Disabling Mirrored cache AND/OR Redundant Controller in STK 2540

Hi,
We have a dual controller STK 2540. Wanted to know if there is a way to disable cache mirroring (also called cache synchronization)? This is to test the impact of 1/3 loss of performance when cache is mirrored to protect cached data in the event of controller failure in a dual-active controller configuration.
I searched thorugh entire CAM and could not find an option.
Also would like to know how to confirm whether the controller is in redundant mode or Active-Passive mode. CAM does not show this as well.
Is CLI the only option to view/modify the above mentioned configuration? If so, please let me know what command should we use to view and modify the same.
Thanks.

RW_DB_Arch wrote:
Thanks nwi.
I have seen the 'Active' status for both controllers from the CAM interface as well from the sscs output. That is fine, but I think I did not put across my question very correctly.
According to my understanding, if the cache is mirrored/synchronized then it will impose an approx. 33% of performance degradation. And I want to do away with that. So,
I want to view the redundancy mode of controllers i.e. whether they are running in non-redundant mode or redundant mode. In either mode, both will be active.
I also want to view the mirroring mode of the cache i.e. whether the cache is mirrored or not mirrored. In either mode, full 1Gb cache will be used.
The controller will always be in redundant mode, you cannot change this. They will be active/active, if any controller is passive this means that it doesn't service I/O and the volumes won't failover in case there is a problem with the active one.
You can however disable the cache mirroring between both controllers, that said, this is something we really do not recommend to do. Imagine you disable the mirroring, now one controller reboots (because this is something that may happen as per design to protect the data in specific situations), you will lose the data in the cache for this controller, this is the data which is not flushed to the drives.
And then I want to achieve the foll. configuration:
2 controllers, both active, but in non-redundant mode.You cannot do that. With the ST2500 like the ST6000 the controller are redundant each other.
Which also means that cache mirroring/synchronization is off. So something like this: 2 volumes - vol1 has Controller A as the owning/preferred controller and vol2 has Controller B as the
owning/preferred controller. Since controller redundancy is off, I believe, if 1 of the controller fails then the volume cannot be accessed via the surviving controller (i.e. no failover to the surviving
controller) and I am fine with it. But I will get better performance because of the non-mirroring mode of cache.Such non redundant configuration isn't supported with those arrays.
Regards
>
Pls. advice.
Thanks.

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Disabling Mirrored cache AND/OR Redundant Controller in STK 2540

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