Date: Thu, 9 Oct 2008 16:21:14 +0200 (CEST) From: Oliver Fromme <olli@lurza.secnetix.de> To: freebsd-hackers@FreeBSD.ORG, zbeeble@gmail.com Subject: Re: continuous backup solution for FreeBSD Message-ID: <200810091421.m99ELEcm007901@lurza.secnetix.de> In-Reply-To: <5f67a8c40810081019w79e0bb42i49c4da623b6e08ab@mail.gmail.com>
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Zaphod Beeblebrox wrote: > Oliver Fromme wrote: > > However, ZFS does exist on FreeBSD, and I think it wouldn't > > be impossible to add similar features to ZFS. > > Possibly even as a ZFS module? This might be something better addressed at > the ZFS project level --- but the next question is: does FreeBSD support ZFS > modules? I'm sorry I don't know. But also see my other reply regarding ZFS snapshots ans "zfs send". > > Another possibility would be to extend gjournal by adding > > time stamps to journal transactions and a possibility to > > feed the journal to a pipe, socket or whatever. And of > > course a client-side implementation that does something > > useful with the journal stream. This might even be a good > > SoC project. > > Now this interests me. Firstly, I thought that gjournal might only be > responsible for the meta-data (but I'm happy to be wrong on this point). Nope, gjournal handles _all_ data, i.e. meta data and file contents. > Secondly, is it a) sufficient and b) efficient to attempt to time-travel UFS > with the gjournal log? I almost don't dare to mention DragonFly BSD again, but they do have a UFS journaling implementation that does exactly that: http://leaf.dragonflybsd.org/cgi/web-man?command=mountctl http://leaf.dragonflybsd.org/cgi/web-man?command=jscan However, I think the implementation was abandoned because it was obsoleted by the development of the HAMMER file system. But the basic functionality is there and works. Best regards Oliver -- Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing b. M. Handelsregister: Registergericht Muenchen, HRA 74606, Geschäftsfuehrung: secnetix Verwaltungsgesellsch. mbH, Handelsregister: Registergericht Mün- chen, HRB 125758, Geschäftsführer: Maik Bachmann, Olaf Erb, Ralf Gebhart FreeBSD-Dienstleistungen, -Produkte und mehr: http://www.secnetix.de/bsd "IRIX is about as stable as a one-legged drunk with hypothermia in a four-hundred mile per hour wind, balancing on a banana peel on a greased cookie sheet -- when someone throws him an elephant with bad breath and a worse temper." -- Ralf Hildebrandt
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