Ok, the salt is explained elsewhere in the presentation, so now I know it is not changed often.
On Tue, Oct 11, 2016 at 04:11:07AM +0200, Pawel Jakub Dawidek wrote: > Hi Thomas, > > I'm going through your OpenZFS presentation and I'd like to get more > info about IV storage. > > In the presentation you mention that you cannot generate IV, that it has > to be stored somewhere. Generating it from 'DVA[0] + birth txg + salt' > does sound like a good idea, but you mentioned that birth txg can rewind > on import. It can, but we still generate new salt every time we store > the block (don't we?) and birth txg could be fixed by simply starting > from some sane value on import, eg. 'on-disk-birth-txg + 1024'. > Consecutive crashes on import might be a problem, though. > In the presentation you address why DVA[0] and birth txg don't give us > uniqueness, but you don't talk about the salt, which is the most > promissing bit. Could you elaborate? > > There is also IV (96 bits) on the slide, but I think I saw you mention > somewhere else (on github?) it is now 128 bits, right? If I wrong, could > you please talk about 96 bits IV too? > > Thanks! > > -- > Pawel Jakub Dawidek http://www.wheelsystems.com > FreeBSD committer http://www.FreeBSD.org > Am I Evil? Yes, I Am! http://mobter.com -- Pawel Jakub Dawidek http://www.wheelsystems.com FreeBSD committer http://www.FreeBSD.org Am I Evil? Yes, I Am! http://mobter.com
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