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Fibre Channel Introduction

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Supports EE Credit Flow Control. No BB Credit Flow Control. In Order Delivery Guaranteed ... Supports EE Credit Flow Control. Supports BB Credit Flow Control ... – PowerPoint PPT presentation

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Title: Fibre Channel Introduction


1
Fibre Channel Introduction
  • 91.560

2
Objectives
  • High Level Overview
  • Learning FC Structure and Concepts
  • Understanding FC Protocol for SCSI

3
Overview
  • FC Levels

4
Overview (cont)
  • SCSI-3 Command Set Vs SCSI-2
  • Serial FC Transport Vs Parallel SCSI
  • FC Link Services
  • Arbitrated Loop Primitives
  • Loop Initialization
  • Arbitrate
  • Open
  • Close

5
Overview (cont)
  • Fibre or Copper Links (GLMs)
  • 133, 266, 531 and 1062 Megabaud

6
Overview (cont)
  • Topologies
  • N_Port
  • F_Port
  • NL_Port
  • FL_Port

7
Overview (cont)
  • Topologies (cont)

8
FC Building Blocks
  • Transmission Character
  • Ordered Set
  • Frame

Data Field (0 to 2112)
CRC (4)
Header (24)
SOF (4)
EOF (4)
Optional Headers
Payload
9
FC Building Blocks (cont)
  • Frame (cont)
  • Frame Header Information
  • Routing Control
  • Destination ID
  • Source ID
  • Type
  • Framing Control
  • Sequence ID
  • Data Field Control
  • Sequence Count
  • Originator ID
  • Responder ID
  • Parameter

10
FC Building Blocks (cont)
  • Frame (cont)
  • Frame Types
  • FC-4 Device Data
  • Extended Link Data
  • FC-4 Link Data
  • Sequence
  • Exchange
  • Video Data
  • Basic Link Data
  • Link Control

Exchange
Sequence
Sequence
Sequence
Frame
Frame
Frame
Frame
Frame
Frame
11
FC-2 Transport Functions
  • Flow Control
  • Buffer-to-Buffer Credit
  • Link Level
  • End-to-End Credit
  • Transport Level
  • ULP Level
  • Communication Models
  • Full Duplex
  • Half Duplex

12
FC-2 Transport Functions (cont)
  • Classes of Service
  • Class 1
  • Supports EE Credit Flow Control
  • No BB Credit Flow Control
  • In Order Delivery Guaranteed
  • Guaranteed Max. Bandwidth Between Two Nodes

13
FC-2 Transport Functions (cont)
  • Classes of Service (cont)
  • Class 2
  • Referred to as Packet Switched in the Fabric
    Model
  • Supports EE Credit Flow Control
  • Supports BB Credit Flow Control
  • In Order Delivery Not Guaranteed
  • Allows for Better Use of Fabric Link Bandwidth

14
FC-2 Transport Functions (cont)
  • Classes of Service (cont)
  • Class 3
  • No EE Credit Flow Control
  • Supports BB Credit Flow Control
  • Requires ULP Level Flow Control
  • In Order Delivery Not Guaranteed
  • Allows for Better Use of Fabric Link Bandwidth
  • Added Performance Benefit of No ACKs
  • Intermix
  • Unused Class 1 Bandwidth Used for Class 2 and 3

15
FC-2 Transport Functions (cont)
  • Block Management
  • Data Reassembly
  • Link Services
  • Basic Link Services
  • ABTS
  • Extended Link Services
  • Login, Process Login, Discovery, ...

16
FC Protocol for SCSI
  • Defines ULP Mapping to Send SCSI Information
  • Defines Data Information Units
  • FCP_CMND (unsolicited command)
  • FCP_XFER_RDY (data descriptor)
  • FCP_DATA (solicited data)
  • FCP_RSP (command status)
  • Equates a SCSI IO Operation to an Exchange
  • Equates the Associated SCSI Phases to Sequences

17
FC Protocol for SCSI (cont)
ARB
FCP_CMND
FCP_XFER_RDY
Loop
SCSI ULP
SCSI ULP
FC Transport
FC Transport
NL_Port
NL_Port
FCP_DATA
FCP_RSP
OPN
CLS
Target
Initiator
Responder
Originator
SCSI Write Operation
18
FC Exception handling
  • ULP Level
  • Task and Loop Management
  • Transport Level
  • Sequence and Link Service Management
  • Link Level
  • Link Management

19
FC Committees
  • ANSI x3T10 SCSI specifications
  • ANSI x3T11 FC Specifications
  • FCSI Profiles
  • FCA Profiles
  • Ad Hoc Profiles

20
FC References
  • FC Physical and Signaling Interface (FC-PH)
  • Arbitrated Loop (FC-AL)
  • FC-AL Direct Attach SCSI Profile (Private Loop)
  • Fibre Channel Protocol for SCSI (FCP)
  • Peer Protocolss The Users Guide to Serial SCSI
  • Ancots What is Fibre Channel
  • Ancots Fibre Channel Volume One The Basics
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