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Performace of Single RAID card vs Striping Multiple Arrays (RAID 5)

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December 4, 2012 6:00:27 PM

I am currently working on creating a 48TB linux storage server that I eventually will make into an iSCSI target. What i'm stuck on right now is should I implement a single 24 port RAID card and create a single RAID 5 array to use for data storage OR should I implement 3 8-port RAID cards, create 3 RAID 5 arrays, and software RAID the 3 arrays together (RAID 0) so it shows up as one big disk (md0). Will I see any performance improvements by doing the second option? Will there be less parity calculation time since it is being spread across 3 arrays? ANY information is greatly appreciated.
December 4, 2012 6:03:19 PM

what kind of data would be stored and accessed on the arrays?
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a b G Storage
December 11, 2012 1:00:23 AM

Personally I would go with the single 24port RAID card, but this is also probably the more expensive of the two options. First off from a performance standpoint, with the single 24 port solution you can use the hardware RAID controller/proc for the XOR calcs rather than the system processor. From a reliability standpoint I tend to like hardware RAID better, and with 3 separate cards you have 3 potential things to fail versus 1. That being said, you should always have a spare controller and a spare 24 port would cost much more than a spare 8 port.
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a b G Storage
December 11, 2012 1:01:40 AM

BTW the added complexity of the 3card solution will make recovery in the event a failure exponentially more complicated.
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