Hi, On 23/06/2015 06:06, Gregory Farnum wrote: > On Mon, Jun 22, 2015 at 10:34 PM, Loic Dachary <loic@xxxxxxxxxxx> wrote: >> Hi Tom, >> >> On 22/06/2015 17:10, Deneau, Tom wrote: >>> If one has a cluster with some nodes that can run with the ISA plugin >>> and some that cannot, is there a way to define a pool such that the >>> ISA-capable nodes can use the ISA plugin and the others can use say >>> the jerasure plugin? >> >> There is no way to do that, because there is no guarantee that an object encoded by jerasure can be decoded by isa and vice versa. > > Shouldn't we be able to set up something that *does* guarantee that, > though? Either by combining them into a single plugin which > dynamically configures to the fastest possible for that machine, or by > running them against the same object corpus and requiring that they > produce the same output? I don't know enough about the maths involved to evaluate how difficult it is. Although both implement Reed Solomon using Vandermonde or Cauchy matrices, I think there are details that makes the output different. Cheers > -Greg > -- Loïc Dachary, Artisan Logiciel Libre
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