Date: Tue, 28 Oct 2014 12:20:01 -0700 From: Adrian Chadd <adrian@freebsd.org> To: Kevin Oberman <rkoberman@gmail.com> Cc: freebsd-stable <freebsd-stable@freebsd.org>, Chris H <bsd-lists@bsdforge.com> Subject: Re: Dump time issues Message-ID: <CAJ-Vmo=ahsmVPAmidB33NTtKmxv0QDvp%2BU4Mua3=z1bjQ4dC0w@mail.gmail.com> In-Reply-To: <CAN6yY1sOothUj1i5tTKPHDYNZ%2BCQ3ZKxmYrmq_GE4Ft66LPcBw@mail.gmail.com> References: <6978A7BF-3CB7-4088-904D-5A60D755A04C@gmail.com> <20141025113846.GY1235@albert.catwhisker.org> <CAN6yY1tp%2Box6jHVnFJ4m3AYf4bBY-OzEfTnwrBHZZ0wwEARAxg@mail.gmail.com> <6bb4cda435fb420fb663fa1d47b85a08@ultimatedns.net> <CAN6yY1sOothUj1i5tTKPHDYNZ%2BCQ3ZKxmYrmq_GE4Ft66LPcBw@mail.gmail.com>
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On 27 October 2014 11:09, Kevin Oberman <rkoberman@gmail.com> wrote: >> I'm aware of two issues with SU+J, one of which is annoying and the other > is worse. > 1. If the journal is not fully written on power fail or some other reason, > you may need to do a full fsck of the volume and the behavior of the system > until this is done can be very unpredictable. > 2. You can't safely snapshot the system. This is what 'dump -L' does. This > means that some files dumped from a live FS may not be consistent (not > good!) or, if '-L' is used, the system may well hang. > > While I love the fast fsck times (2 or 3 seconds) after a crash, I also > question the default. Still, it may be a preferred choice be used for very > large file systems where a full fsck would take a very long time as long as > the risks are understood. For these systems, ZFS might be a better choice. > These arguments do NOT favor it being the default, IMHO. If people can reproduce SU+J problems then please file bugs. There have been some fixes with the journal handling over the last year or so and I haven't had this problem on -HEAD any longer, but it doesn't mean it's there. -adrian
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