Fabric Watch Administrator's Guide v6.4.0 (53-1001770-01, June 2010)

57
Chapter
7
Port Monitoring
In this chapter
•Port class areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
•Port class guidelines and default settings. . . . . . . . . . . . . . . . . . . . . . . . . . . 59
•Port configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
•portThConfig command procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
•Port fencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
•Recommended port configuration settings . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Port class areas
Table 14 lists and describes the Fabric OS v6.4.0 areas in the Port class. Configure the Port class
using the portThConfig command. You can find port setting guidelines and specific examples of
portThConfig configuration later in this chapter.
NOTE
Fabric Watch monitors and reports the status of physical and virtual FC ports. Physical GbE ports
and ISCSI ports are not monitored and are not included in the Port Class area.
TABLE 14 Port class areas
Area Indicates
CRC The number of times an invalid cyclic redundancy check error occurs on a port or
a frame that computes to an invalid CRC. Invalid CRCs can represent noise on the
network. Such frames are recoverable by retransmission. Invalid CRCs can
indicate a potential hardware problem.
ITW The number of times an invalid transmission word error occurs on a port. A word
did not transmit successfully, resulting in encoding errors. Invalid word messages
usually indicate a hardware problem.
C3TX_TO The number of Class 3 discards frames because of timeouts.
Link loss The number of times a link failure occurs on a port or sends or receives NOS.
Both physical and hardware problems can cause link failures. Link failures also
frequently occur due to a loss of synchronization or a loss of signal.
Signal loss The number of times that a signal loss occurs in a port. Signal loss indicates that
no data is moving through the port. A loss of signal usually indicates a hardware
problem.
Note: Loss of signal count still displays using the fwConfigure command, but it is
no longer supported.