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Architecture
This subsystem series offers a performance upgrade to the separate-bus, dual-ASIC design proven on Caen’s earlier RAID models. The series is specialized for flexible resource utilization to manage various-size IOs, random, or sequential access that requires high-speed throughput. The dual PCI bus design virtually eliminates all imminent bottlenecks on IO traffic, providing sufficient throughput for a wide range of applications on Disk-to-Disk Backup, cable CCTV storage, video on demand (VOD), SCSI-based PCs, single-user workstations, Windows NT/2000/XP, Linux, or Unix-based servers.

Firmware Capabilities
Numerous firmware options have been designed to achieve the highest level of data availability and performance. In addition to the full-featured RAID and recovery functionality, firmware is able to manage possible causes of data loss, even errors not directly related to RAID.

Automatic disk scanning can be carried out on a preset schedule to prevent parity damage due to the occurrence of block errors across multiple drives. Even if this happens, firmware is able to salvage most data by skipping those unrepairable data blocks.

Array capacity can be expanded online by adding drives or replacing the original drives with drives of larger capacity. Availability features include:
 Dedicated and global spare drives
 Hot-swappable drives, duplex support
 Remote and real-time monitoring
 SMART related functions

Firmware operation is optimized with advanced algorithms capable of intelligent read-ahead, multithreaded, predictive read-ahead, optimized sorted and group writes.

Manageability
The Java-based RAIDWatch GUI manager provides easy-to-use interfaces, is rich in configuration options, and allows users to remotely manage their storage system over a network. Event Monitor and Notification Processing Center (NPC) submodules provide system managers the freedom of real-time monitoring with a variety of notification methods.

Enclosure
The subsystem is designed for operation with no single point of failure. Its modular and dual-redundant design minimizes the time for maintenance and service. Up to 7 JBODs can be cascaded with a RAID unit to scale the capacity up to several terabytes (TB).

The included Loop resiliency circuits provide dual drive loops consisting of 16 drives in either the RAID or JBOD units. The JBOD models come with single or dual SES modules. Once a JBOD's drive loops are connected with a RAID unit, its status will be automatically collected and shown via the web-based GUI.

SAN Features
Capacity is made available in a SAN through LUN Filtering, a centralized access management capability. Up to 1024 filtering entries are supported and multiple entries can be mapped to each logical partition of logical configurations. Various related functions, such as host port auto-identification, filter type selection, entry naming, and access mode configuration make shared storage an easier task.

SPECIFICATIONS
Enclosure type
 Single or dual RAID subsystem, JBOD in 3U, 19" rack enclosure interfaces
 Two 2Gb/s host interfaces supporting point-to-point, FC-AL, and switched fabric
 2Gb/s single Dual-loop of 16 drives per enclosure
 10/100BaseT for web-based management
 RS-232C serial port

Configuration
 Single or dual-active RAID with 16 drives; or 16 drives with FC-AL attachment to shared storage

RAID Controller
 64-bit processor w/ 256KB L2 cache
 Proprietary ASICs w/ hardware XOR engine
 Up to 1GB SDRAM (battery included with dual-active RAID models)
 Memory/RAM bus bandwidth:1066MB/s Management
 Firmware-embedded Java-based GUI RAID manager over out-of-band connection featuring global manageability; real-time event notification and monitoring
 Firmware-embedded manager via RS-232C port

Fault Detection, Monitoring, and Recovery
 S.E.S. enclosure device monitoring
 RAID Controller self-diagnostics
 Bad Block Handling
 SMART support: clone failing drive with spare or replace it online, reaction schemes configurable
 Clustering support
 Parity background checks and corrections

SAN Management
 LUN Masking access control over terminal emulation or GUI manager, configurable filter entry variables
 Up to 1024 LUNs supported

Management
 Firmware-embedded Java-based GUI RAID manager
 Centralized management of multiple arrays over in-band or Ethernet
 Real-time event notification over Email, LAN broadcast, or SNMP traps
 Auto on-lining of cascaded enclosures
 SES modules on JBODs
 SNMP 2.0 MIBs with get and set commands
 Firmware-embedded utility via LCD keypad or RS-232C port

Maintenance & Availability
 Firmware rolling upgrade on redundant RAID controllers
 Synchronized cache over
 R2A2: over shared drive loops
 R2A2-A: over dedicated communications loops
 Li-ion battery support, comes standard with R2A2/R2A2-A
 Immediate array availability
 Drive roaming, array configuration on drives

Auto Switch Cache Policy and Auto Shutdown
When a RAID controller detects conditions exceeding preset thresholds, the following actions will be exerted to protect the hardware:
      1. Automatically flush cached data and switch the array's caching mode from write-back to write-through
      2. Commence an auto shutdown
Environmental thresholds associated with the auto-shutdown feature are user-configurable. Caching mode changes back to write-back once normal condition is restored.

Components
 Power supply 2 redundant hot-swappable power supplies w/ PFC
 Input 90 to 260VAC, 47 to 63Hz
 DC output 2V/32A, 38A peak; 5V/25A, 3.3V/20A; 460W
 Cooling fan 4 redundant cooling fans in separate modules; each capable of 61CFM at 3600rpm
 3U RAID enclosure or JBOD
 Single or dual redundant RAID controllers
 16 drive trays
 Dual redundant power supplies
 2 hot-swappable fan modules
 2 hot-swappable expansion port modules

Drive Interface
 3.5", 1" high disk drives
 16 hot-swappable drive trays
 Automatic bad sector reassignment
 Drive hot-swappable via SCA-II connectors
 Dual channels across 16 drives within each enclosure

Host Interface
 Auto-negotiate FC-AL, point-to-point, and switched fabric
 Concurrent I/O commands
 Tagged Command queuing up to 256
 Variable stripe size per logical drive
 Optimization setting for random or sequential I/Os

Physical/ Electrical
Interfaces 2Gbit Fibre SFP ports, LAN port, serial port
Input Voltage +90V ~ +260V AC, Auto-switching
Power Consumption 140W w/o drives
Operating Temperature 0 to 40 C
Relative Humidity 10-95%, non-condensing
Altitude Sea level to 10,000 ft
Warranty 3 years for controller & power supply

Dimensions
Chassis dimensions: 131H x 446.2W x 500D mm
(w/ protrusions): 131H x 485W x 532D mm
Package dimensions: 476H x 592W x 695D mm

System weight (w/o drives)
Net weight: 20kg
Gross weight: 32kg

Drive type
3.5" Low profile 1" pitch SCA

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