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© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) Module 3.4
© 2007 EMC Corporation. All rights reserved.
Internet ProtocolStorage Area Networks (IP SAN)Internet ProtocolStorage Area Networks (IP SAN)
Module 3.4
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 2
IP Storage Area Networks
Upon completion of this module, you will be able to:
Describe the benefits of IP SAN
Describe IP convergence in the SAN and its implications
Describe and discuss the basic architecture of – FCIP
– iFCP
– iSCSI
Explain potential applications of IP SAN technology
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 3
In this Module
This module contains the following lessons:
IP SAN overview
IP SAN protocols
Applications of IP SAN
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 4
Lesson: IP SAN Overview
Upon completion of this lesson, you will be able to:
Describe the benefits of IP SAN
Describe the IP convergence in the SAN and its implications
List the three common IP SAN approaches
List the three deployment models (topologies) for IP SAN
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 5
Introduction Traditional SAN technology is built around Fibre Channel
IP technology is emerging as an alternative or supplemental transport for storage traffic
= IP= FC
Switch
Servers Servers
Servers Servers
Switch
Storage Storage
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 6
FCFC IPIP IPIP FCFCIP
FC/IP
FC/IP
FC/IP
FC/IP
IP
IP/ FCIP/ FC
IP/FCIP/FC
Block Storage over IP – Protocol Options
iSCSI– SCSI over IP
IP encapsulation done on host / HBA(host bus adapter)
Hardware-based gateway to Fibre Channel storage
FCIP– Fibre Channel-to-IP bridge / tunnel
(pointto point) Fibre Channel end points
iFCP– IP as the inter-switch fabric
Fibre Channel end points
IPIPIP
IPIP FCFC
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 7
IP Storage Approaches
iSCSI
FCFC
FC
FC
FC
IPNetwork
IPNetwork
IPNetwork
IPNetwork
iFCPFCIP
iFCP Switch
iFCPSwitch
FCIP Router
FCIP Router iSCSI/FC Gateway
Servers
Storage
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 8
IP Storage Deployment Models
= IP= FC
Native All Ethernet (No Fibre Channel) iSCSI Protocol Ethernet Switches & Routers
Bridging Servers - Ethernet Attached Storage - FC Attached (SAN or DAS) iSCSI Protocol
Extension Servers & Storage - SAN Attached FCIP or iFCP Protocol SRDF
= IP= FC
= IP= FC= IP= FC
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 9
Market Drivers for SAN Internetworking
Fibre Channel SAN challenges
IP SAN enablers
Easy to leverage IP equipment and expertise to help manage data in conjunction with Fibre Channel SANs
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 10
Benefits of IP SAN
Cost Effective
Extend the reach of a SAN
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 11
IP is Cost Effective
Most organizations already have IP networks and familiarity with traditional network management
Leverages existing Fibre Channel applications
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 12
Extend the Reach of Your SAN
Standard Fibre Channel Distances
IP Extends Fibre Channel applications over regional/global distances
At higher link speeds, IP can handle synchronous applications
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 13
Lesson Summary
Topics in this lesson included:
Describe the benefits of IP SAN
Describe the IP convergence in the SAN and its implications
List the three common IP SAN approaches
List the three deployment models (topologies) for IP SAN
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 14
Lesson: IP SAN Protocols
Upon completion of this lesson, you will be able to:
Describe and discuss the basic architecture of – FCIP
– iFCP
– iSCSI
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 15
Fibre Channel over IP - FCIP
Encapsulates FC frames in IP packets
Creates virtual FC links that connect devices and fabric elements
Includes security, data integrity, congestion and performance specifications
IP Datagram
IPHeader
TCPHeader
FCIPHeader IP PayloadIP Payload
Fibre Channel Frame
SO
F FCHeader C
RC
EO
F
SCSI DataSCSI Data
FCIP EncapsulationFCIP Encapsulation
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 16
FCIP Benefits
FCIP – Best of both technologies
– Support for existing applications
– Cost effective
– Multi-point networking
Fibre Channel• Widely available• Low latency• High reliability • Off-the-shelf solutions• Mature standards
IP• Widely available• Accepted technology• Trained user base• Affordable• Mature standards
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 17
Internet Fibre Channel Protocol - iFCP
Gateway-to-gateway protocol– IP switches & routers replace FC switches
– Transparent to FC drivers
FC transport uses TCP connections– Point-to-multipoint networking possible
IPHeader
TCPHeader
iFCPHeader IP PayloadIP Payload
Fibre Channel Frame
SO
F FCHeader C
RC
EO
F
SCSI DataSCSI Data
iFCP Address Translation &Encapsulation
iFCP Address Translation &Encapsulation
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 18
iFCP Benefits
Works with wide range of devices
Flexible
Less potential bottlenecking vs. FCIP
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 19
iFCP Maps FCP to an IP Fabric
Device-to-device session
IP Network
iFCP Gateway
iFCP Gateway
FC Switch
FC Loop Disks
iFCP Gateway
iFCP Gateway
FC Tape Library FC Server
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 20
iFCP
SAN A SAN B
The two fabrics remain separate
Switch
Servers
Storage
Switch
Storage
ServersGateway Gateway
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 21
iSCSI
A method to transfer blocks of data using the TCP/IP network
Serialized service delivery subsystem
SCSI protocol over IP
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 22
iSCSI Model Layers
IPHeader
TCPHeader
iSCSIHeader IP PayloadIP Payload
SCSI Data
SCSI encapsulation
IP Datagram
Storage
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 23
iSCSI Storage Models
Native
Bridging
= IP= FC
Switch
Servers
Storage
Gateway
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 24
Controlling IP SANS
Target Z
Initiator B
Initiator CInitiator A
iSNS
IP Network
A
B
CTarget Z - Device A – Initiator A
Target Z - Device B – Initiator B
Target Z - Device C – Initiator C
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 25
Internet Storage Name Server Overview
iSNS is a client/server model
The iSNS server is passive
iSNS clients register & manipulate the objects in the iSNS server
An iSNS server can be hosted on a target, initiator, or stand-alone server with a specified IP address
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 26
iSCSI Nodes
A single Initiator or Target
Names are assigned to all Nodes
Independent of address
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 27
Lesson Summary
Topics in this lesson included:
The basic architecture of FCIP
The basic architecture of iFCP
The basic architecture of iSCSI
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 28
Lesson: IP SAN Applications
Upon completion of this lesson, you will be able to:
Describe common applications of IP SAN technology such as:– Remote Backup and Restore
– Remote Data Replication
– Storage Consolidation
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 29
Remote Backup and Restore
IP Network
FC
FC
FC
Servers
Storage
Disks
Disks
Disks
Server
Server
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 30
Remote Data Replication
IP Network
FC
FC
FC
Servers
Storage
Disks
Disks
Disks
Server
Server
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 31
Storage Consolidation/Dual Purpose IP Network
IP Network
Servers
Switch
Disks
Disks
Disks
SwitchSwitch
Switch
Disks
Disks
Disks Servers
Servers
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 32
Lesson Summary
Topics in this lesson included:
Remote backup and restore
Remote data replication
Storage consolidation
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 33
Module Summary
Topics in this module included:
The benefits of IP SAN
The IP convergence in the SAN and its implications
The basic architecture of FCIP
The basic architecture of iFCP
The basic architecture of iSCSI
Application of IP SAN technology
© 2007 EMC Corporation. All rights reserved. Internet Protocol Storage Area Networks (IP SAN) - 34
Check Your Knowledge
What are the benefits of IP SAN?
What are the three common protocols for IP SAN?
What data storage application could benefit from an IP SAN solution?
