Dell PowerConnect Brocade 300 Fabric OS Administrator's Guide v7.1.0 - Page 53
Duplicate Port World Wide Name, Device recovery, High availability of daemon processes
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High availability of daemon processes 1 Duplicate Port World Wide Name According to Fibre Channel standards, the Port World Wide Name (PWWN) of a device cannot overlap with that of another device, thus having duplicate PWWNs within the same fabric is an illegal configuration. If a PWWN conflict occurs with two devices attached to the same domain, Fabric OS handles device login in such a way that only one device may be logged in to the fabric at a time. For more information, refer to "Duplicate PWWN handling during device login" on page 109. If a PWWN conflict occurs and two duplicate devices are attached to the fabric through different domains, the devices are removed from the Name Server database and a RASlog is generated. Device recovery To recover devices that have been removed from the Name Server database due to duplicate PWWNs, the devices must re-login to the fabric. This is true for any device-for example, a device on an F_Port, NPIV devices, or devices attached to a switch in Access Gateway mode. High availability of daemon processes Starting non-critical daemons is automatic; you cannot configure the startup process. The following sequence of events occurs when a non-critical daemon fails: 1. A RASlog and AUDIT event message are logged. 2. The daemon is automatically started again. 3. If the restart is successful, then another message is sent to RASlog and AUDIT reporting the successful restart status. 4. If the restart fails, another message is sent to RASlog and no further attempts are made to restart the daemon. Schedule downtime and reboot the switch at your convenience. Table 1 lists the daemons that are considered non-critical and are automatically restarted on failure. TABLE 1 Daemon Daemons that are automatically restarted Description arrd cald raslogd rpcd snmpd traced trafd Asynchronous Response Router, which is used to send management data to hosts when the switch is accessed through the APIs (FA API or SMI-S). Common Access Layer daemon, which is used by manageability applications. Reliability, Availability, and Supportability daemon logs error detection, reporting, handling, and presentation of data into a format readable by you and management tools. Remote Procedure Call daemon, which is used by the API (Fabric Access API and SMI-S). Simple Network Management Protocol daemon. Trace daemon provides trace entry date and time translation to Trace Device at startup and when date/time changed by command. Maintains the trace dump trigger parameters in a Trace Device. Performs the trace Background Dump, trace automatic FTP, and FTP "aliveness check" if auto-FTP is enabled. Traffic daemon implements Bottleneck detection. Fabric OS Administrator's Guide 53 53-1002745-02
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