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Overview
The Comet SCSI 12S single RAID controller subsystem series
comes in a cableless, backplanebased, high-density 2U enclosure.
The Comet subsystem combines either 2Gbps Fibre or Ultra4
(Ultra320) 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.
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Features
 Two
SCSI-320 Host Channels; Transfer rate up to 320 MB/sec for each
channel
Two
SCSI-320 Drive Channels; each channel attached to six drives. Transfer
rate up to 160MB/sec for each channel
Multiple
Logical Drive configurations, each with a different RAID level
Auto
detection, auto rebuild, hot-spare, and hot-swappable
LUN
Filtering RAID-based and centralized access management in SAN
Intelligent
Drive Handling for managing bad blocks during rebuild and the manual
Media Scan function for data maintenance
Up
to 64TB per LD
Up
to 1GB SDRAM
Variable
rebuild priority to meet a variety of applications
RAIDWatch:
Browser-based GUI Manager on all major platforms
Auto-cache
flush and auto-switch caching mode
Auto-shutdown
when certain critical environmental thresholds are exceeded
Overview
Delivering unprecedented performance and reliability, the Comet
SCSI 12s RAID controller subsystems integrate Caen's highly acclaimed
SCSI-to-SCSI RAID controllers with a wide range of 12 hot-swappable,
high-performance, industry-standard SCSI-320 drives in a single,
uniquely designed, highly accessible storage enclosure that is able
to endure the extreme physical stresses placed on storage subsystems
today.
Featuring two SCSI-320 host channels, the embedded SCSI-320 controller
ensures superior performance, extreme reliability and exceptional
data availability in today's most data-intensive storage environments.
Equipped with three fully redundant, hot-swappable cooling fan
modules and two fully redundant, hot-swappable power supply units,
the uniquely designed 19-inch rack mountable enclosure has been
customized to perform in the most rigorous storage environments
where data availability is imperative.
The wireless modular design and the easy accessibility to all hot-swappable
active components including the drive trays, PSUs, and cooling FAN
modules simplify subsystem maintenance.
Advanced subsystem monitoring features include RAIDWatch, an advanced
multi-platform Java-based GUI, and the Notification Processing Center
(NPC), a RAIDWatch sub-module that ensure subsystem managers can
remain regularly informed about subsystem events through a variety
of communication devices including email, FAX, and pager.
Architecture
Running on architecture used by the most demanding applications,
the subsystem is capable of a high level of performance. Its 64-bit
separate-bus backbone is built around the dedicated XOR engines
running at twice the data bus speed. The calculation of parity and
distribution of data can be optimized with the free association
between individual logical arrays and different optimization modes.
High Performance
Featuring a 64-bit 133 MHz memory bus, the unparalleled bandwidth
makes the subsystem's high data throughput more than sufficient
for small to mid-sized servers or workstations. Data can be distributed
at the burst rate up to 1066MB/sec. The dual independent 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 Handling function
that can be used for data retrieval from degraded or damaged 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 management features, which provide further data
security, include the transparent resetting of hung hard drives,
power failure management and bad drive handling during LD expansion.
Specifications
RAID Controllers
State-of-the-art
400MHz RISC processor with 256KB embedded L2 cache
Proprietary
ASIC133 with XOR engine and ECC inside
Standard
128MB-1GB cache memory in one SDRAM with optional BBU
LCD
controller panel interface
System
Fan speed/Voltage/Temperature self-monitoring
One
RS-232C (Audio Jack) serial port for text mode management
One
10/100M Ethernet Port
32KB
NVRAM with RTC (Real Time Clock)
Beeper
Multiple
arrays configurable with dedicated or global hot spares
RAID
levels supported: RAID 0, 1 (0+1), 3, 5, 10, 30, 50, NRAID and JBOD
Online expansion by
1. Adding new drives
2. Copying and replacing drives with drives
of larger capacity
Automatic
background rebuilds
Configurable
stripe size and write policy per array
Intelligent Drive Handling
In
degraded mode: Skipping irreparable blocks to continue rebuild
In
normal operation: Data block verification and repair
RAID Operation
RAID
level 0, 1, (0+1), 3, 5, 10, 30 , 50, NRAID and JBOD
Multiple
RAID selection
Hot-spare
drive operation
Hot-swappable
drives
Automatic
background rebuilds
Online
drive expansion
Intelligent
Drive Handling
Management
Firmware-embedded
Java-based GUI RAID manager
Centralized
management of multiple arrays over in-band SCSI or Ethernet
Real-time
event notification over Email, LAN broadcast, or SNMP traps
Auto
on-lining of cascaded enclosures
SNMP
2.0 MIBs with get and set commands
Firmware-embedded
utility via LCD keypad or RS-232C port
Maintenance & Availability
Optional
Li-ion battery support
Immediate
array availability
System Components
Redundant, hot-swappable components, designed for no single point
of failure
2U
RAID enclosure
Single
RAID controller
12
drive trays
Dual
redundant power supplies
2
hot-swappable fan modules
Host Interface
Two
SCSI-320 Host Channels
2
x VHDCI 0.8mm SCSI
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
3.5",
1" high disk drives
12
hot-swappable drive trays
Automatic
bad sector reassignment
Drive
hot-swappable via SCA-II connectors
Dual
channels across 12 drives within each enclosure
Management Software
System
monitoring via out-of-band Ethernet
RAIDWatch
manager software for all major platforms via an Ethernet port
Firmware-embedded
manager via RS-232C (audio jack) (platform independent)
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
All environmental thresholds associated with this mechanism are
user-configurable caching mode changes back to write-back once normal
condition is restored.
External Connections
Two
VHDCI SCSI connectors
One
RS-232C (audio jack) serial port connector (38400, n, 8,1)
One
RJ45 Ethernet port
Physical/Electrical
Interfaces
2
VHDCI 0.8mm SCSI connectors
One
DB-9 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
Chassis dimensions: 88H x 446.2W x 486.5D mm
(w/ protrusions): 88H x 481W x 525D mm
Package dicmensions: 344H x 600W x 670D mm
System weight (w/o drives)
Net weight: 18kg
Gross weight: 25.5kg
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Please contact our sales team at sales@caeneng.com or our service department at support@caeneng.com if you want to find out more!
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