Version 5 Development > Roadmap
Mirror user share?
osli:
Cool... thanks guys. Still learning linux in general, so it would have taken me quite a while to stumble onto the proper way to create this solution on my own. :)
Curious about one comment...
--- Quote from: Helmonder on April 04, 2012, 10:10:47 AM ---It does not fill the same need as the double parity though; if the two drives fail that you keep the original and copy-share on you are still out of data.. But ofcourse it does reduce the likelyhood of this happening...
--- End quote ---
Ah. This is because unRaid can't currently protect against a two drive failure, of any combination? So if you lose two data drives, you still have readable files on all the other data drives but there is no way to rebuild from parity, right? I guess if the two drives you lost were one of the data and the parity, you'd be good, so this is a little better protected than just one copy.... increases the odds as Helmonder said.
Didn't think about that. I suppose the quick solution is to just add an additional level of share, i.e. "original", "copy", and "copy without deletions" or some sort so that there are three physical discs (or however many you want depending on paranoia level) with copies. A bit of a waste of space but again since these aren't typically big files I would be OK with that. The more elegant solution would be for any designated share to be duplicated by unRaid to have a dedicated space in parity that is essentially the third copy, separated from the other parity data. In that case, anything in this "protected" space would be recoverable only from parity as it would essentially be a duplicate copy as well, not true parity data of the "x" number of other copies on the data drives. I'm sure that would take quite a bit of fiddling with the core of unRaid, and I assume it isn't something likely to be on the roadmap (ever, I'm sure :) ), so I'll be good with the pointers already provided here to work out my own best solution for my needs.
Thanks again.
Helmonder:
And thank you ! I actually learned something fiddling with your idea and am using it actively right now... !
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