ATTO Technology VT-Class manual Appendix a Glossary, Fibre Channel technology, SAN technology

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Appendix A Glossary

The following terms are only a few examples of the language used for Fibre Channel, SCSI and storage systems. For more information, visit the websites of these professional organizations: the Fibre Channel Industry Association www.fibrechannel.org; the Fibre Channel Consortium www.iol.unh.edu/consortiums/index.html click on Fibre Channel; the Storage Area Networking Industry Association www.snia.org, or SCSI Trade Association www.scsita.org.

Fibre Channel technology

Fibre Channel (FC) is a serial communication interface designed to transfer large amounts of data among a variety of hardware systems over long distances. It is becoming a key technology for applications that require shared, high-bandwidth access to storage.

Fibre Channel provides a logical point-to point serial channel for the transfer of data between a buffer at a source device and a buffer at a destination device. It moves buffer contents from one port to another, without regard to the format or meaning of the data, allowing different upper level protocols to run over the Fibre Channel connection.

The Fibre Channel architecture is a hierarchical set of protocol layers. Defined within these layers are rules for signal interfaces, serial encoding and decoding, error control, frame format and communications protocols. Fibre Channel provides a range of implementation possibilities and purposely isolates the transmission medium from the control protocol so that each implementation may use the technology best suited to the application.

Fibre Channel arbitrated loop (FC-AL) technology allows 127 systems and devices to be distributed over

a range of up to 10 kilometers running at speeds of 1 gigabit/sec. Multiple FC-AL loops can be connected via a fabric switch topology to extend the range.

SAN technology

A Storage Area Network (SAN) is a shared storage architecture. SANs connect computers and storage devices for online data access. Each connected system can directly access any attached storage device. A SAN maintains greater fault tolerance and load balancing by supporting server clustering and fail-over (the ability for one server to take over for another in the event of a failure.

SCSI protocol

SCSI (pronounced scuzzy) stands for Small Computer System Interface, a processor-independent standard for system-level interface between a computer and SCSI devices such as hard disks, CD-ROM and printers, and to other computers and local area networks.

The protocol has many standards specifying data transfer rates, data width and speeds which allow SCSI devices to exchange data and control signals with a computer's CPU. Each device connected to a SCSI bus must have a different SCSI ID.

Term

Definition

arbitrate

process of selecting one L_Port from a collection of ports which ask for use of the arbitrated

 

loop at the same time

arbitrated loop

a loop topology in which two or more ports are interconnected, but only two ports can

 

communicate at one time

ATA

Advanced Technology Attachment: A disk drive interface standard, formerly called IDE; the

 

ATA specification deals with the power and data signal interface of an integrated disk

 

controller and drive

auto negotiation

hardware senses and automatically responds depending on configuration

CLI

Command Line Interface: used by applications and advanced users to perform diagnostic

 

or configuration tasks; access is available through a computer terminal or terminal emulator

 

via connections to the RS-232 port or the optional Ethernet management services card via

 

the local area network using Telnet

fabric

A FC switch or two or more FC switches interconnected to physically transmit data between

 

