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Comet SATA 12

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Overview
The Comet SATA 12 single RAID controller subsystem series comes in a cableless, backplanebased, high-density 2U enclosure.

The Comet subsystem combines either 2Gbps Fibre or Ultra4 SCSI host channels with 12 SATA drives in a storage subsystem. The system design provides users massive storage capacity with SATA benefits such as high performance and full bandwidth to each connected device, in a safe subsystem environment where a high level of data availability is assured.

The RAID controller embedded in the Comet RAID subsystem ensures unprecedented data security for ATA RAID.

Features
 Two 2Gbps Fibre host channels; Transfer rate up to 200MB/sec for each OR two SCSI-160 host channels
 Full-featured hardware RAID architecture
 Online array expansion by adding drives or replacing with larger drives
 Tunable array stripe size and optimization schemes
 Multiple Logical Drive configurations, each with a different RAID level
 Auto detection, auto rebuild, hot-spare, and hot-swappable
 LUN Filtering-centralized access management in SAN by WWN
 Up to 1024 LUNs for host
 Auto system shutdown and cache flush on critical conditions
 Intelligent Drive Management for managing bad blocks during rebuild and the manual Media Scan function for sector repair
 Transparent resetting of hung HDDs
 Up to 64TB maximum capacity per logical drive
 RAIDWatch: Browser-based GUI manager on all major platforms

Architecture
Running on architecture used by the most demanding applications, the subsystem is equipped with intelligent algorithms capable of bridging the point-to-point bandwidth of SATA drives with high speed host channels. Its separate-bus backbone is built around the dedicated XOR engines capable of fast parity calculation and I/O turnarounds. The distribution of data can be optimized with configurable array settings and the free association between individual arrays and different optimization modes.

High Performance
Featuring a 64-bit 133MHz memory bus, the unparalleled bandwidth makes the subsystem's high data throughput more than sufficient for small-to-medium sized servers or workstations. Data can be distributed at a burst rate of up to 1066MB/sec. The dual PCI bus design virtually eliminates all imminent bottlenecks on IO traffic, providing sufficient throughput for a wide range of applications on SCSI-based PCs, single-user workstations, NT, Linux, or Unix-based servers. These applications include disk-to-disk backup, Video on Demand, CCTV, and stream editing.

Intelligent Drive Handling
Media Scan is an innovative intelligent drive management function that can be used for data retrieval from the occurrence of bad sectors on hard drives. If two bad blocks occur on two member drives of an array, the integrity of the stored data will be endangered. Intelligent drive management capabilities can be used to retrieve data from the damaged sectors. Media Scan is able to handle low quality drives in both the degraded mode and during the rebuild process. Other intelligent drive handling features, which provide further data security, include the transparent resetting of hung hard drives, power-failure management and bad drive handling during LD expansion.

RAID Controller
 State-of-the-art 400MHz RISC
 processor with 256KB embedded L2 cache
 Proprietary ASIC133 hardware XOR engines with ECC support
 Standard 128MB-1GB cache memory in one SODIMM
 Optional battery backup
 Voltage and temperature self-monitoring
 One Ethernet port for out-of-band management
 32KB NVRAM with RTC (Real Time Clock)
 Audible alarm

RAID Operation
 RAID level 0, 1, 1 (0+1), 3, 5, 10, 30,
 50, and JBOD
 Multiple array configuration
 Hot-spare drive operation
 Hot-swappable drives
 Automatic background rebuild
 Online capacity expansion
 Intelligent drive management

System Components
 Redundant, hot-swappable components, designed for no single point of failure
 2U RAID enclosure or JBOD
 Single RAID controller
 12 drive trays
 Dual redundant power supplies
 2 hot-swappable fan modules

Host Interfaces
 Two 2Gbps Fibre Channels OR Two SCSI-160 Channels
 SAN ready
 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

Drive Interface
 Serial ATA 1.5Gbps via backplane
 Twelve (12) 1-inch trays
 Dongle board for parallel ATA drives
 3.5", 1" high 1.5Gbps SATA disk drives
 12 hot-swappable drive trays
 Automatic bad sector reassignment
 Drive hot-swappable via SCA-II connectors
 Dedicated bandwidth to each connected drive

Enclosure
 Two 350W power supplies w/ PFC
 Three cooling fan modules
 Fan, power, and disk drives monitoring by LED indicators, audible alarm, and manager software

External Connections
 Two SFP ports for dual channel optical fiber connection OR two mini-SCSI ports for SCSI-160 connection
 One RS-232C (Audio Jack) serial port (38400, n, 8,1)
 One RJ-45 Ethernet port

Management
 LCD keypad on a foldable forearm handle
 Firmware-embedded manager via RS-232C (Audio Jack, platform independent)
 Browser-based Java GUI over in-band connection or the Ethernet port
 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
 Host-side SES emulation with pass-through to back-end SES emulation
 SNMP 2.0 MIBs with get and set commands

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

Maintenance & Availability
 Optional Li-ion battery support
 Immediate array availability
 Drive roaming, array configuration on drives
 Controller voltage and temperature self-diagnostics

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.

Requirements
Power: 100~240VAC+10% full range; 6A / 3A at 90V / 230V, 47Hz / 63Hz
Relative Humidity: 5~95% non-condensing
Operating Temperature: 0~40 C

Interfaces
 2 SFP sockets using a short-wavelength adapter
 One audio jack for RS-232C serial port (38400, n, 8, 1)
 One RJ-45 Ethernet port

Power supply
2 redundant, hot-swappable power supplies with PFC
Input: 90~260VAC, 47~63Hz
Output: +5V, 25A max.; +12V, 24A max.; +3.3V, 20A max.; 350watts capacity

Cooling fan
3 cooling fans in three separate modules:
Operating temperature: 5 to 40°C
Non-operating temperature: -20 to 60°C
Relative humidity: 10~95%, non-condensing
Operating altitude: sea level to 10,000ft

Dimensions
2U 19-inch rackmount chassis
Chassis Physical: 446.2W x 486.5D x 88H mm
SI/ODM controller board: 255L x 142W mm

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