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Am I reading this right?

K

Kelvarr

Supreme [H]ardness
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I am in the process of building a storage array, using a Supermicro 846 chassis. Now...I don't know if I ever really intend to fully fill this beast of a case, but it was free to me, so I'm utilizing it.

I did some quick napkin math, and wanted to see if I am interpreting my numbers right. I ran these numbers with a 30% overhead over theoretical.

Even if I ran all SAS3 drives, a PCIe 3.0 8x card has enough bandwidth (6200 MiB/s) to handle 25 SAS3 drives (240 MiB/s)...am I correct in that?
In other words, a 24i HBA in a single PCIe slot or a 4i HBA with a 28i Expander (occupying a totaly of 2 slots) would completely cover this 24 bay case.

1681931324620.png
 
In general, I think the thought is that you're fine with a single SAS3 HBA port covering a pretty large array of HDDs. It's only when you move to SSDs that you need to worry about total throughput.
 
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