HP A7533A HP StorageWorks Fabric OS 5.X Procedures User Guide (AA-RVHWB-TE, Se - Page 108
Configuring switches, Preparing a switch, Configuring a single switch
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Configuring switches This section describes how to configure a switch in a FICON environment. Use the worksheet shown in Figure 3 on page 119 to record your configuration information. The following are recommended FICON environment configuration settings: • Disable DLS (dlsReset command). If DLS is enabled, traffic on existing ISL ports might be affected when one or more new ISLs are added between the same two switches. Specifically, adding a new ISL might result in dropped frames as routes are adjusted to take advantage of the bandwidth provided. By disabling DLS, you ensure that there are no dropped frames. A similar situation occurs when an ISL port is taken offline and then brought back online. When the ISL port goes offline, the traffic on that port is rerouted to another ISL with a common destination. When the ISL port comes back online and DLS is enabled, the rerouting of traffic back to the ISL port might result in dropped frames. If DLS is not enabled, traffic is not routed back. • Configure ports that are connected to 1-Gbit/sec channels for fixed 1-Gbit/sec speed. Otherwise, when using fixed 1-Gbit/sec channels (both G5 and FICON Express), the FICON host might generate erroneous link incidents when the channels are coming online. These link incidents result in a Call Home. Other than the generated link incident, the channel comes online and functions normally. • Enable in-order delivery (iodSet command). • Enable VC translation link initialization on extended fabrics links, to stabilize them. See "For dynamic long-distance links, you can approximate the number of buffer credits using the following formula:" on page 165 for details on this option of the portCfgLongDistance command. • Although there are no specific zoning rules related to FICON environments, HP recommends that you follow standard FCP zoning practices. For management purposes, put FCP devices in one zone and FICON devices in another zone when operating in a mixed environment. Preparing a switch To verify that a switch is ready to be used in a FICON environment, complete the following steps: 1. Connect to the switch and log in as admin. 2. If the switch is not in a cascaded environment, proceed to step 3. If the switch is in a FICON cascaded environment, issue the following commands: • licenseShow to verify that required licenses (Secure Fabric OS and Zoning) are activated. • secModeShow to determine whether Secure Fabric OS is enabled; if it is disabled, enable it. • secPolicyShow to verify that the SCC_POLICY is active. 3. Issue switchShow to verify that the switch and devices are online. 4. Issue ficonshow rnid to verify that the FICON devices are registered with the switch. 5. Issue ficonshow lirr to verify that the FICON host channels are registered to listen for link incidents. 6. Optional: To use FICON CUP, see "Using FICON CUP" on page 111. Configuring a single switch Single-switch configuration does not require IDID or fabric binding, provided that connected channels are configured for single-byte addressing. However, configure IDID to ensure that domain IDs are maintained. 108 Administering FICON fabrics