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Fabric OS Administrator’s Guide 53
53-1002745-02
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 Daemons that are automatically restarted
Daemon Description
arrd 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).
cald Common Access Layer daemon, which is used by manageability applications.
raslogd Reliability, Availability, and Supportability daemon logs error detection, reporting, handling, and
presentation of data into a format readable by you and management tools.
rpcd Remote Procedure Call daemon, which is used by the API (Fabric Access API and SMI-S).
snmpd Simple Network Management Protocol daemon.
traced 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.
trafd Traffic daemon implements Bottleneck detection.