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Modeling and Evaluation of Fibre Channel Storage Area Networks. Xavier Molero, Federico Silla, Vicente Santonia and Jose Duato. Introduction. What is a SAN (Storage Area Network) A separate high-speed network for storage Isolated from messaging network

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modeling and evaluation of fibre channel storage area networks

Modeling and Evaluation of Fibre Channel Storage AreaNetworks

Xavier Molero, Federico Silla, Vicente Santonia and Jose Duato

introduction
Introduction
  • What is a SAN (Storage Area Network)
    • A separate high-speed network for storage
    • Isolated from messaging network
    • Optimized for moving data between servers and storage devices
  • How it is different from traditional server-storage network
traditional server storage architecture
Traditional Server-Storage Architecture

Limitations:

  • Unavailability of data in case of a failure on server
  • Bandwidth saturation during backups
fibre channel
Fibre Channel
  • Generic transport mechanism
  • Provides an interface for high-speed data transfer(gigabit per second) and long distance(up to 10 km)
  • Standard provides definitions about physical layer characteristics, transport control protocol, and upper level interface to TCP/IP, SCSI, and other protocols
  • Some features are not specified(routing algorithm, internal switch architecture)
fibre channel cont
Fibre Channel (cont.)
  • Switching Mechanism

virtual cut-through: incoming messages are forwarded as soon as they are routed and out port is free

  • Flow Control Mechanism

credit scheme

system model
System Model
  • Switch Architecture
  • Network Topology
  • Routing Algorithm
  • Communication Pattern
  • Disk response time model
  • I/O load generation
network topology
Network Topology
  • Single room
    • Regular:

Fattrees, meshes, multistage networks, and fully connected topologies

    • Irregular:

randomly generated, a single link connects two switches

  • Floor topologies
routing algorithm
Routing Algorithm
  • Distributed routing
    • Leaving routing decisions to each switch
  • Up*/down* routing (partially adaptive)
    • Based on breadth-first spanning tree(BFS)
  • Minimal adaptive routing (fully adaptive)
communication pattern
Communication Pattern
  • Request parameters:
    • Disk ID
    • Access type (read or write)
    • Starting location (sector number)
    • Requested size
disk response time model
Disk Response Time Model
  • A single server queue with a FIFO discipline service
  • Composed of three parts:
    • Seek time
    • Rotational latency
    • Transfer time
i o load generation
I/O Load Generation
  • Use auto-similar arrival pattern

Real traffic is bursty and the bursts exist over many time scales

  • Model each server as a set of ON/OFF sources
  • Model the length of ON/OFF periods with Pareto distribution
  • Simulator can be feed with real-world I/O traces
evaluating sans performance
Evaluating SANs Performance
  • Effect of switch architectures on performance
  • Effect of faulty links on performance
summary
Summary
  • SAN is a alternative to traditional server-to-disk approach
  • Fibre channel is a prominent technology for implementing SAN.
  • The simulator considers a wide set of characteristics and is a key tool for the design and evaluation of SANs.
questions
Questions
  • What is a storage area network?
  • What are the limitations of traditional server-storage architecture?
  • Name some features of fiber channels.