Chapter 7
Troubleshooting
51
The
Reads
and
Writes
outputs show the number of these operations that have occurred since the statistic was last
reset, or since the controller was restarted.
Record the numbers displayed.
2. Run the
show disk-group-statistics
command a second time.
This provides you a specific window of time (the interval between requesting the statistics) to determine if data is
being written to or read from the disk group. Record the numbers displayed.
3. To determine if any reads or writes occur during this interval, subtract the set of numbers you recorded in step 1 from
the numbers you recorded in step 2.
If the resulting difference is zero, then I/O has stopped.
If the resulting difference is not zero, a host is still reading from or writing to this disk group. Continue to stop I/O
from hosts, and repeat step 1 and step 2 until the difference in step 3 is zero.
Diagnostic steps
This section describes possible reasons and actions to take when an LED indicates a fault condition during initial
system setup. See
for descriptions of all LED statuses.
In addition to monitoring LEDs via line-of-sight observation of racked hardware components when performing
diagnostic steps, you can also monitor the health of the system and its components using the management interfaces.
Be mindful of this when reviewing the Actions column in the diagnostics tables, and when reviewing the step
procedures provided in this chapter.
Is the enclosure front panel Fault/Service Required LED amber?
Answer
Possible reasons
Actions
No
System functioning properly.
No action required.
Yes
A fault condition exists/occurred.
If installing an I/O module FRU, the module
has not gone online and likely failed its
self-test.
l
Check the LEDs on the back of the controller enclosure to narrow
the fault to a FRU, connection, or both.
l
Check the event log for specific information regarding the fault.
Follow any recommended actions.
l
If installing an IOM FRU, try removing and reinstalling the new
IOM, and check the event log for errors.
l
If the above actions do not resolve the fault, isolate the fault and
contact an authorized service provider for assistance. Replacement
may be necessary.
Table 7 Diagnostics LED status: Front panel "Fault/Service Required"
Is the enclosure rear panel FRU OK LED off?
This table pertains to the controller module FRU OK LED (not the PCM OK LED).
Answer
Possible reasons
Actions
No
System functioning properly.
No action required.
Blinking
System is booting.
Wait for the system to boot.
Yes
The controller module is not powered
on.
The controller module has failed.
l
Verify the controller module is fully inserted and latched in place,
and that the enclosure is powered on.
l
Check the event log for specific information regarding the failure.
Table 8 Diagnostics LED status: Rear panel "FRU OK"