any two N_Ports on a switch or switches

A-i

ATTO Technology Inc. Diamond Storage Array Installation and Operation Manual

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Contents Diamond Storage Array VT-Class Page Page Contents Atto ExpressNAV Browser-based Interface ExpressNAV PagesMaintenance Services Commands Fibre Channel Configuration CommandsSerial Port Configuration Commands Diagnostic CommandsDrive Management Commands ECCResetting Defaults Configuring the Diamond-VTDiagnostics, Upgrade and Maintenance Troubleshooting Virtual TapeAppendix F Product Safety Xiii Appendix D Sample Zoning Command SequencesAppendix E Specifications Xii Appendix G Part numbers Xiv Appendix H WarrantyDisclaimer PrefaceAtto Technology, Inc Page Diamond-VT features Diamond Storage Array-VT Product OverviewFibre Channel model Scsi modelEthernet Diamond-VT Technical OverviewRS-232 400MB/secAdxt Powers ATA to New Levels ATA Interface Engine AIE The interface to eachSet up the Ethernet connection Installation InstructionsPhysical setup Connect to EthernetConnect to Ethernet, on page 5, follow Set up Virtual Tape configurationConfiguration examples RAID Level 10 with Hot Spare sledsDiamond-VT Components Floor modelRack mount model Floor Model Diamond-VT Physical SetupRack Mount Physical setup Autoconfiguration Connecting a Fibre Channel ArrayManual configuration Fibre Channel connections Bus speed, MB/sec Bus width Max. bus lengths Max. device Connecting a Scsi ArrayTo connect the Scsi Diamond-VT BitsScsi connections Atto ExpressNAV Accessing the Diamond-VTCommand Line Interface RS-232 portSnmp Details In-band CLI Over Fibre ChannelInitiator Host Diamond-VT Initiator/Host Diamond-VT Serial Port Access Serial port access To use Telnet Ethernet Access Telnet and Snmp ProtocolsTo connect to the Ethernet port To use SnmpTraps are generated for the following situations Navigating ExpressNAV Atto ExpressNAV Browser-based InterfaceBrowser compatibility Reset button Parameter name Submit buttonExpressNAV Pages Logical Units Tape VolumesConfiguration PartitionsSaveConfiguration command CLI Interface via ASCII-based CommandsReady Return type/mode Return format/content HostnameSummary of CLI Commands Command Defaults ExampleCLI index Zoneaddhost zone1 General Use Commands Ethernet Commands TelnetTimeout SNMPUpdatesTelnetPassword SNMPTrapsFibre Channel Configuration Commands FcScsiBusyStatus FcPortListFcPortName FcWWNameSerialPortHandshake Serial Port Configuration CommandsSerialPortBaudRate SerialPortEchoMaintenance Services Commands Diagnostic Commands TapeVolumeInfo PowerAudibleAlarmSledFaultLED RAID5ClearDataStatusDrive Management Commands IdeTransferRate DriveWipeLUNState IdeWriteCacheRAIDHaltRebuild RAID5ClearDataRAIDInterleave RAIDManualRebuildRebuildPriority RestoreModePagesTapeVolumeBlockSize TapeWriteProtectZoneDelete ZoneClearAllZoneCreate ZoneRemoveDeviceCLI configure drives RAID Level Configuring the Diamond-VTVirtual Tape Volumes Hot Spare sledsInterleave Enhancing performanceVirtual Tape To set up RAID Level 10 with Hot Spare sleds Optional Hot Spare SledPrinciples of Zoning Planned configuration is a work-in-processZones Device portion defines the LUNsStatus and Sense Data Factors to considerType ZoneInfo To remove zones Configuring ZoningTo create a zone To change current zonesErrors Zone definition tables The Zone commandsUpdating firmware via the RS-232 serial port Updating FirmwareUpdating firmware via the optional Ethernet card Cd c\diamond\flash Type put ....imaRS-232 Monitoring Port and CLI One tool to Diagnostics, Upgrade and MaintenancePower On Self Test Post Each time Ethernet Monitoring Port and CLI If the optionalSystem Fault LED and Error Codes If a serious Power Supply Monitoring The Diamond-VT25C 32C 35C 40C Disk Drive Activity and Disk Fault LEDs Each Monitoring, reporting Command Line Interface messages TroubleshootingWindows 2000 special instructions Error Messages Specific situations and suggestionsIf you cannot read or write to the Diamond-VT If a power supply failsIf you can’t access the Diamond-VT CLI via Ethernet Type FirmwareRestart in CLIDefault Resetting DefaultsFactory Default Return to Default settingsCommand Default Rebuilding RAID Level 5 and 10 Configurations To synchronize mirrored drives manually Hardware Maintenance Hardware maintenance Hot Swap Operating Instructions Disk DrivesTo replace a blower assembly Power SuppliesBlower Assemblies SAN technology Appendix a GlossaryFibre Channel technology Scsi protocolAppendix Appendix B ATA Disk Technology FeatureFibre Channel Appendix C LunInfo for a Jbod setup LunInfo PartitionInfo active 59TapeVolumeInfo ZoneInfoViii Simple configuration Appendix D Sample Zoning Command SequencesFirst time configuration after download Symmetric ModelZoneAddPort zone1 ZoneCreate zone2 Asymmetric ModelZoneClearAll ZoneCreate zone1 ZoneAddPort zone2 ZoneCreate zone3Combined Symmetric/Asymmetric Model Floor Mount Dimensions Appendix E SpecificationsRack Mount Dimensions Environmental and physicalEMC specifications Appendix F Product SafetySafety compliances Radio and television interferenceAppendix G Part numbers Description All modelsManufacturer limited warranty Appendix H WarrantyContact Atto Technology, Inc
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