Cache Memory Mismatch

What Caused the Problem?

This problem can result from two situations:

  1. The two controllers have different sizes of total installed cache memory. For example, Controller A has 2GB of total cache memory and Controller B has 4GB of total cache memory.
  2. There is a mismatch in the attributes of the cache memory between the two controllers (such as the buffer layout version, raw pool sizes, or EDC enabled values).

Important Notes

Recovery Steps

1 Record the total cache memory size for each controller:
a Select the Storage Subsystem >> View >> Profile menu option.
b Click the Controllers tab.
c Scroll down and locate the "total data cache" field for each controller.
d
If... Then...
The total cache memory sizes for the controllers are different Go to step 2.
The total cache memory sizes for the controllers are the same You will need assistance from your technical support representative to resolve this problem.
  1. Select the Advanced >> Troubleshooting >> Support Data >> Collect menu option from the Subsystem Management Window (AMW), and take the appropriate steps to save the support data to a .zip file.
  2. Contact your technical support representative and indicate that an "Cache Memory Size Mismatch" problem is being reported. Send the file you saved to your representative and wait for further instruction.

Do not continue with the remaining Recovery Steps.

2
If... Then...
You know which controller you want to remove from the storage subsystem (in other words, the controller that has the cache memory size you DO NOT want to keep) Go to step 3.
You do NOT know which controller you want to remove from the storage subsystem You will need assistance from your technical support representative to resolve this problem.
  1. Select the Advanced >> Troubleshooting >> Support Data >> Collect menu option from the Subsystem Management Window (AMW), and take the appropriate steps to save the support data to a .zip file.
  2. Contact your technical support representative and indicate that an "Cache Memory Size Mismatch" problem is being reported. Send the file you saved to your representative and wait for further instruction.

Do not continue with the remaining Recovery Steps.

3 Obtain a replacement controller that has the same sub-model and memory size as the controller you are leaving in the storage subsystem.
4 Complete the following steps for the controller you want to remove:
a
Select the controller in the Physical View of the Subsystem Management Window.
b
Select Advanced >> Recovery >> Place Controller >> Offline.
c
Complete the instructions in the dialog, then select Yes.
5 Read all of the following steps before taking any action.
a Click the Recheck button to rerun the Recovery Guru.
b Select the Offline Controller problem that is being reported in the Summary area.
c Complete the Recovery Steps in the Offline Controller to replace the controller.
6 Click Recheck 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.