HP StorageWorks IP Storage Router - Manual (Page 230)

Recommended Host/Storage Configurations
230 IP Storage Router SR2122-2 User Guide
FCIP with Remote iSCSI Hosts
The FCIP configuration with local iSCSI hosts may be extended by locating the
iSCSI hosts apart from either site A or site B. This configuration requires that the
iSCSI IP network be connect to the large SAN through a WAN network as shown
in
Figure 57 .
Figure 57: FCIP with remote iSCSI hosts
This configuration allows the iSCSI hosts to access disk LUNs at either site A or
site B, providing maximum configuration flexibility.
Note: Within the WAN network the iSCSI protocol traffic is kept isolated from the FCIP
protocol traffic and connects to the SR2122-2s through the second Gigabit Ethernet port
on each gateway.
The SR2122-2 has the capability to rate-limit or "pace" the FCIP protocol traffic
that it handles. This is accomplished using standard Fibre Channel flow control
mechanisms which allows the user to limit the amount of FCIP traffic through the
SR2122-2 so that it does not exceed the bandwidth allotted for this connection
through the WAN network.
However, the iSCSI protocol traffic has no corresponding flow control
mechanism. If the iSCSI protocol traffic and the FCIP protocol traffic are
combined on a single network and if the combined traffic exceeds the available
FC disk A FC disk B
FC tape A FC tape B
(iSCSI)
WAN network
(FCIP)
FC network A FC network B
IP network
(iSCSI)
FC Host A
HP SR2122-2 A HP SR2122-2 B
FC Host B iSCSI Host
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