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

Question

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!

TMACMD · Accepted Answer

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