EMM Hardware Type Mismatch

What Caused the Problem?

A expansion enclosure in the storage array contains EMM modules with different hardware (such as a mixture of switched and non-switched EMMs or a SATA EMM and a Fibre Channel EMM). 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

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.
Both EMM modules in the same expansion enclosure must be of the same hardware type and have the same firmware version.
The EMM modules should contain a label to differentiate between the different hardware types. Make sure that the label on both EMMs match when you replace one of the EMM modules.
An EMM module hardware type mismatch can affect how the storage array reports existing disk groups and virtual disks (some of them may not display).

Recovery Steps

The EMM firmware and hardware information is available in the Storage Array Profile.

a	Refer to the Recovery Guru Details area to see which expansion enclosure is affected by the mismatch.
b	Access the Storage Array Profile and then select the Enclosure information.
c	Scroll down until you find the following heading: Expansion Enclosure x Overall Component Information where x is the expansion enclosure number listed in the Recovery Guru Details area.
d	Under each EMM Module subheading, locate and record the following information for each EMM (left and right): Firmware version: Product ID: Part number:

If...

Then...

You do NOT have a replacement EMM module or are unable to determine if you have a replacement EMM module with the same firmware version and hardware type as one of the modules in the affected enclosure

Contact your technical support representative.

You have a replacement EMM module with the same firmware version and hardware type as the module that will remain in the affected enclosure

Read the following notes and then perform the procedure:

Make sure you have determined which EMM module should remain in the expansion enclosure.
Make sure that the replacement EMM module is the same as the EMM that will remain in the expansion enclosure (hardware type and firmware version).
Wait approximately 40 seconds before inserting a replacement EMM module.
Wait 10 seconds for the storage array to detect and register the replacement EMM module.

Remove one of the EMM modules in the affected enclosure and insert a replacement EMM. Then, go to step 3.

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.