Brocade Network Advisor SAN User Manual v12.3.0 - Manual (Page 1007)

Brocade Network Advisor SAN User Manual 955
53-1003154-01
Connecting cascaded FICON fabrics over FCIP
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Configuring DWDM links to use R_RDYs
TDM requires that you configure DWDM links to use R_RDYs and not VC_RDYs. The only way to turn
off VC_RDYs is to start with QoS “OFF,” and then turn on ISL R_RDY mode. Execute the following
Fabric OS commands on E_Ports (ISL connections).
1. Enter the following command to disable credit recovery on a port.
portcfgcreditrecovery --disable slot/port speed
2. Enter the following command to set the speed for the link. Only speeds supported by the
installed SFP are supported. Use 0 to set back to automatic sensing mode.
portcfgspeed slot/port speed
3. Enter the following command to disable QoS.
portcfgqos --disable slot/port
4. Enter the following command to enable ISL R_RDY mode.
portcfgislmode slot/port, 1
5. Enter the following command to disable trunking on the port.
portcfgtrunkport slot/port, 0
6. Enter the following command to display port settings:
portcfgshow
Extending RDR applications over FCIP
This section provides considerations for configuring tunnels and circuits when extending remote
data replication (RDR) applications over FCIP.
When to enable Fast Write
Enabling Fast Write depends on the application that you are extending over FCIP. Use the following
table to determine if Fast Write should be enabled for a tunnel configuration. Enable Fast Write
through the FCIP Tunnel Advanced Settings dialog box. Access this dialog box by selecting
Advanced Settings on the Add FCIP Tunnel dialog box.
TABLE 77 Using Fast Write for extended applications
Manufacturer RDR Application Platform Type Use Fast Write
IBM Global Mirror (PPRC) DS Async No
IBM Metro Mirror DS Sync No
IBM XIV XIV Sync Yes
IBM Global Mirror SVC Async No
IBM Metro Mirror SVC Sync No
EMC SRDF/A Symmetrix Async Yes
EMC SRDF/S Symmetrix Sync Yes (SiRT disabled)
EMC SRDF Adaptive Copy Symmetrix Async Yes
EMC MirrorView CLARiiON Async Yes