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 -- ZFS Performance and Training richard.ell...@richardelling.com +1-760-896-4422
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