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44 Sun StorEdge 3900 and 6900 Series Troubleshooting Guide • March 2002
CODE EXAMPLE 3-8 Failed Path marked “unusable”
FRU tests available for the A4/B4 FC Link
Segment
■ The switchtest can only be run from the Storage Service Processor
■ The linktest will be able to isolate the switch and the GBIC on the switch. It
will not be able to isolate the cable or the Sun StorEdge T3+ array controller.
▼ To Isolate the A4/B4 FC Link
1. Quiesce the I/O on the A4/B4 FC link path.
2. Run linktest from the Storage Automated Diagnostic Environment GUI to
isolate suspected failing components.
Alternatively, follow these steps:
1. Quiesce the I/O on the A4/B4 FC link path.
2. Run switchtest to test the entire link (re-create the problem).
3. Break the connnection by uncabling the link.
4. Insert the loopback connector into the switch port.
# cfgadm -al
Ap_Id Type Receptacle Occupant Condition
ac0:bank0 memory connected configured ok
ac0:bank1 memory empty unconfigured unknown
c1 scsi-bus connected configured unknown
c16 scsi-bus connected unconfigured unknown
c18 scsi-bus connected unconfigured unknown
c19 scsi-bus connected unconfigured unknown
c1::dsk/c1t6d0 CD-ROM connected configured unknown
c20 fc-private connected unconfigured unknown
c21 fc-fabric connected configured unknown
c21::50020f2300006355 disk connected configured unusable