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Re: write only storage.

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On 9/21/21 8:53 AM, Tim Woodall wrote:
> I would like to have some WORM memory for my backups. At the moment
> they're copied to an archive machine using a chrooted unprivileged user
> and then moved via a cron job so that that user cannot delete them
> (other than during a short window).
> 
> My though was to use a raspberry-pi4 to provide a USB mass storage
> device that is modified to not permit deleting. If the pi4 is not
> accessible via the network then other than bugs in the mass storage API
> it should be impossible to delete things without physical access to the
> pi.
> 
> Before I start reinventing the wheel, does anyone know of anything
> similar to this already in existence?
> 
> Things like chattr don't achieve what I want as root can still override
> that. I'm looking for something that requires physical access to delete.


Have you considered snapshots -- e.g. btrfs, LVM, or ZFS?


David

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Thread

write only storage. Tim Woodall <debianuser@woodall.me.uk> - 2021-09-21 18:10 +0200
  Re: write only storage. Toni Mas Soler <antomassol@protonmail.com> - 2021-09-21 18:30 +0200
    Re: write only storage. "Andrew M.A. Cater" <amacater@einval.com> - 2021-09-21 19:10 +0200
      Re: write only storage. Tim Woodall <debianuser@woodall.me.uk> - 2021-09-21 19:40 +0200
        Re: write only storage. "Thomas Schmitt" <scdbackup@gmx.net> - 2021-09-21 20:50 +0200
        Re: write only storage. Michael Stone <mstone@debian.org> - 2021-09-21 22:10 +0200
        Re: write only storage. Stefan Monnier <monnier@iro.umontreal.ca> - 2021-10-01 17:10 +0200
      Unclosed DVD-R or BD-R sessions ? was: Re: write only storage. "Thomas Schmitt" <scdbackup@gmx.net> - 2021-09-21 20:50 +0200
    Re: write only storage. Michael Stone <mstone@debian.org> - 2021-09-21 19:10 +0200
  Write *once* storage (was Re: write only storage) Steve McIntyre <steve@einval.com> - 2021-09-21 19:30 +0200
    Re: Write *once* storage (was Re: write only storage) "James H. H. Lampert" <jamesl@touchtonecorp.com> - 2021-09-21 19:40 +0200
    Re: Write *once* storage (was Re: write only storage) Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2021-09-22 01:30 +0200
  Re: write only storage. Marco Möller <talby@debianlists.mobilxpress.net> - 2021-09-21 19:30 +0200
    Re: write only storage. Tim Woodall <debianuser@woodall.me.uk> - 2021-09-21 19:50 +0200
    Re: write only storage. Linux-Fan <Ma_Sys.ma@web.de> - 2021-09-21 21:50 +0200
    Re: write only storage. Marco Möller <talby@debianlists.mobilxpress.net> - 2021-09-22 18:20 +0200
  Re: write only storage. David Christensen <dpchrist@holgerdanske.com> - 2021-09-22 06:20 +0200
    Re: write only storage. Tim Woodall <debianuser@woodall.me.uk> - 2021-09-22 10:10 +0200
      Re: write only storage. "Thomas Schmitt" <scdbackup@gmx.net> - 2021-09-22 12:30 +0200
        Re: write only storage. Tim Woodall <debianuser@woodall.me.uk> - 2021-09-22 16:40 +0200
      Re: write only storage. David Christensen <dpchrist@holgerdanske.com> - 2021-09-23 01:00 +0200

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