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Re: RAID1 + iSCSI as backup (was Re: More RAID weirdness: external RAID over network)

From Dan Ritter <dsr@randomstring.org>
Newsgroups linux.debian.user
Subject Re: RAID1 + iSCSI as backup (was Re: More RAID weirdness: external RAID over network)
Date 2023-03-17 22:10 +0100
Message-ID <GapuO-dbK3-7@gated-at.bofh.it> (permalink)
References (2 earlier) <GahQE-d6Es-3@gated-at.bofh.it> <Gajpn-d7JR-3@gated-at.bofh.it> <Gajz3-d7NH-11@gated-at.bofh.it> <Gak25-d8fW-3@gated-at.bofh.it> <Gaop3-daS3-3@gated-at.bofh.it>
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Gregory Seidman wrote: 
> On Fri, Mar 17, 2023 at 06:00:46PM +0300, Reco wrote:
> [...]
> > PS There's that old saying, "RAID is not a substitute for a backup".
> > What you're trying to do sounds suspiciously similar to an old "RAID
> > split-mirror" backup technique. Just saying.

...


> It sounds to me like adding an iSCSI volume (e.g. from AWS) to the RAID as
> an additional mirror would be a way to produce the off-site backup I want
> (and LUKS means I am not concerned about encryption in transit). It also
> sounds like you're saying this is not a good backup approach. Ignoring
> cost, what am I missing?


Three different things:

resiliency in the face of storage failure: RAID.

restoration of files that were recently deleted: snapshots.

complete restoration of a filesystem: backup.

(and technically, a fourth: complete restoration of points in
time: archives).

You can combine the approaches, but they can only be substituted
in particular directions. A RAID alone doesn't give you
protection against deleted files (or deleted filesystems), which
is what a backup is for.

-dsr-

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Thread

More RAID weirdness: external RAID over network Nicolas George <george@nsup.org> - 2023-03-17 11:10 +0100
  Re: More RAID weirdness: external RAID over network Reco <recoverym4n@enotuniq.net> - 2023-03-17 12:00 +0100
    Re: More RAID weirdness: external RAID over network Nicolas George <george@nsup.org> - 2023-03-17 14:00 +0100
      Re: More RAID weirdness: external RAID over network Reco <recoverym4n@enotuniq.net> - 2023-03-17 15:40 +0100
        Re: More RAID weirdness: external RAID over network Nicolas George <george@nsup.org> - 2023-03-17 15:50 +0100
          Re: More RAID weirdness: external RAID over network Reco <recoverym4n@enotuniq.net> - 2023-03-17 16:20 +0100
            Re: More RAID weirdness: external RAID over network Nicolas George <george@nsup.org> - 2023-03-17 16:30 +0100
              Re: More RAID weirdness: external RAID over network Dan Ritter <dsr@randomstring.org> - 2023-03-17 17:10 +0100
                Re: More RAID weirdness: external RAID over network Nicolas George <george@nsup.org> - 2023-03-17 17:10 +0100
                Re: More RAID weirdness: external RAID over network Tim Woodall <debianuser@woodall.me.uk> - 2023-03-17 18:00 +0100
                Re: More RAID weirdness: external RAID over network Greg Wooledge <greg@wooledge.org> - 2023-03-17 20:10 +0100
                Re: More RAID weirdness: external RAID over network Nicolas George <george@nsup.org> - 2023-03-17 21:50 +0100
                Re: More RAID weirdness: external RAID over network Nicolas George <george@nsup.org> - 2023-03-17 22:00 +0100
                Re: More RAID weirdness: external RAID over network Tim Woodall <debianuser@woodall.me.uk> - 2023-03-17 23:50 +0100
                Re: More RAID weirdness: external RAID over network Nicolas George <george@nsup.org> - 2023-03-20 11:50 +0100
            RAID1 + iSCSI as backup (was Re: More RAID weirdness: external RAID  over network) Gregory Seidman <gsslist+debian@anthropohedron.net> - 2023-03-17 21:00 +0100
              Re: RAID1 + iSCSI as backup (was Re: More RAID weirdness: external  RAID over network) Dan Ritter <dsr@randomstring.org> - 2023-03-17 22:10 +0100
              Re: RAID1 + iSCSI as backup (was Re: More RAID weirdness: external  RAID over network) David Christensen <dpchrist@holgerdanske.com> - 2023-03-18 02:10 +0100
                Re: RAID1 + iSCSI as backup (was Re: More RAID weirdness: external  RAID over network) Gregory Seidman <gsslist+debian@anthropohedron.net> - 2023-03-18 03:30 +0100
                Re: RAID1 + iSCSI as backup (was Re: More RAID weirdness: external  RAID over network) David Christensen <dpchrist@holgerdanske.com> - 2023-03-18 09:10 +0100
                Re: RAID1 + iSCSI as backup (was Re: More RAID weirdness: external  RAID over network) Dan Ritter <dsr@randomstring.org> - 2023-03-19 02:40 +0100

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