Date: Tue, 17 May 2016 12:06:41 -0500 (CDT) From: Bob Friesenhahn <bfriesen@simple.dallas.tx.us> To: Ben RUBSON <ben.rubson@gmail.com> Cc: freebsd-fs@freebsd.org Subject: Re: Best practice for high availability ZFS pool Message-ID: <alpine.GSO.2.20.1605171201040.14628@freddy.simplesystems.org> In-Reply-To: <40C35566-B7FB-4F59-BB41-D43BC0362C26@gmail.com> References: <5E69742D-D2E0-437F-B4A9-A71508C370F9@FreeBSD.org> <alpine.GSO.2.20.1605162034170.7756@freddy.simplesystems.org> <AB71607F-7048-404E-AFE3-D448823BB768@gmail.com> <alpine.GSO.2.20.1605170819220.7756@freddy.simplesystems.org> <40C35566-B7FB-4F59-BB41-D43BC0362C26@gmail.com>
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On Tue, 17 May 2016, Ben RUBSON wrote: >> On 17 may 2016 at 15:24, Bob Friesenhahn <bfriesen@simple.dallas.tx.us> wrote: >> >> There is at least one case of zfs send propagating a problem into the receiving pool. I don't know if it broke the pool. Corrupt data may be sent from one pool to another if it passes checksums. > > Do you have any link to this problem ? Would be interesting to know if it was possible to come-back to a previous snapshot / consistent pool. I don't have a link but I recall that it had something to do with the ability to send file 'holes' in the stream. > I think that making ZFS send/receive has a higher security level than mirroring to a second (or third) JBOD box. > With mirroring you will still have only one ZFS pool. This is a reasonable assumption. > However, if send/receive makes the receiving pool the exact 1:1 copy > of the sending pool, then the thing which made the sending pool to > corrupt could reach (and corrupt) the receiving pool... I don't know > whether or not this could occur, and if ever it occurs, if we have > the chance to revert to a previous snapshot, at least on the > receiving side... Zfs receive does not result in a 1:1 copy. The underlying data organization can be completely different and compression or other options can be changed. Bob -- Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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