Re: Converted EXT4 is Slow to Check

From	Borax Man <boraxman@geidiprime.invalid>
Newsgroups	comp.os.linux.misc
Subject	Re: Converted EXT4 is Slow to Check
Date	2026-05-09 14:06 +0000
Organization	A noiseless patient Spider
Message-ID	<slrn10vufrl.gce.boraxman@geidiprime.invalid> (permalink)
References	(10 earlier) <gjmdnU6EHePm6mT0nZ2dnZfqn_WdnZ2d@giganews.com> <slrn10vp423.92m.boraxman@geidiprime.invalid> <10tja2s$2gr2q$3@dont-email.me> <slrn10vrmaj.cs1.boraxman@geidiprime.invalid> <10tljba$36s18$4@dont-email.me>

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On 2026-05-08, Lawrence D’Oliveiro <ldo@nz.invalid> wrote:
> On Fri, 8 May 2026 12:38:44 -0000 (UTC), Borax Man wrote:
>
>> If you want a robust system which can repair without a backup, you
>> can always use parchive, which can store parity data allowing you to
>> check AND repair up to a certain amount of damage.
>
> parchive is the sort of thing I’m thinking of. Because it doesn’t
> matter how many redundant copies of a file you have, if an error
> happens in the same block on all of them, you’re stuffed. Using the
> PAR2 format (erasure code) gets around this.
>
>> However it doesn't work as well for large directory trees, and if
>> you do decide to 'parchive' a whole folder, and you need to delete
>> or update a file, you have to compute it all again.
>
> Surely you don’t update your backup snapshots in-place, you create new
> ones. Once a backup snapshot is made, you shouldn’t go around fiddling
> with it. Either keep it or, if it’s been obsoleted by a newer one,
> throw it away.

I use DAR for backups, and it has an option to run parchive over the
backup file.  Backups are incremental.

I use parchive also for my home photo collection.  One I fill a folder,
I run parchive and make it all read-only.

