|
All PDF forms require the free Adobe
Acrobat Reader.
Overview
The Comet SATA II 24eU 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.
The Comet combines two SCSI-320 host channels with 24 drive bays
in a smartly managed enclosure. This scalable, fault-tolerant storage
subsystem is well-suited for clustered or direct-attached storage
applications and has the flexibility to serve applications running
different I/O characteristics. High throughput is guaranteed by
segregating I/O traffic across the dual PCI-X buses, while IOPS
performance is delivered through the internal buffer on the XOR
engine and CPU using intelligent firmware algorithms.
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.
Media Scan performs the following tasks to ensure data integrity:
 Scans disk drives for
bad blocks and data inconsistencies
Retrieves inaccessible
data from other member drives
Attempts to rewrite onto
the original disk blocks
Distributes regenerated
data to other healthy sectors if rewrites fail (i.e., the original
disk sector is unreliable)
Combined with Media Scan, Task Scheduler arranges the scanning operation
to a time when the subsystem is less stressed with daily service.
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.
The Comet A24U 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, 10, 30, and 50, 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. System configuration data and event
logs are constantly updated on the disk drives' reserved space to
minimize the effort required to recreate a fault scenario. An administrator
may also manually retrieve data from a system drive or the array
itself.
Caen’s Smart Technologies
Derived from more than ten years of experience in RAID storage design,
Caen's firmware features extremely compact protocol and rich varieties
of algorithms to deal with the stringent requirements of storage
applications. The technologies enhance I/O processing, drive handling,
and system management.
IOSmart
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
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
SysSmart combines enclosure monitoring and firmware management capabilities
designed to minimize the chance of downtime caused by hardware failures.
With SysSmart, Caen'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.
Specifications:
Subsystem Characteristics
600MHz RISC CPU, 512KB
L2 cache
ASIC266 RAID engine
2G DDR cache memory
BBUs keypad panel
LCD keypad panel
2 COM ports per controller
1 Ethernet port per controller
Diagnostic LEDs on all
FRUs
Drive Interface
24 disk trays
Serial ATA II/I drive
supported
Host Interface
4 VHDCI SCSI ports
320MBps Single controller
bandwidth
Tag command queuing
Multiple target IDs
RAID Configurations
RAID levels 0, 1(0+1),
3, 5, 10, 30, 50, JBOD
Max. 16 logical drives
Max. 128 LUNs
Multiple array configurations
Automatic background rebuild
Caen Smart Technologies
High Availability
Redundant, hot-swappable
FRUs
Subsystem self-diagnostics
Dedicated and Global hot
spare HDDs
Li-ION battery backup
module
UPS support
Management Software
RAIDWatch Manager software
Terminal via RS-232C
Telnet over Ethernet
LCD keypad panel
Event notification methods:
- Email
- Fax
- LAN broadcast
- SNMP traps
- Cell phone message (SMS)
- Instant messages (MSN/ICQ)
OS Support
Microsoft Windows NT
Microsoft Windows 2000 Server
Microsoft Windows 2003 Server
Sun Solaris ver. 8/9
Red Hat Linux ver. 8/9, Enterprise ver. 3
SUSE Linux ver. 8/9
Requirements
AC Input: 100VAC at 10A; 240VAC at 5A with PFC (auto-switching)
DC Output: 12V-32A; 5V-32A; 3.3V-30A
Relative Humidity: 5% to 95% non-condensing
Operating Temperature: 0°C to 40°C
Dimensions
4U, 19-inch rackmount chassis
Without handles: 446(W) x 176(H) x 490(D) mm (17.6 x 6.9
x 19.3 inches)
With handles: 482(W) x 176(H) x 505(D) mm (19 x 6.9 x 19.9
inches)
Download
the printable PDF from our FTP site!
Please contact our sales team at sales@caeneng.com or our service department at support@caeneng.com if you want to find out more!
Caen Engineering, terms of service, Find an error on the site? Contact the Webmaster at danielle@caeneng.com. © 2005, Caen Engineering |
