On several more RAID specific SoC (like the PowerPC 440x/460x) a XOR
engine is included to speed up RAID calculations (effectively a hardware
RAID engine).
I think Intel Atom CPUs were planned/got a similar engine added, but
with the advance in CPU efficiencies and frequencies, these XOR engines
are practically obsolete: You will barely use 5% of your CPU (if a high
end CPU) for the parity calculation on RAID5.
These days it seems that the overhead from the parity calculations are
so small that they become insignificant.
On the other hand this is just based from my limited experience, maybe
there are some cases where we would benefit from that.
Regards,
Ben.
On 12/12/13 10:27, Pieter De Wit wrote:
Hi List,
Given the recent work done with techs like CUDA etc. - has the idea been
floated to use the video card for RAID parity calculations vs the CPU ?
Bitcoin and plenty others have shown the true speed of these cards. This
might be a cheaper version of a RAID card.
Cheers,
Pieter
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