Off-Line Drive Diagnostics And Replacement - Sun Microsystems StorEdge T3 Service Manual

8. If replacing the u1 controller card does not correct the problem, replace the u2
RAID controller in the u2 enclosure.
9. If replacing the two RAID controllers does not correct the problem, proceed to
replacing disk drives as described in the next section.
8.4.3

Off-Line Drive Diagnostics and Replacement

If replacing the interconnect and RAID controller cards does not resolve the loop 1
(path 0) problem, the next step is to test, and if necessary replace, any suspect disk
drives.
The test to use is the ofdg off-line diagnostic utility. The ofdg diagnostic requires
the Sun StorEdge T3 array partner group to be removed from host access. This is a
highly disruptive procedure that stops all data access to the disk tray. Coordinate
and schedule this down time with the customer.
This test also requires that Component Manager halt all polling to the Sun StorEdge
T3 array. Because HTTP polling by Component Manager is blocked during the
course of this test, Component Manager may report rejected requests or other
problems.
To administer and monitor the test, connect a serial maintenance cable and open a
Tip session to the Sun StorEdge T3 and T3+ array.
The following steps describe how to test for the above example of a suspected loop
1 (path 0) problem.
Note – Before running the ofdg utility, all disks other than those located in the u1
tray must be assigned to a LUN. Problems may occur if ofdg is run on systems
where non u1 disks have not been assigned to volumes.
1. Make sure that all disks other than u1 are assigned to a LUN.
2. Quiesce all I/O going to all volume(s) in that disk array and associated partner
group.
Notify all applications to stop accessing any affected volumes. This may require
stopping the application.
Verify that all drive activity has stopped. The solid green drive activity LEDs
indicate that the drives are idle.
Chapter 8 Diagnosing and Correcting FC-AL Loop Problems 8-23