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Thread

Converted EXT4 is Slow to Check Leroy H <lh@somewhere.net> - 2026-04-24 00:04 +0000
  Re: Converted EXT4 is Slow to Check Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-24 02:29 +0000
    Re: Converted EXT4 is Slow to Check Leroy H <lh@somewhere.net> - 2026-04-24 09:23 +0000
      Re: Converted EXT4 is Slow to Check The Natural Philosopher <tnp@invalid.invalid> - 2026-04-24 10:28 +0100
      Re: Converted EXT4 is Slow to Check c186282 <c186282@nnada.net> - 2026-04-24 19:46 -0400
  Re: Converted EXT4 is Slow to Check "Carlos E.R." <robin_listas@es.invalid> - 2026-04-24 10:55 +0200
  Re: Converted EXT4 is Slow to Check Borax Man <boraxman@geidiprime.invalid> - 2026-04-26 12:53 +0000
    Re: Converted EXT4 is Slow to Check Leroy H <lh@somewhere.net> - 2026-04-26 14:01 +0000
      Re: Converted EXT4 is Slow to Check "Carlos E.R." <robin_listas@es.invalid> - 2026-04-26 20:54 +0200
      Re: Converted EXT4 is Slow to Check Borax Man <boraxman@geidiprime.invalid> - 2026-04-27 13:25 +0000
  Re: Converted EXT4 is Slow to Check Rich <rich@example.invalid> - 2026-04-27 15:24 +0000
    Re: Converted EXT4 is Slow to Check Borax Man <boraxman@geidiprime.invalid> - 2026-04-29 13:10 +0000
      Re: Converted EXT4 is Slow to Check Rich <rich@example.invalid> - 2026-04-29 15:57 +0000
        Re: Converted EXT4 is Slow to Check c186282 <c186282@nnada.net> - 2026-04-30 01:02 -0400
          Re: Converted EXT4 is Slow to Check "Carlos E.R." <robin_listas@es.invalid> - 2026-04-30 11:01 +0200
          Re: Converted EXT4 is Slow to Check Borax Man <rotflol2@hotmail.com> - 2026-04-30 12:36 +0000
            Re: Converted EXT4 is Slow to Check gazelle@shell.xmission.com (Kenny McCormack) - 2026-04-30 14:32 +0000
              Re: Converted EXT4 is Slow to Check Nuno Silva <nunojsilva@invalid.invalid> - 2026-04-30 16:42 +0100
                Re: Converted EXT4 is Slow to Check Borax Man <boraxman@geidiprime.invalid> - 2026-05-03 12:29 +0000
                Re: Converted EXT4 is Slow to Check "Carlos E.R." <robin_listas@es.invalid> - 2026-05-03 21:13 +0200
                Re: Converted EXT4 is Slow to Check Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-05-03 22:05 +0000
                Re: Converted EXT4 is Slow to Check jayjwa <jayjwa@atr2.ath.cx.invalid> - 2026-05-04 12:08 -0400
                Re: Converted EXT4 is Slow to Check John Bokma <contact@johnbokma.com> - 2026-05-04 19:24 +0200
                Re: Converted EXT4 is Slow to Check Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-05-05 00:00 +0000
                Re: Converted EXT4 is Slow to Check Borax Man <boraxman@geidiprime.invalid> - 2026-05-04 12:41 +0000
                Re: Converted EXT4 is Slow to Check "Carlos E.R." <robin_listas@es.invalid> - 2026-05-04 20:04 +0200
                Re: Converted EXT4 is Slow to Check Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-05-05 00:05 +0000
                Re: Converted EXT4 is Slow to Check "Carlos E.R." <robin_listas@es.invalid> - 2026-05-05 12:07 +0200
                Re: Converted EXT4 is Slow to Check Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-05-05 21:56 +0000
                Re: Converted EXT4 is Slow to Check "Carlos E.R." <robin_listas@es.invalid> - 2026-05-06 02:41 +0200
                Re: Converted EXT4 is Slow to Check Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-05-06 04:13 +0000
                Re: Converted EXT4 is Slow to Check Nuno Silva <nunojsilva@invalid.invalid> - 2026-05-06 13:03 +0100
                Re: Converted EXT4 is Slow to Check Richard Kettlewell <invalid@invalid.invalid> - 2026-05-06 10:21 +0100
                Re: Converted EXT4 is Slow to Check "Carlos E.R." <robin_listas@es.invalid> - 2026-05-06 13:36 +0200
                Re: Converted EXT4 is Slow to Check Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-05-06 21:16 +0000
                Re: Converted EXT4 is Slow to Check Nuno Silva <nunojsilva@invalid.invalid> - 2026-05-06 23:31 +0100
                Re: Converted EXT4 is Slow to Check Marc Haber <mh+usenetspam2616@zugschl.us> - 2026-05-07 06:41 +0200
                Re: Converted EXT4 is Slow to Check Nuno Silva <nunojsilva@invalid.invalid> - 2026-05-07 08:34 +0100
                Re: Converted EXT4 is Slow to Check Richard Kettlewell <invalid@invalid.invalid> - 2026-05-07 09:06 +0100
                Re: Converted EXT4 is Slow to Check "Carlos E.R." <robin_listas@es.invalid> - 2026-05-07 10:58 +0200
                Re: Converted EXT4 is Slow to Check not@telling.you.invalid (Computer Nerd Kev) - 2026-05-08 09:00 +1000
                Re: Converted EXT4 is Slow to Check Nuno Silva <nunojsilva@invalid.invalid> - 2026-05-08 09:45 +0100
                Re: Converted EXT4 is Slow to Check not@telling.you.invalid (Computer Nerd Kev) - 2026-05-09 10:01 +1000
                Re: Converted EXT4 is Slow to Check Leroy H <lh@somewhere.net> - 2026-05-09 00:12 +0000
                Re: Converted EXT4 is Slow to Check Computer Nerd Kev <not@telling.you.invalid> - 2026-05-09 17:30 +1000
                Re: Converted EXT4 is Slow to Check Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-05-08 00:12 +0000
                Re: Converted EXT4 is Slow to Check "Carlos E.R." <robin_listas@es.invalid> - 2026-05-08 10:57 +0200
                Re: Converted EXT4 is Slow to Check Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-05-08 09:26 +0000
                Re: Converted EXT4 is Slow to Check "Carlos E.R." <robin_listas@es.invalid> - 2026-05-08 12:47 +0200
                Re: Converted EXT4 is Slow to Check Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-05-08 21:55 +0000
