serial Attached SCSI) – High-speed, enterprise-grade drives.
• SATA (Serial ATA) – Cost-effective storage options.

The dual-interface capability ensures compatibility with a wide range of existing and future storage media.

Installation and Compatibility

Designed for MD2 form factor, the RAID 8805 can be installed in standard server motherboards that support full-height PCIe slots. Its low-profile design also makes it compatible with many blade and rack‑mount systems.

Operating System Support

The controller is supported by major operating systems, including Windows Server, Linux distributions (Red Hat Enterprise Linux, SUSE, Ubuntu), and VMware ESXi. Adaptec provides comprehensive drivers and management utilities for each platform.

Management Tools and Firmware

Adaptec supplies a suite of software tools that enable administrators to:

• Configure RAID arrays via BIOS or operating system utilities.
• Monitor drive health, performance metrics, and error logs.
• Update firmware for enhanced features and bug fixes.

The controller’s firmware is designed for ease of use while maintaining advanced capabilities such as hot‑plug support and automatic rebuilds.

Performance Highlights

• SAS 12 Gb/s transfer rate per port ensures high throughput for demanding workloads.
• The controller’s PCIe Gen3 x8 bandwidth supports simultaneous data streams from multiple drives, reducing bottlenecks.
• Integrated cache and processor reduce latency, delivering near‑real-time access to critical data sets.

Conclusion

The Adaptec RAID 8805 stands out as a versatile, high‑performance storage controller that blends low-profile design with enterprise-grade features. Its extensive port configuration, robust RAID options, and proven reliability make it an excellent choice for organizations seeking scalable, fault-tolerant storage solutions.