On 07/17/2009 11:20 AM, H. Peter Anvin wrote:
Ric Wheeler wrote:
Worth sharing a pointer to a really neat set of papers that describe
open source friendly RAID6 and erasure encoding algorithms that were
presented last year and this at FAST:
http://www.cs.utk.edu/~plank/plank/papers/papers.html
If I remember correctly, James Plank's papers also have implemented
and benchmarked the various encodings,
I have seen the papers; I'm not sure it really makes that much
difference. One of the things that bugs me about these papers is that he
compares to *his* implementation of my optimizations, but not to my
code. In real life implementations, on commodity hardware, we're limited
by memory and disk performance, not by CPU utilization.
-hpa
Fair enough - I thought that his coverage of the other open source friendly
encodings beyond RAID6 was actually quite interesting.
If you have specifics that you found unconvincing in his work, I am pretty sure
that he would be delighted to hear from you first hand. James seemed to me to be
very reasonable and very much a pro-Linux academic, so I would love to be able
to get him and his grad students aligned in a useful way for us :-)
ric
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