Service Manual
JetStor SAS 742F
8
Problem
What to do / What to Replace
The RAID subsystem does not
start up properly. Both RAID
controllers are in Faulty state
(Fault LED is blinking red).
1. Check the cable of Switch Mechanism in
both RAID controllers, if cable is properly
connected. Refer to Section 4 Step D.
2. To verify if the 2 RAID controllers are
working fine, power off the enclosure,
disconnect the cable of Switch Mechanism
in both RAID controllers, and then power
on the enclosure. If both controllers are
working fine, then the problem is in the
Switch Mechanism. Refer to Section 6 on
how to replace the switch mechanism.
3. Make sure none of the 4 expander
modules are failed (when Fault LED is
red). If so, check or replace the failed
expander module. Refer to Section 10.
4. If all 4 expander modules are good, verify
if each individual RAID controller is
working fine. Power off the enclosure,
remove one RAID controller and the
corresponding 2 expander modules, power
on, and check if the single RAID controller
can work fine. Then repeat the test to
check the other RAID controller in single
controller mode. If both RAID controllers
can work in single controller mode, then
the problem could be with the switch
mechanism. Check or replace the switch
mechanism. Refer to Section 6.
5. If switch mechanism has been replaced
but controller still fails, remove and
reinsert the RAM module, or try to replace
with a new one. Refer to Section 5.
6. If the cable of switch mechanism are
disconnected in both RAID controllers, all
4 expander modules are good, and one or
both RAID controllers fail, replace the
failed RAID controller(s). Refer to Section
4.
