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62 Sun StorEdge 3900 and 6900 Series 2.0 Troubleshooting Guide • March 2003
Sun Proprietary/Confidential: Internal Use Only
Verifying the Data Host
A problem in the A4 or B4 FC Link appears differently on the data host, depending
on whether the array is a Sun StorEdge 3900 series or a Sun StorEdge 6900 series
device.
Sun StorEdge 3900 Series
In a Sun StorEdge 3900 series device, the data host multipathing software is
responsible for initiating the failover and reports it in /var/adm/messages, such
as those reported by the Storage Automated Diagnostic Environment email
notifications.
The luxadm failover command is used to fail the Sun StorEdge T3+ array LUNs
back to the proper configuration after the failing FRU is replaced. This command is
issued from the data host.
Sun StorEdge 6900 Series
In a Sun StorEdge 6900 series device, the virtualization engine pairs handle the
failover and the failover is not noted on the data host. All paths remain online and
active.
The failbackt3path command is used, and is issued from the Storage Service
Processor.
Note – In the event of a complete sw1b or sw2b failure in a Sun StorEdge 6900
series configuration, the virtualization engine pairs handle the failover. In addition,
the multipathing software notes a path failure on the data host, the Sun StorEdge
Traffic Manager or DMP software takes the entire path that was connected to the
failed switch offline, and the Inter-Switch Link (ISL) ports on the surviving switch
go offline as well.