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

From	Jochen Spieker <ml@well-adjusted.de>
Newsgroups	linux.debian.user
Subject	Re: Debian tool for creating drive images from mounted devices?
Date	2026-05-07 16:10 +0200
Message-ID	<MS7Am-3ith-7@gated-at.bofh.it> (permalink)
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Stefan Monnier:
>>> - You have the structural consistency of the file system itself
>>>   (directory structure, partial writes to files, superblock, etc).
>>>   LVM and other snapshotters help you with that.
>> I was always under the impression that an LVM snapshot is not better
>> than an unclean filesystem, like for example after a power loss. But
>> this 20 year old document proved me wrong:
>> 
>> https://tldp.org/HOWTO/LVM-HOWTO/snapshotintro.html
> 
> Indeed, but filesystems have worked hard (by carefully ordering writes
> and with the use of journaling) to make sure the "disk" is always in
> a consistent state in the case of a power loss.

Yes, but in this case the filesystem is still considered "unclean" and
needs a (quick) fsck before mounting it. 

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.

J.
-- 
If I could have anything in the world it would have to be more money.
[Agree]   [Disagree]
                 <http://archive.slowlydownward.com/NODATA/data_enter2.html>

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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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