Failed EMM Module

What Caused the Problem?

An EMM module has failed in an 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 the Service Action Allowed field in the Details area of this recovery procedure is NO. Removing a component while its Service Action Allowed field is NO may result in temporary loss of access to your data. Refer to the following Important Notes and the Recovery Steps 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 EMM modules have failed, the physical disks in the expansion enclosure will automatically be 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 fix these reported failures. Instead, contact your technical support representative.
For some failures, the status LED on an EMM module will not be on.
There are several conditions which may cause loss of communication with the EMM module.
Both EMM modules in the same expansion enclosure must have the same firmware version and be 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.
The Service Action Allowed field in the Details area indicates whether you can safely remove the component. If the Service Action Allowed field is NO, then the affected component must remain in place until you service another component first.

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 through 8.

Caution: Possible loss of data accessibility. 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 accessibility. 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 cables are secure.

Caution: Possible loss of data accessibility. Disconnecting expansion enclosure cables to the remaining optimal EMM module while I/O is in progress may cause a loss of data accessibility.

If...	Then...
The power and the expansion enclosure cables are OK	Go to step 3.
There is a problem with the power or with the expansion enclosure cables	Correct the problem, then go to step 8.

Perform the following steps to identify the failed EMM module.

Caution: Possible loss of data accessibility. Make sure you correctly identify the failed EMM module. Removing the remaining optimal EMM module while I/O is in progress may cause a loss of data accessibility.

Refer to the Details area to find which expansion enclosure contains the failed EMM.

If...

Then...

The EMM module location is unknown

Contact your technical support representative to determine the location of the failed EMM module. Once you have identified the failed EMM module, go to step 4.

The EMM module location is known

Looking at the EMM modules from the back of the expansion enclosure, use the location information to identify the failed EMM module.

Go to step 4.

Check the Service Action Allowed status for the failed EMM module in the Details area.

If...	Then...
Service Action Allowed is YES	Go to step 5.
Service Action Allowed is NO	Stop this procedure and contact your technical support representative.

Reseating the affected EMM module may clear the failure being reported. To reseat, remove the EMM module from the expansion enclosure, wait 10 seconds, and re-insert the EMM module firmly. Reconnect all cables. Wait 40 seconds, then click the Recheck button to rerun the Recovery Guru.

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 6.

Replace the failed EMM module. Make sure that the replacement EMM module is the same hardware type as the EMM module that is remaining in the expansion enclosure.

Reconnect the cables to the replaced EMM 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, make sure you identified the correct EMM module as failed, correct any problems, and repeat step 8. If there is still a failed EMM module reported, contact your technical support representative.

Note: Additional information on this issue may be available. Please visit the Dell support website at support.dell.com and select your product model. Choose "troubleshooting" as your tool option, then search by this procedure title.