EMC ATA, FC manual Link Control Cards LCCs, Monitoring Disk Enclosure Status in Chapter

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About DAE2 Disk Enclosures

Link Control Cards (LCCs)

An LCC supports and controls one Fibre Channel loop and monitors the DAE2.

Fault

 

LED

Loop

(Amber) Latch

ID LEDs

Power

LED (Green)

Expansion

Expansion

Primary

Primary

Connector

Link Active

Link Active

Connector

 

LED

LED

 

 

(Green)

(Green)

EMC2165

Figure 1-6LCC Connectors and LEDs

The LCCs in a DAE2 are connected to other Fibre Channel devices (hosts, DAE2s, and so on) using twin-axial copper cables. The cabling is not explicitly configured as a loop (with a long return from the last disk enclosure to the server), but instead, as a set of full-duplex, point-to-point connections with the last disk enclosure in the chain closing the loop on its LCC.

The LCC independently receives and electrically terminates the incoming FC-AL signal. The LCC passes the input signal to the disk drives in the enclosure; it then sends the output signal, via cables, to the next DAE2 in the loop. ATA link control cards provide the same Fibre Channel input and output, but convert those signals to and from the ATA protocol used by their disk drives.

Each LCC independently monitors the environmental status of the entire enclosure, using a microcomputer-controlled FRU (field-replaceable unit) monitor program. The monitor communicates status to the server, which polls DAE2 status. LCC firmware also controls the LCC port bypass circuits and the disk-module status lights.

LCCs do not communicate with or control each other.

Each LCC has four status lights. These status lights are described in

Monitoring Disk Enclosure Status in Chapter 3.

Link Control Cards (LCCs)

1-7

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Contents FC and ATA Models EMC 2-Gigabit Disk-Array Enclosure DAE2Copyright 2002, 2003 EMC Corporation. All rights reserved Regulatory Notices Gigabit Disk-Array Enclosure DAE2 Hardware Reference Contents Chapter Servicing a DAE2 Appendix a Technical SpecificationsFigures Figures Preface Related Documentation Conventions Used in This Guide All Storage Systems on the Operations menu Sales and Customer Service Contacts Xiii Replacing the Lithium Battery About DAE2 Disk Enclosures DAE2 IntroductionIntroduction LED 3Disk Enclosure Rear View Front Bezel MidplaneMonitoring Disk Enclosure Status in Chapter Link Control Cards LCCsDisk Modules Disk DrivesDrive Carrier 8Power Supply/System Cooling Module Power Supply/System Cooling ModulesGigabit Disk-Array Enclosure DAE2 Hardware Reference Installing a DAE2 Site Requirements RequirementsCabling RequirementsRecommendations Installing a Disk Enclosure in a CabinetSetting Up an Installed Disk Enclosure Address +Switch 2Plugging in the ac Line Cord DAE2 PRI SPE LCC B Powerup and Initialization Binding Disk Modules into RAID Groups Servicing a DAE2 Describes the LEDs visible from the front of the DAE2 Monitoring Disk Enclosure StatusLight Quantity Color Meaning Shows the status LEDs for the power/cooling modules Shows the status LEDs for the link control cards Handling FRUs Procedures Without EmergencyAn ESD Kit Precautions When Removing, Installing, or Storing FRUs Replacing or Adding a Disk Module 5Unlocking and Removing the Front Bezel Unlocking and Removing the Front BezelRemoving a Disk Module Removing a Disk Filler Module7Removing a Disk Module FC Disk Carrier Shown Installing a Disk or Filler Module8Installing a Disk or Filler Module FC Disk Carrier Shown 9Installing and Locking the Front Bezel Installing and Locking the Front BezelRemoving an LCC Replacing an LCC Module11Removing an LCC Installing an LCC12Installing an LCC Remove and store the ESD wristband 14Connecting Disk Enclosures Together with Copper Cable Replacing a Power Supply/System Cooling Module 16Removing a Power Supply/System Cooling Module 18Plugging in the Power Cord and Turning on Power Technical Specifications Ac Power Enclosure SpecificationsSize and Weight Drive TypeLCC FC-AL Interface Fibre Channel Related Standards Standards Certification and ComplianceShipping and Storage Requirements Operating LimitsGigabit Disk-Array Enclosure DAE2 Hardware Reference Index LCC Gigabit Disk-Array Enclosure DAE2 Hardware Reference Gigabit Disk-Array Enclosure DAE2 Hardware Reference

FC, ATA specifications

EMC ATA (Advanced Technology Attachment) and FC (Fibre Channel) are two significant technologies in storage networking that enhance data management and access in enterprise environments.

EMC ATA, often associated with ATA storage devices, offers a cost-effective solution for managing large volumes of data. Shipments of ATA drives have become increasingly popular in the realm of consumer electronics due to their affordability and capacity. EMC utilizes ATA drives in various storage solutions, primarily focusing on performance and reliability. These drives handle particular workloads effectively, making them suitable for environments that require mass data storage, such as digital media and backup solutions.

In terms of key features, EMC ATA solutions provide high capacity, reliability, and cost-effectiveness. They are designed to manage routine data storage tasks with ease. These storage devices utilize interfaces that provide straightforward integration with various computer systems. Additionally, EMC ATA solutions come with error detection features and are generally simple to deploy, which is beneficial for teams seeking efficiency without an extensive learning curve.

On the other hand, Fibre Channel (FC) is a high-speed network technology primarily used for interconnecting storage area networks (SANs). Its robust architecture allows for high-speed data transfer rates, typically ranging from 2 Gbps up to 128 Gbps in contemporary systems. The strengths of FC lie in its ability to provide low-latency communications and its reliability in handling large volumes of data traffic.

Fibre Channel's main characteristics include its ability to support multiple protocols, such as SCSI and IP. This compatibility makes it a flexible choice for various storage solutions, especially in large-scale enterprise environments. Additionally, FC switches and directors enable the creation of complex SAN architectures, which can be both scalable and high-performing.

Furthermore, FC ensures data integrity through features such as error correction and data recovery mechanisms, making it an ideal choice for mission-critical applications. Secure connectivity is also a fundamental aspect of Fibre Channel technology, as it continuously secures data as it flows through the network.

Combining the strengths of EMC ATA's cost-effectiveness in bulk storage and the high-performance capabilities of Fibre Channel, organizations can achieve a balanced storage solution tailored to their operational needs. As data storage demands continue to grow, these technologies remain relevant, supporting both traditional and cutting-edge applications in enterprise IT environments.
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