Sun Microsystems StorEdge 6900 Series - Manual (Page 58)

42 Sun StorEdge 3900 and 6900 Series Troubleshooting Guide • March 2002
▼ To Verify the Data Host
A problem in the A4/B4 FC Link appears differently on the data host, depending on
if the array is a Sun StorEdge 3900 series or a Sun StorEdge 6900 seriesdevice.
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 would remain
ONLINE and ACTIVE.
The mpdrive failback 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, Sun StorEdge Traffic
Manager or VxDMP takes the entire path that was connected to the failed switch
offline, and the ISL ports on the surviving switch go offline as well.