the emc effect page.1 building the esn infrastructure doing business without barriers emc enterprise...
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THE EMC EFFECTTHE EMC EFFECT
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Building the ESN Infrastructure
Doing business without barriers
EMC Enterprise Storage Network
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Agenda Fibre Channel Basics
Enterprise Storage Network (ESN) Introduction
ESN Connectivity—Direct Connect—FC-AL Hubs—Connectrix Fibre Channel Director
ESN Access Control—Zoning—Volume Logix
Case Studies
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Fibre Channel Characteristics High speed serial data transfer
Unaware of content of information being transferred
Simultaneously supports multiple protocols
Potential connectivity of millions of devices
Increases distance between devices
Network that performs channel operations
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Fibre Channel
Channels NetworksFibre Channel
HighPerformance
Low ProtocolOverhead
DynamicConfiguration
ExtendedDistance
Multi-systemConnectivity
StaticConfiguration
Short Distance
Single SystemConnectivity
LowPerformance
High ProtocolOverhead
Network that performs channel operations!
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Fibre Channel Architecture
FC4
FC3
FC2
FC1
FC0
SCSI HIPPI ESCON
IP ATM
COMMON SERVICES
FRAMING/FLOW CONTROL
ENCODE/DECODE
12.5MB/sec
25MB/sec
50MB/sec
100MB/sec
FutureHigher Rates
A layered protocol stack similar to OSI
FC0-FC2 provide transport services
FC3 not currently implemented
FC-4 provides encapsulation of other protocols
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ANSI Fibre Channel Standards Protocol Mappings (FC-4)
—SCSI FCP Fibre Channel Protocol for SCSI-3
Physical Signaling (FC-0, FC-1, FC-2)—FC-PH Fibre Channel Physical and Signaling—FC-PH-2 Fibre Channel 2nd Generation Physical and Signaling—FC-PH-3 Fibre Channel 3rd Generation Physical and Signaling
Topologies and Services—FC-FG Fibre Channel Fabric Generic—FC-AL Fibre Channel Arbitrated Loop—FC-AL-2 Fibre Channel 2nd Generation Arbitrated Loop—FC-SW Fibre Channel Switched Fabric
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Fibre Channel Classes of Service
Class 1 - dedicated connection, flow controlled, acknowledged
Class 2 - connectionless, multiplexed, flow controlled, acknowledged
Class 3 - connectionless, multiplexed, flow controlled, datagram
Class F - inter-switch communications
Class 4 - fractional bandwidth, quality of service, virtual channels
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Fibre Channel Topology Terms Node - An end point in the network
Link - A connection between two nodes
Fabric - Multiple Fibre Channel switches interconnected and using Fibre Channel methodology for linking nodes and routing frames n a Fibre Channel network
N_Port - Node port, a port at the end of a point-to-point link.
NL_Port - A port which supports the arbitrated loop topology
F_Port - Fabric port, the access point of the fabric which connects to a N_Port
FL_Port - A fabric port which connects to a NL_Port
E_Port - Expansion port on a switch. Links multiple switches.
G_Port - A port on a switch with the ability to function as either a F_Port or a E_port.
GL_Port - A port on a switch with the ability to function as either a FL_Port or a E_Port.
HBA - Host Bus Adapter, the interface between the server bus and storage network.
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Fibre Channel Topologies
Point-to-Point - Dedicated link between two ports.
Fibre Channel Arbitrated Loop (FC-AL) - Shared interconnect between 2 to 126 nodes.
Fibre Channel Switched Fabric (FC-SW) - Dynamic connectivity between greater than 16 million nodes.
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Point-To-Point
Dedicated full bandwidth connection two nodes No special protocol required to gain access to
the link Basic fabric connection type
N_Port
N_Port
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FC-AL Hub
NL_Port
NL_PortFC Hub
Physical star, Logical loop (FC-AL)
2 to 126 nodes per loop
Nodes arbitrate for control of the loop
One full bandwidth circuit open at a time
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Switched Fabric (FC-SW)
F_Port
FC Switch
N_Port
Point-to-point connection between each node and the switch
N x 100 MB/sec scaled bandwidth
N/2 simultaneous full bandwidth circuits
Greater than 16 million nodes per fabric
EMC Connectrix!
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Fabric Services
FCP
SCSI-3
FCP
FCP
SCSI-3
FA
Host Switch Symmetrix
Fabric Login (FLOGI)
Fabric Login (FLOGI)
Port Login (PLOGI) Simple Name Service (SNS) login supported by switch
Buffer-to-buffer flow control between nodes and switch
Fabric Controller routes frames between nodes
Class 3 implemented today
SNSLogin Server
FabricController
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Fabric Zoning
Zone 1
Zone 2
Creates logical subsets of devices
Devices can only “talk” to devices in the same zone
Increases control of the fabric
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Switch versus Hub Comparison
SWITCHES HUBS
• FC-SW Architecture scaleable to millions of connections.
• Bandwidth per device stays constant with increased connectivity.
• Bandwidth is scaleable relative to connections.
• Switch software includes robust capabilities for managing a topology.
• FC-AL is limited to 127 devices. (substantially fewer connections can be implemented for ideal system performance).
• Bandwidth per device diminishes with increased connectivity.
• Aggregate bandwidth is NOT scaleable relative to connections.
• Limited software management functionality.
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Data Flow Comparison
Hub (loop) - Nodes arbitrate for shared bandwidth.
Switch (fabric) - Full bandwidth on each link.
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Supported Media Types
Media Distance
Copper (Twinax) 30 Meters
Multimode Fiber, 62.5 Micron 175 Meters
Multimode Fiber, 50 Micron 500 Meters
Singlemode Fiber, 9 Micron 10 Kilometers