IBM ESS, GSS, GNR, and Perseus refer to the same "declustered" IBM raid-in-software technology with advanced striping and error recovery.
I just googled some of those terms and hit this not written by IBM summary: http://www.raidinc.com/file-storage/gss-ess Also, this is now a "mature" technology. IBM has been doing this since before 2008. See pages 9 and 10 of: http://storageconference.us/2008/presentations/2.Tuesday/6.Haskin.pdf
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