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iSCSI in a Heterogeneous SAN
6 iSCSI SR2122 Storage Router: Getting Started Guide
iSCSI in a Heterogeneous SAN
Although the iSCSI protocol is written as a complete data transport from host to storage this
chapter will only discuss the current HP supported topology of iSCSI hosts to Fibre Channel
storage using the HP SR2122 iSCSI Router.
For further details please read “HP StorageWorks iSCSI storage router 2122 User Guide PN:
304835-002” Section 4 -SCSI Routing Overview.
Typical Network Structure
The addition of iSCSI to the SAN means that two data protocols need to be configured/
managed – TCP/IP and Fibre Channel. IP hosts with iSCSI drivers access the SR2122 through
an IP network connected to the Gigabit Ethernet interface of each SR2122. The SR2122
accesses FC storage devices connected to the Fibre Channel interfaces of each SR2122.
A typical IP/FC network example:
Figure 1: IP/FC Network Example
Client, Host, or
iSCSI Initiator
HP SR2122
Storage Router
HP
StorageWorks
MSA 1000
Storage
Server or Workstation
running W2K or Linux
IP Ethernet Protocol
FC Protocol
SAN Storage
Has the ’iSCSI Driver’
loaded on it to enable
Target resource
recognition & attachment.
Has the LUNs
(resources) configured
without ANY special
drivers, F/W, or
protocols required.
iSCSI Router
Terminology:
Components:
FC protocol and back.
1. Defines Client Access.
2. Defines Paths to Targets.
4. Provides Routing functions.
5. Provides Target Addressing.
3. Converts Ethernet IP to
’Sees’ the Storage ’Target’
Resources (LUNs) as if they
were just local drives attached
directly to the system.
Fibre Channel Ports
Gigabit Ethernet Ports
Fibre Channel Switch/Fabric
SD
SD
ESC
DLT
PROLIANT
8000
IP Switch/Fabric