                Re: Converted EXT4 is Slow to Check Nuno Silva <nunojsilva@invalid.invalid> - 2026-05-08 16:42 +0100
                Re: Converted EXT4 is Slow to Check Richard Kettlewell <invalid@invalid.invalid> - 2026-05-08 22:42 +0100
                Re: Converted EXT4 is Slow to Check Nuno Silva <nunojsilva@invalid.invalid> - 2026-05-09 08:34 +0100
                Re: Converted EXT4 is Slow to Check Richard Kettlewell <invalid@invalid.invalid> - 2026-05-09 10:18 +0100
                Re: Converted EXT4 is Slow to Check "Carlos E.R." <robin_listas@es.invalid> - 2026-05-09 13:31 +0200
                Re: Converted EXT4 is Slow to Check Marc Haber <mh+usenetspam2616@zugschl.us> - 2026-05-09 09:57 +0200
                Re: Converted EXT4 is Slow to Check c186282 <c186282@nnada.net> - 2026-05-06 00:53 -0400
                Re: Converted EXT4 is Slow to Check "Carlos E.R." <robin_listas@es.invalid> - 2026-05-06 10:47 +0200
                Re: Converted EXT4 is Slow to Check Borax Man <boraxman@geidiprime.invalid> - 2026-05-07 13:17 +0000
                Re: Converted EXT4 is Slow to Check rbowman <bowman@montana.com> - 2026-05-05 01:22 +0000
                Re: Converted EXT4 is Slow to Check c186282 <c186282@nnada.net> - 2026-05-05 00:52 -0400
                Re: Converted EXT4 is Slow to Check "Carlos E.R." <robin_listas@es.invalid> - 2026-05-05 12:11 +0200
                Re: Converted EXT4 is Slow to Check c186282 <c186282@nnada.net> - 2026-05-06 00:46 -0400
                Re: Converted EXT4 is Slow to Check rbowman <bowman@montana.com> - 2026-05-06 06:43 +0000
                Re: Converted EXT4 is Slow to Check c186282 <c186282@nnada.net> - 2026-05-06 11:05 -0400
                Re: Converted EXT4 is Slow to Check rbowman <bowman@montana.com> - 2026-05-06 19:47 +0000
                Re: Converted EXT4 is Slow to Check Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2026-05-06 15:10 -0700
                Re: Converted EXT4 is Slow to Check c186282 <c186282@nnada.net> - 2026-05-06 22:04 -0400
                Re: Converted EXT4 is Slow to Check rbowman <bowman@montana.com> - 2026-05-07 06:32 +0000
                Re: Converted EXT4 is Slow to Check c186282 <c186282@nnada.net> - 2026-05-07 17:37 -0400
                Re: Converted EXT4 is Slow to Check rbowman <bowman@montana.com> - 2026-05-08 00:30 +0000
                Re: Converted EXT4 is Slow to Check c186282 <c186282@nnada.net> - 2026-05-07 23:20 -0400
                Re: Converted EXT4 is Slow to Check "Carlos E.R." <robin_listas@es.invalid> - 2026-05-06 10:51 +0200
                Re: Converted EXT4 is Slow to Check The Natural Philosopher <tnp@invalid.invalid> - 2026-05-06 17:38 +0100
                Re: Converted EXT4 is Slow to Check "Carlos E.R." <robin_listas@es.invalid> - 2026-05-06 20:52 +0200
                Re: Converted EXT4 is Slow to Check Borax Man <boraxman@geidiprime.invalid> - 2026-05-07 13:14 +0000
                Re: Converted EXT4 is Slow to Check The Natural Philosopher <tnp@invalid.invalid> - 2026-05-07 16:51 +0100
                Re: Converted EXT4 is Slow to Check Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-05-07 18:35 +0000
                Re: Converted EXT4 is Slow to Check The Natural Philosopher <tnp@invalid.invalid> - 2026-05-07 20:08 +0100
                Re: Converted EXT4 is Slow to Check Borax Man <boraxman@geidiprime.invalid> - 2026-05-08 12:47 +0000
                Re: Converted EXT4 is Slow to Check The Natural Philosopher <tnp@invalid.invalid> - 2026-05-08 14:22 +0100
                Re: Converted EXT4 is Slow to Check Rich <rich@example.invalid> - 2026-05-08 13:24 +0000
                Re: Converted EXT4 is Slow to Check Borax Man <boraxman@geidiprime.invalid> - 2026-05-09 14:08 +0000
                Re: Converted EXT4 is Slow to Check "Carlos E.R." <robin_listas@es.invalid> - 2026-05-07 20:20 +0200
                Re: Converted EXT4 is Slow to Check Borax Man <boraxman@geidiprime.invalid> - 2026-05-08 12:40 +0000
                Re: Converted EXT4 is Slow to Check Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-05-08 00:17 +0000
                Re: Converted EXT4 is Slow to Check Borax Man <boraxman@geidiprime.invalid> - 2026-05-08 12:38 +0000
                Re: Converted EXT4 is Slow to Check Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-05-08 21:07 +0000
                Re: Converted EXT4 is Slow to Check Borax Man <boraxman@geidiprime.invalid> - 2026-05-09 14:06 +0000
                Re: Converted EXT4 is Slow to Check Rich <rich@example.invalid> - 2026-05-09 15:27 +0000
                Re: Converted EXT4 is Slow to Check Borax Man <boraxman@geidiprime.invalid> - 2026-05-10 12:28 +0000
                Re: Converted EXT4 is Slow to Check "Carlos E.R." <robin_listas@es.invalid> - 2026-05-05 12:08 +0200
              Re: Converted EXT4 is Slow to Check The Natural Philosopher <tnp@invalid.invalid> - 2026-04-30 17:05 +0100
                Re: Converted EXT4 is Slow to Check c186282 <c186282@nnada.net> - 2026-04-30 14:28 -0400
              Re: Converted EXT4 is Slow to Check Borax Man <boraxman@geidiprime.invalid> - 2026-05-03 12:15 +0000
            Re: Converted EXT4 is Slow to Check The Natural Philosopher <tnp@invalid.invalid> - 2026-04-30 16:54 +0100
            Re: Converted EXT4 is Slow to Check Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-05-01 00:15 +0000
              Re: Converted EXT4 is Slow to Check c186282 <c186282@nnada.net> - 2026-04-30 20:36 -0400
                Re: Converted EXT4 is Slow to Check Borax Man <boraxman@geidiprime.invalid> - 2026-05-03 12:08 +0000
      Re: Converted EXT4 is Slow to Check c186282 <c186282@nnada.net> - 2026-04-30 00:59 -0400

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