Fibre Channel How To

7/31/2019 Fibre Channel How To

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Hugo Caote @ CERN-IT

Fiber Channel How-ToBa

sic


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Standard

Fiber Channel is an open standard communications and transport protocol as defined by ANSIand operates over copper and fiber optic cabling at distances of up to 10 kilometers.

Single-mode (SM) fiber allows for only one pathway, or mode, of light to travel within the fiber.

Multi-mode (MM) fiber allows more than one mode of light. Multi-mode fiber is better suited forshorter distance applications.

Fiber Channel Speed: up to 1Gb/s, 2Gb/s, 4Gb/s

Maximum Transmission Unit: 64 kB but in theory unlimited

The structure of a fiber optic cable Fiber Channel adapter cable


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Topology

This is the simplest topology to configure. Apoint-to-point configuration is a directconnection between two endpoints.

This is a ring topology that shares the fiber-channel bandwidth among multipleendpoints. The loop is implemented within a

hub that interconnects the endpointsAn arbitrated scheme is used to determinewhich endpoint gets control of the loop. Themaximum number of ports is 127.

This topology provides the most flexibility

and makes the best use of the aggregatedbandwidth by the use of switchedconnections between endpoints.One or more switches are interconnected tocreate a fabric, to which the endpoints areconnected


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Terminology

A node is an endpoint that contains information. Itcan be a computer (host), a device controller, or aperipheral device (such as disk or tape drives).

Each node must have at least one port (hardwareinterface) to connect the node to the FC topology.This node port is referred to as an N_Port.Other port types include:

An expansion portis used to interconnectswitches and build a switched fabric.

A fabric portis used to connect an N_Portto a switch that is not loop-capable.

A fabric loop portis used to connectNL_Ports to a switch in a loop configuration.

A generic portis a port that has notassumed a role in the fabric.

A loop portis a port in a Fibre ChannelArbitrated Loop (FC-AL) topology.

A node loop portis an N_Port with loopcapabilities.


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Naming and addressing

Worldwide node name (WWNN)

Worldwide port name (WWPN)

This is similar to the way that all Ethernet cardshave a unique MAC address(eg.

Port Addressing- Domain- Area- Port or arbitrated loop physical address ALPA


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FC CERN infrastructure
http://var/www/apps/conversion/current/tmp/services.asp


7/10Hugo Caote @ CERN-IT

FC CERN infrastructure

Port Id: =0 x 00 00 01

Port Id: =0 x 00 00 EF

Private loop port id first 4 bytes 0 last 2 bytes ALPA table.

Port id with lowest address arbitrates the loop.



FC host bus adapter configuration

Adapter Menu

Target Menu

Main Menu

SCLI Qlogic command line interface



FC tape drive configuration

Locally in tape drive(menu, select button)

Remotely with StdsWin(if RJ-45 connection available)



FC tape drive addressing

The unknown famous ALPA table 0x01 0x02 0x04 0x08 0x0F 0x10 0x17 0x18 0x1B

0x1D 0x1E 0x1F 0x23 0x25 0x26 0x27 0x29 0x2A

0x2B 0x2C 0x2D 0x2E 0x31 0x32 0x33 0x34 0x35

0x36 0x39 0x3A 0x3C 0x43 0x45 0x46 0x47 0x49

0x4A 0x4B 0x4C 0x4D 0x4E 0x51 0x52 0x53 0x54

0x55 0x56 0x59 0x5A 0x5C 0x63 0x65 0x66 0x67

0x69 0x6A 0x6B 0x6C 0x6D 0x6E 0x71 0x72 0x73

0x74 0x75 0x76 0x79 0x7A 0x7C 0x80 0x81 0x82

0x84 0x88 0x8F 0x90 0x97 0x98 0x9B 0x9D 0x9E

0x9F 0xA3 0xA5 0xA6 0xA7 0xA9 0xAA 0xAB 0xAC

0xAD 0xAE 0xB1 0xB2 0xB3 0xB4 0xB5 0xB6 0xB9

0xBA 0xBC 0xC3 0xC5 0xC6 0xC7 0xC9 0xCA 0xCB

0xCC 0xCD 0xCE 0xD1 0xD2 0xD3 0xD4 0xD5 0xD6

0xD9 0xDA 0xDC 0xE0 0xE1 0xE2 0xE4 0xE8 0xEF

24 bit address

08 . . 02 01 00

Index to theALPA table,08 = 0xD9

Use a new Physical addresseach time/use the samePhysical address each time

Max data size

WWPN

Search Loop Id inhigh/low order

9940tapedriveview

cfgm

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Fibre Channel How To