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February 23rd, 2016 14:00
Controller Configuration
Hi,
I have a question about the configuration of 2 controller on PS4100 SAN. I see the second controller is in standby mode for failover. I want to put 2 controller in ACTIVE MODE to get 4gigabytes of bandwith. Do you have any idea how to proceed???
i have hp msa1040 and the 2 controller is ACTIVE!
Thank you!
Sébastien
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Origin3k
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February 23rd, 2016 15:00
Hello Sébastien,
a EQL PS is always Active/Standby which means the Standby controller offer the the following
- CPU
- Cache
but no network as long as the Active CM (Controller Module) is up and running. With rescent models there is "vertical portfailover" which means also the network of a standby CM become online but thats only when there i a problem with network/switch of the active CM. And this feature doesnt help you with your question.
A PS with 2 CMs is always a little bit faster as a one with only a single CM.
Storages like HP MSA 2040, Dell Powervault MD and so on are Active/Active on paper but a LUN is always bind to a single Controller.
Install EQL SANHQ to monitor the bandwith and most likely you will see that in a typical production environment youre unable to fill the 2Gbit. This may change during Backup or other sequential workloads with larger IO sizes.
Regards,
Joerg