XDAS SCSI

Aberdeen XDAS SCSI 4U subsystems provides unprecedented performance through full utilization of its 640MB/s host bandwidth with the computing power managing a massive capacity of 24 SATA disk drives. The subsystem handles the 12TB of raw capacity with ease, using the dual PCI-X, custom-built ASIC266 architecture that is renowned for its ample margins, flexible load-balancing, and multi-pathing algorithms. Boasting a 2GB internal bandwidth, the dedicated ASIC architecture makes the subsystem ideal for a wide range of applications such as data archiving, backup and restore, near-line DAS, and any environment where cost-effective, mass storage is required.

Reliability

In addition to RAID protection against drive failure, the subsystem has ingenious means to deal with other challenges that may jeopardize data integrity. For example, hard disk drives wear down over time and drives may arrive from the manufacturer with inherent defects. Media Scan and Task Scheduler are among the DrvSmart utilities designed for mending these problems.

The subsystem is also equipped with error containment algorithms, known as the SysSmart functions. If a critical component fails, e.g., a battery module, the subsystem automatically disables write-back caching and assumes the conservative write-through mode. If the fault condition persists for an extended period of time, the subsystem enters an idle state. All of these precautions help ensure safe operation and distribution of data.

Availability

The XDAS 4U SCSI is powered by field-proven technologies that ensure data protection and performance to meet your various storage needs. Your data is secured by sophisticated, redundant components and advanced firmware developed through a decade of experience in RAID technology design. In addition to the choice of RAID levels, 0, 1(0+1), 3, 5, 6, 10, 30, and 50, 60, the subsystem protects your data with various high-availability algorithms ranging from predictive checking and self-healing rebuilds to system self-diagnostics.
To ensure a high level of system availability, critical components such as disk drives, power supplies, and cooling fans are all redundant and hot-swappable.

Modules are integrated with the passive backplane via board-to-board connectors to eliminate points of failure. Assisted by GUI management software, system administrators can constantly monitor the operating status of all components through a console locally or
remotely situated. The subsystem guarantees data integrity with selected, high MTBF components; a modular, fault-tolerant design; and a complete set of environmental monitoring and fault protection capabilities built in the firmware.

Serviceability

All critical modules are housed in separate, retrievable canisters. In the event of component failure, a hard disk drive, power supply, battery module, RAID controller, or cooling fan can be replaced within seconds. The modules are closely monitored using self-diagnostic features and the help of runtime utilities such as RAIDWatch. Spring screws, securing latches, and key-locks all provide easier access to the modules.

A variety of configuration and monitoring methods are available, either locally via the LCD keypad panel and the text-mode RS-232C terminal, or remotely through the Java-based GUI manager. All faulty conditions,including RAID configuration events, module failure, voltage and temperature readings, are instantly reported. A system administrator can select from the following notification methods to receive reports when away from the installation site: LAN broadcast, SNMP traps, email, fax, SMS, ICQ, and MSN Messenger. Even the notification utility can be installed redundantly on two different machines to avoid the chance of blind time.

Host Interface	Two (2) SCSI-320 host channels (Dual-Stacked VHDCIs) Tagged command queuing up to 256 Host-side ordered tag support
Drive Interface	Twenty-four (24) 3.0Gbps SAS/SATA-II, hot-swappable drive trays Accommodates 1-inch pitch, 3.5-inch SATA (3Gbps) disk drives Native Command Queuing (NCQ) support Automatic bad-sector reassignment Dedicated bandwidth to each connected drive
Controller	Hardware XOR engine by dedicated ASIC266 chipset 600MHz RISC CPU, 512KB L2 cache
Form Factor	4U Rack-mount
RAID functionality	Multiple arrays configurable with dedicated or global hot spare drives RAID levels: RAID0, 1 (0+1), 3, 5, 6, 10, 30, 50, 60, and NRAID Online expansion by: - Adding new drives - Copying and replacing drives with drives of larger capacity Automatic background rebuild Configurable stripe size and write policy per array Intelligent drive handling: - In degraded mode: skips irreparable blocks to continue rebuild - In normal operation: data-block verification and repair
Management	Firmware-embedded utility via LCD keypad or RS-232C terminal 10/100BaseT Ethernet for out-of-band management Two (2) COM ports for local access to firmware-embedded utility and UPS connectivity Telnet access via onboard Ethernet port Java-based RAIDWatch® Manager Graphical user interface Local/remote management; in-band or out-of-band via TCP/IP Centralized management of multiple subsystems from one management computer A variety of event notification methods via the Configuration Client sub-module: email, fax, LAN broadcast, SNMP traps, MSN messenger, ICQ, and SMS short messages Secure link over SSL
LED Indicators	Module status: - Two (2) per drive tray - Four (4) per controller module - One (1) per power supply unit - One (1) per BBU module - Two (2) per cooling module
System Components	XDAS SCSI 4U x04 (A24U-G2421) One (1) RAID controller module One (1) 512 MB DIMM module Three (3) 405W power supply units Two (2) dual-speed cooling modules Twenty-four (24), hot-swappable drive trays One (1) optional Li-Ion battery backup unit (BBU), life expectancy and charge level aware
Dimensions (without chassis ears/protrusions)	445mm (W) x 174.4mm (H) x 498mm (D)
Weight	Net weight:36.5kg Gross weight: 39.6kg

The IOSmart technologies consist of specific functions and configuration options that control various I/O characteristics in order to meet the rapidly increasing requirements of today's applications. These functions include adaptable stripe size; write policy; optimizations modes; Guaranteed Latency I/O; and automatically adjusted, multi-threaded, predictive read-ahead, sorted, or group writes.

DrvSmart is comprised of fault-preventive algorithms that ensure data integrity when hard drive imperfections occur. These mechanisms correct minor defects, increase reaction time, allow more time to prepare a rebuild, and help minimize performance impact. DrvSmart functions include Media Scan and Task Scheduler, hot-spare, drive roaming, SMART and manual cloning options, and more.

SysSmart combines enclosure monitoring and firmware management capabilities designed to minimize the chance of downtime caused by hardware failures. With SysSmart, Infortrend's subsystems are smartly managed and guarded against extreme operating conditions. SysSmart functions include the event-triggered, adaptive write policy, auto-shutdown, dual-speed fan control, and the various monitoring utilities and approaches included in the powerful RAIDWatch Manager software.

 

Aberdeen Reliability Aberdeen brings an industry leading  5-year warranty to the table with every fully configured AberNAS rackmount server. Our custom configured rackmounts and along with our pre-configured Stirling line of servers and AberNAS network appliances come with a  5-year warranty standard unlike of some other companies' 1 or 3 year warranties. Take advantage of the speed, storage and security of the AberNAS by Aberdeen.

Aberdeen C.A.R.E.S. Aberdeen offers a 30-day trial assessment program on completely configured servers. We are so confident that once you try one of our custom configured rackmount servers you will not only be completely satisfied with the evaluation unit but will choose Aberdeen to fulfill all your future rackmount server needs.