FICON emulation requirement for a determinate path
FICON emulation processing creates FICON commands and responses on extended FICON Channel Path
IDs (CHPIDs), and must know exactly what exchanges are occurring between a Channel and a control unit
(CU) on a CHPID to function correctly. For FICON Emulation processing to function correctly, the responses
to Host I/O (channel I/O) must be carried on the same ISL as the commands.
There are three ways to ensure a determinate path for FICON commands and responses:
Define only one IP route and one FCIP tunnel between sites.
Use a traffic isolation zone (TI zone) to ensure that there is only one path across an ISL or FCIP Tunnel
between an ingress and egress FICON port.
For HP StorageWorks M-series directors (6140 and i10K directors), implement the Allow/Prohibit
One Ethernet interface, one IP route and one FCIP tunnel between sites
You can ensure a determinate path for FICON commands and responses by configuring only one Ethernet
connection between the 400 MP Router SAN routers or B-Series Multi-Protocol Router Blades using only
one IP route and one FCIP tunnel.
Traffic isolation zoning
The Traffic Isolation feature may be used to control the flow of interswitch traffic through the 400 MP Router
SAN router or B-Series Multi-Protocol Router Blade VE_Port or E_Port connections. This feature can be used
with Allow/Prohibit settings on M-series directors to create complete flow through paths between end
points connected through M-series and Fabric OS products. Traffic isolation uses a special zone, called a
traffic isolation (TI zone), to create dedicated paths for specific traffic. You can create a TI zone from either
the command line, as described in
Allow/Prohibit for M-series directors
The Allow/Prohibit feature is available on the Mi10k and 6140 M-series directors. This feature enables you
to control traffic flow between F_Ports and E_Ports. It is implemented from the Mi10K or M6140 Director
Element Manager GUI through use of an Allow/Prohibit matrix. The matrix allows you to block (prohibit)
specific F_Port to E_Port connections. You can create a determinate data path by blocking all F_Port to
E_Port connections except the one you want to use for FICON traffic.
allow/prohibit matrix. The F_Port addresses are in the vertical column to the left, and the E_Port addresses
are in a horizontal row at the top. In the portion shown, F_Port address 04 can connect to E_Port 07. All
other connections are prohibited, as indicated by the universal prohibited symbol.
See the Brocade Mi10K or M6140 Director Element Manager User Manual for specific information about
implementing the allow/prohibit feature.
FICON emulation concepts and features
FICON emulation supports FICON traffic over IP WANs using FCIP as the underlying protocol. FICON
emulation can be extended to support performance enhancements for specific applications through use of
the following licensed features.
Tape write pipelining
Tape read pipelining
514 Configuring and monitoring FICON Extension Services
"Installing and maintaining
firmware" on page 213, or from Web Tools.
shows a portion of the