Failed EMM Module

What Caused the Problem?

An EMM module has failed in a expansion enclosure. The Recovery Guru Details area provides specific information you will need as you follow the recovery steps.

Caution: Possible loss of data accessibility. Do not remove a component when either (1) the Service action (removal) allowed (SAA) field in the Details area of this recovery procedure is NO (), or (2) the SAA LED on the affected component is OFF (note that some products do not have SAA LEDs). Removing a component while its SAA LED is OFF may result in temporary loss of access to your data. Refer to the following Important Notes for more detail.

Caution: Electrostatic discharge can damage sensitive components. Always use proper antistatic protection when handling components. Touching components without using a proper ground may damage the equipment.

Important Notes

Although the expansion enclosure is still operational, you should correct this failure as soon as possible. If the other EMM module or its communication path fails, all I/O to that expansion enclosure will fail.
In some cases, if both modules have failed, the physical disks in the expansion enclosure will be automatically spun down (failed) to avoid potential damage to the physical disks. If the physical disks are spun down, the Recovery Guru may also report physical disk, virtual disk, and channel failures. However, do NOT use the associated procedures for these reported failures. Instead, contact your technical support representative.
For some failures, the fault indicator light on an EMM module will not be on.
There are several conditions which may cause loss of communication with the EMM module. Use your hardware manual to help diagnose the problem.
Both EMM modules in the same expansion enclosure must have the same firmware version and be of the same hardware type.
The EMM modules should contain a label to differentiate between the different hardware types. Make sure that the labels on both EMMs match if you need to replace one of the EMM modules.
Service Action Allowed Important Information:
- The Service action (removal) allowed field in the Details area indicates whether or not you can safely remove the component. If the SAA field is NO (), then the affected component must remain in place until you service another component first.
- The Service action LED on Component field in the Details area indicates whether or not a physical SAA LED is present on the hardware component. This field does NOT indicate whether the LED is ON or OFF (that indication is provided by the Service action (removal) allowed field).
- If a component does not have an SAA LED, then it is OK to remove the component when its fault LED is lit and the Service action (removal) allowed field = YES () in the Details area.
- The Service action (removal) allowed field shown in the Details area and the physical SAA LED on the hardware component (if supported) MUST match before you remove the affected component. In rare cases (such as multiple problems), the status of the LED and the SAA field may not match. If there is a mismatch, then you should NOT remove the component until these indications match.

Recovery Steps

If...	Then...
You see virtual disk failures, channel failures or unassigned physical disk failures associated with the expansion enclosure reporting the failed EMM module	Contact your technical support representative. DO NOT perform steps 2 - 9. Caution: Risk of Data Loss. Recovery from a failed EMM module with associated virtual disk and physical disk failures is a complicated procedure that if done incorrectly, could result in the loss of data. Therefore, you should not attempt to perform any recovery steps without the help of your technical support representative.
You DO NOT see virtual disk failures, channel failures or unassigned physical disk failures associated with the expansion enclosure reporting the failed EMM module	Go to step 2.

Check to make sure there is power to the expansion enclosure and that the external physical disk cables are secure.

Caution: Risk of Data Loss. Disconnecting expansion enclosure cables to the remaining optimal EMM module while I/O is in progress can cause data loss!

If...	Then...
There is a problem with the power or physical disk cables	Correct the problem, then go to step 9.
The power and physical disk cables are OK	Go to step 3.

Refer to the Details area to identify the failed EMM.

Caution: Risk of Data Loss. Make sure you correctly identify the failed module. If you have two modules, removing the remaining optimal module while I/O is in progress can cause loss of access to data!

Reseating the affected EMM module may clear the failure being reported. While the cables are still connected to the module, remove the module from the expansion enclosure, wait 10 seconds, and re-insert the module firmly. Wait 40 seconds, then click the Recheck button to rerun the Recovery Guru to ensure the failure has been fixed.

If...	Then...
This failure is no longer reported in the Summary area	You are finished with this procedure.
A failed EMM module is still reported	Go to step 5.

If...

Then...

The cables are connected directly to the EMM module

Label each cable to ensure that they are properly reconnected when the EMM module is replaced.

Remove the cables.

Go to step 6.

The cables are connected to an interface transceiver such as an SFP

Label each interface transceiver to ensure that they are properly reconnected when the EMM module is replaced.

Leave the cables connected and remove the interface transceivers from the EMM module.

Go to step 6.

Replace the failed EMM module. Make sure that the replacement module is the same as the module that is remaining in the expansion enclosure (hardware type and firmware version).

Using the labels created in step 5, reconnect the cables to the replaced module. Wait 40 seconds, then go to step 8.

Click the Recheck button to rerun the Recovery Guru. The failure should no longer appear in the Summary area. If the failure appears again, contact your technical support representative.