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4-ports SAS Host Adapter, which two ports should be used to create a stack

I have following adapter, and if I create a stack of disk/shelf (ds224-12), among 4a/4b/4c/4d, which two ports should be used to create the stack and why?

MFG Part Number: NetApp, Inc. 110-00401 rev. B0
Part number: 111-02026+B0

 

Thanks!

2 REPLIES 2

Re: 4-ports SAS Host Adapter, which two ports should be used to create a stack

Hi

 

see pages 17-53 on the SAS cabeling guide

https://library.netapp.com/ecm/ecm_get_file/ECMM1280392

 

Gidi

Re: 4-ports SAS Host Adapter, which two ports should be used to create a stack

If you ONLY have a single 4-port adapter, then you use

4a/4d Stack 1

4b/4c Stack 2

 

The card has two ASICs on it. One controls ports a/b and the other ports c/d.

This way is one asic fails, the stack does not.

 

Now, referring to the cable guide if you have more than 4-ports, you should use ports from all sources.

slots 0  and 4 for instance, you would/should do:

 

0a / 4b

4a / 0d 

0c / 4d 

4c / 0b

 

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