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Should I use two LSI 9211-8i's in my file server or one 9211 with an Intel RES2SV240 expander?

Thanks for reading. I am curious about how I should expand my file server. My case supports 12 3.5" drives 8 of which I have running on an LSI 9211-8i controller. I'm ready to expand and I would like to know if I should get a second LSI 9211 and worry about expanders if I ever get a larger case or if I should add an Intel RES2SV240 expander to facilitate more drives. Is there any disadvantage to using an expander over a second controller?

Finally, if I do go with the Intel expander, should I plug both SAS cables from the 9211 into the expander or do I only need to plug in one leaving the second for a set of drives?

Thanks for your advice!
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    It goes without saying that you shouldn't use RES2SV240 with SSDs. Since that's not the case, you're probably fine with the expander. I have the Intel in a 2U 24x 2.5" server and it works great for rotational media. There is a new LSI expander (the Intel uses the Bobcat LSI SAS expander I think) but wouldn't be much help. Get the Intel if you can a reasonable deal on it.

    Regards,
    Christopher Ryan
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