You can use these recommended configuration settings for your Emulex adapter on a PRIMEPOWER host system.
Table 1 provides a list of recommended parameters and setting for the Emulex LP9002L adapter.
| Parameters | Recommended settings |
|---|---|
| automap | 1: Default. SCSI IDs for all FCP nodes without persistent bindings are automatically generated. If new FCP devices are added to the network when the system is down, there is no guarantee that these SCSI IDs will remain the same when the system is restarted. If one of the FCP binding methods is specified, then automap devices use the same mapping method to preserve SCSI IDs between link down and link up. If no bindings are specified, a value of 1 forces WWNN binding, a value of 2 forces WWPN binding, and a value of 3 forces DID binding. If automap is 0, only devices with persistent bindings are recognized by the system. |
| fcp-on | 1: Default. Turn on FCP. |
| lun-queue-depth | 30: The default value that the driver uses to limit the number of outstanding commands per FCP LUN. This value is global, affecting each LUN recognized by the driver, but can be overridden on a per-LUN basis. You might have to configure RAID using the per-LUN tunable throttles. |
| no-device-delay | 0: Default. Implies no delay whatsoever. 1: Recommended. 2: Setting a long delay value might permit I/O operations to build up, each with a pending timeout, which could result in the exhaustion of critical PRIMEPOWER kernel resources. In this case, you might see a fatal message such as, PANIC: Timeout table overflow. |
| network-on | 0: Default. Recommended for fabric. Do not turn on IP networking. 1: Turn on IP networking. |
| scan-down | 0: Recommended. Causes the driver to use an inverted ALPA map, effectively scanning ALPAs from high to low as specified in the FC-AL annex. 2: Arbitrated loop topology. |
| tgt-queue-depth | 0: Recommended. The default value that the driver uses to limit the number of outstanding commands per FCP target. This value is global, affecting each target recognized by the driver, but can be overridden on a per-target basis. You might have to configure RAID using the per-target tunable throttles. |
| topology | 2: Recommended for fabric. Point-to-point topology only. 4: Recommended for nonfabric. Arbitrated-loop topology only. |
| xmt-que-size | 256: Default. Size of the transmit queue for mbufs (128 - 10240). |
| zone-rscn | 0: Default. 1: Recommended for fabric. Check the name server for RSCNs. Setting zone-rscn to 1 causes the driver to check with the name server to see if an N_Port ID received from an RSCN applies. If soft zoning is used with Brocade fabrics, this parameter should be set to 1. |