Date: Fri, 31 Oct 2014 08:10:22 -0700 From: "Chris H" <bsd-lists@bsdforge.com> To: Kevin Oberman <rkoberman@gmail.com>, Adrian Chadd <adrian@freebsd.org> Cc: freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: Dump time issues Message-ID: <9c5f3b0230bf63d32ee8a83e81b1f167@ultimatedns.net> In-Reply-To: <CAJ-Vmo=ahsmVPAmidB33NTtKmxv0QDvp%2BU4Mua3=z1bjQ4dC0w@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>, <CAJ-Vmo=ahsmVPAmidB33NTtKmxv0QDvp%2BU4Mua3=z1bjQ4dC0w@mail.gmail.com>
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On Tue, 28 Oct 2014 12:20:01 -0700 Adrian Chadd <adrian@freebsd.org> wrote > 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. Problem existed on RELENG_9 as of 1 mos, and 1 wk. ago. I don't have any useful output to provide (I simply blew away the system && re-installed w/o SU+J). --Chris > > > > > -adrian
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