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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://gpfsug.org/pipermail/gpfsug-discuss_gpfsug.org/attachments/20160316/eb7c6980/attachment.html>