On Feb 1, 2012, at 4:09 AM, Jim Klimov wrote:

> 2012-02-01 6:22, Ragnar Sundblad wrote:
>> That is almost what I do, except that I only have one HBA.
>> We haven't seen many HBAs fail during the years, none actually, so we
>> thought it was overkill to double those too. But maybe we are wrong?
> Question: if you use two HBAs on different PCI buses to
> to MPxIO to the same JBODs, wouldn't this double your
> peak performance between motherboard and disks (beside
> adding resilience to failure of one of the paths)?

In general, for HDDs no, for SSDs yes.

> This might be less important with JBODs of HDDs, but
> more important with external arrays of SSD disks...
> or very many HDDs :)

With a fast SSD, you can easily get 700+ MB/sec when using mpxio, even
with a single HBA.
 -- richard

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