Date: Tue, 12 Aug 2014 15:32:34 -0500 From: Adam Vande More <amvandemore@gmail.com> To: Andrew Hamilton-Wright <AHamiltonWright@mta.ca> Cc: Roland Smith <rsmith@xs4all.nl>, FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: Problems with dump and restore Message-ID: <CA%2BtpaK3VQnjyO_8UNKZ1tKU3gCzJXHz5Kq_ix%2B4daby9MhzVOw@mail.gmail.com> In-Reply-To: <alpine.BSF.2.11.1408121708140.1074@qemg.org> References: <alpine.BSF.2.11.1408121255230.1074@qemg.org> <20140812193419.GB7166@slackbox.erewhon.home> <alpine.BSF.2.11.1408121641480.1074@qemg.org> <alpine.BSF.2.11.1408121708140.1074@qemg.org>
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On Tue, Aug 12, 2014 at 3:14 PM, Andrew Hamilton-Wright < AHamiltonWright@mta.ca> wrote: > > Sorry, a bit of a follow up after some reading, as the soft-update > bit was itching in my memory... > > > > On Tue, 12 Aug 2014, Roland Smith wrote: > > In 2011, a problem was found with snapshots in combination with soft >> updates *and* journaling (SU+J) hanging the machine. At that time the >> recommendation was to switch off journaling. >> According to https://wiki.freebsd.org/NewFAQs: >> >> If you want to use snapshot (dump -L) then disable the soft updates >> journal for that filesystem. >> > > I have just realize that the soft update journal (newfs option -j enable) > is actually not in play here, however "soft updates" (option -U) is. My > understanding of the referenced bug: > https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=160662 > is that it is specifically referred to _journaled_ soft updates as being > a danger, but soft updates using -U are not referred to by this bug. > > Is that your understanding as well? > > I believe that when I set up the filesystems for this machine in the first > place, I specifically ensured that "-j disable" was chosen, for exactly > this reason -- however my logbook does not contain enough detail for > me to be sure. > > > To be clear then, do I understand that your filesystem options include > neither "-j enable" nor "-U"? As stated in the bug, only SU+J needs disabling for live dumps. However, since the bug doesn't even apply to your situation, this is a red herring. -- Adam
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