HPE EVA Storage

Help wiring MSA 2040 to 2040 disk shelf

 
foodandbikes
Advisor

Help wiring MSA 2040 to 2040 disk shelf

Hello,

This is my first experince with the MSA product, so please bear with my ignorance.

 

The customer ordered a MSA 2040 chassis with a single controller, and also a MSA 2040 shelf with 2 controllers.

From all the diags I am seeing, it looks like all shelves/chassis should have the same number of controllers. When wiring them together do I just run a cable from the OUT SAS port on the chassis, to the IN SAS port on the top controller on the shelf?

6 REPLIES 6
Torsten.
Acclaimed Contributor

Re: Help wiring MSA 2040 to 2040 disk shelf

if there is a single array controller only, you can only connect a single expansion controller.

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Hope this helps!
Regards
Torsten.

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foodandbikes
Advisor

Re: Help wiring MSA 2040 to 2040 disk shelf

Thanks for the info.

So it souds like I won't be connecting anything into the second controller on the disk shelf. Now I have to wonder why it was ordered/sold this way.

Torsten.
Acclaimed Contributor

Re: Help wiring MSA 2040 to 2040 disk shelf

you need 2 array controllers for better performance and redundency.

Hope this helps!
Regards
Torsten.

__________________________________________________
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those who understand binary, and those who don't.

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foodandbikes
Advisor

Re: Help wiring MSA 2040 to 2040 disk shelf

Thanks.
If the disk shelf has 2 controllers, but the main chassis has 1, is there any benefit of having the second controller in the disk shelf?
I'll suggest getting a second controller for the chassis, but if they choose not to is the second controller in the disk shelf doing anything?
Torsten.
Acclaimed Contributor

Re: Help wiring MSA 2040 to 2040 disk shelf

no, it is almost useless.

but maybe 99% of all arrays have dual controllers ...

Hope this helps!
Regards
Torsten.

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those who understand binary, and those who don't.

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foodandbikes
Advisor

Re: Help wiring MSA 2040 to 2040 disk shelf

Great, thanks for the help.