Sun Microsystems 6900 Quiescing the I/O on the A3 or B3 Link, # /usr/bin/vxdmpadm disable ctlr=cn

Quiescing the I/O on the A3 or B3 Link

1.Determine the path you want to disable.

2.Disable the path by typing the following:

#/usr/bin/vxdmpadm disable ctlr=<cn>

3.Verify that the path is disabled:

#/usr/bin/vxdmpadm listctlr all

Steps 1 and 2 halt I/O only up to the A3 to B3 link. I/O continues to move over the T1 and T2 paths, as well as the A4 to B4 links to the Sun StorEdge T3+ array.

Suspending the I/O on the A3 to B3 Link

Use one of the following methods to suspend I/O while the failover occurs:

■Stop all customer applications that are accessing the Sun StorEdge T3+ array.

■Manually pull the link from the Sun StorEdge T3+ array to the switch and wait for a Sun StorEdge T3+ array LUN failover.

■After the failover occurs, replace the cable and proceed with testing and FRU isolation.

■After testing is complete and any FRU replacement is finished, return the controller state back to the default by using the virtualization engine failback command.

Caution –This action will cause SCSI errors on the data host and a brief suspension of I/O while the failover occurs.

Chapter 5 Troubleshooting the Fibre Channel (FC) Links 59

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