Re: Debian tool for creating drive images from mounted devices?

From	Joe <joe@jretrading.com>
Newsgroups	linux.debian.user
Subject	Re: Debian tool for creating drive images from mounted devices?
Date	2026-05-07 20:00 +0200
Message-ID	<MSbaV-3kLO-5@gated-at.bofh.it> (permalink)
References	(3 earlier) <MS6Eh-3hQb-13@gated-at.bofh.it> <MS7qF-3i8G-5@gated-at.bofh.it> <MS7Am-3ith-7@gated-at.bofh.it> <MS9iN-3jwb-1@gated-at.bofh.it> <MSaeR-3k9Q-9@gated-at.bofh.it>
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On Thu, 7 May 2026 18:51:25 +0200
<tomas@tuxteam.de> wrote:

> On Thu, May 07, 2026 at 11:53:59AM -0400, Stefan Monnier wrote:
> 
> [...]
> 
> > > My point was that LVM actively asks mounted filesystems on LVs
> > > that are snapshotted to bring themselves to a consistent (clean)
> > > state before it does the snapshot. That was (20 year old) news to
> > > me.  
> 
> Is there any reference for that? AFAIK LVM doesn't "know" about the
> underlying file system (if there is any).
> 
>
My guess is it would run 'sync' once or twice before beginning a
snapshot, or maybe some more sophisticated equivalent. I think we'd know
by now if it didn't.

Applications intended for servers really ought to be designed to be
ready for disaster at any time, and try to minimise inconsistencies.
Any database being used for an important purpose should be using
atomic transactions as far as possible, for example.

-- 
Joe

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Debian tool for creating drive images from mounted devices? Hans <hans.ullrich@mail.de> - 2026-05-07 10:50 +0200
  Re: Debian tool for creating drive images from mounted devices? Geert Stappers <stappers@stappers.nl> - 2026-05-07 11:00 +0200
    Re: Debian tool for creating drive images from mounted devices? Hans <hans.ullrich@mail.de> - 2026-05-07 11:40 +0200
  Re: Debian tool for creating drive images from mounted devices? <tomas@tuxteam.de> - 2026-05-07 12:40 +0200
    Re: Debian tool for creating drive images from mounted devices? Tim Woodall <debianuser@woodall.me.uk> - 2026-05-10 12:50 +0200
  Re: Debian tool for creating drive images from mounted devices? Joe <joe@jretrading.com> - 2026-05-07 12:40 +0200
    Re: Debian tool for creating drive images from mounted devices? <tomas@tuxteam.de> - 2026-05-07 12:50 +0200
      Re: Debian tool for creating drive images from mounted devices? Jochen Spieker <ml@well-adjusted.de> - 2026-05-07 15:10 +0200
        Re: Debian tool for creating drive images from mounted devices? <tomas@tuxteam.de> - 2026-05-07 15:30 +0200
          Re: Debian tool for creating drive images from mounted devices? Jochen Spieker <ml@well-adjusted.de> - 2026-05-07 16:10 +0200
        Re: Debian tool for creating drive images from mounted devices? Stefan Monnier <monnier@iro.umontreal.ca> - 2026-05-07 16:00 +0200
          Re: Debian tool for creating drive images from mounted devices? Jochen Spieker <ml@well-adjusted.de> - 2026-05-07 16:10 +0200
            Re: Debian tool for creating drive images from mounted devices? Stefan Monnier <monnier@iro.umontreal.ca> - 2026-05-07 18:00 +0200
              Re: Debian tool for creating drive images from mounted devices? <tomas@tuxteam.de> - 2026-05-07 19:00 +0200
                Re: Debian tool for creating drive images from mounted devices? Joe <joe@jretrading.com> - 2026-05-07 20:00 +0200
                Re: Debian tool for creating drive images from mounted devices? <tomas@tuxteam.de> - 2026-05-07 20:20 +0200
                Re: Debian tool for creating drive images from mounted devices? <tomas@tuxteam.de> - 2026-05-10 14:50 +0200
                Re: Debian tool for creating drive images from mounted devices? Arno Lehmann <al@its-lehmann.de> - 2026-05-11 14:30 +0200
                Re: Debian tool for creating drive images from mounted devices? <tomas@tuxteam.de> - 2026-05-11 15:00 +0200
                Re: Debian tool for creating drive images from mounted devices? Stefan Monnier <monnier@iro.umontreal.ca> - 2026-05-11 17:50 +0200
                Re: Debian tool for creating drive images from mounted devices? Arno Lehmann <al@its-lehmann.de> - 2026-05-11 18:30 +0200
                Re: Debian tool for creating drive images from mounted devices? <tomas@tuxteam.de> - 2026-05-11 18:40 +0200
                Re: Debian tool for creating drive images from mounted devices? Stefan Monnier <monnier@iro.umontreal.ca> - 2026-05-11 22:00 +0200
                Re: Debian tool for creating drive images from mounted devices? <tomas@tuxteam.de> - 2026-05-11 18:30 +0200
                Re: Debian tool for creating drive images from mounted devices? Andy Smith <andy@strugglers.net> - 2026-05-11 19:50 +0200
                Re: Debian tool for creating drive images from mounted devices? Arno Lehmann <al@its-lehmann.de> - 2026-05-11 22:00 +0200
                Re: Debian tool for creating drive images from mounted devices? <tomas@tuxteam.de> - 2026-05-12 08:00 +0200
                Re: Debian tool for creating drive images from mounted devices? Andy Smith <andy@strugglers.net> - 2026-05-12 13:40 +0200
                Re: Debian tool for creating drive images from mounted devices? Stefan Monnier <monnier@iro.umontreal.ca> - 2026-05-07 21:10 +0200
  Re: Debian tool for creating drive images from mounted devices? Arno Lehmann <al@its-lehmann.de> - 2026-05-07 13:10 +0200
    Re: Debian tool for creating drive images from mounted devices? Hans <hans.ullrich@mail.de> - 2026-05-07 13:40 +0200
    Re: Debian tool for creating drive images from mounted devices? Hans <hans.ullrich@mail.de> - 2026-05-07 13:40 +0200
      Re: Debian tool for creating drive images from mounted devices? Charles Curley <charlescurley@charlescurley.com> - 2026-05-07 15:50 +0200
        Re: Debian tool for creating drive images from mounted devices? <tomas@tuxteam.de> - 2026-05-07 16:20 +0200
        Re: Debian tool for creating drive images from mounted devices? "Roy J. Tellason, Sr." <roy@rtellason.com> - 2026-05-07 20:30 +0200
      Re: Debian tool for creating drive images from mounted devices? Andy Smith <andy@strugglers.net> - 2026-05-07 18:30 +0200

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