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2 Sun StorEdge 3900 and 6900 Series 2.0 Troubleshooting Guide • March 2003
Sun Proprietary/Confidential: Internal Use Only
Predictive Failure Analysis (PFA)
Capabilities
The Storage Automated Diagnostic Environment software provides the health and
monitoring functions for the Sun StorEdge 3900 and 6900 series systems. This
software provides the following predictive failure analysis (PFA) capabilities:
■ FC links—Fibre Channel (FC) links are monitored at all end points using the
Fibre Channel-Extended Link Service (FC-ELS) link counters. When link errors
surpass the threshold values, an alert is sent. This enables Sun-trained personnel
to replace components that are experiencing high transient fault levels before a
hard fault occurs.
■ Enclosure status—Many devices, like the Sun StorEdge FC switch-8 and switch-
16 switch and the Sun StorEdge T3+ array, cause the Storage Automated
Diagnostic Environment alerts to be sent if the temperature thresholds are
exceeded. This enables Sun-trained personnel to address the problem before the
component and enclosure fails.
■ Single Point-of-Failure (SPOF) notification—Storage Automated Diagnostic
Environment notification for path failures and failovers (that is, Sun StorEdge
Traffic Manager software failover) can be considered a PFA method, since Sun-
trained personnel are notified and can repair the primary path. This eliminates
the time of exposure to SPOF and helps to preserve customer availability during
the repair process.
PFA is not always effective in detecting or isolating failures. The remainder of this
document provides guidelines that you can use to troubleshoot problems that occur
in supported components of the Sun StorEdge 3900 and 6900 series.