Groups > linux.debian.user > #242082

Re: Where do I find the definitive man page for mdadm?

From	Gene Heskett <gheskett@shentel.net>
Newsgroups	linux.debian.user
Subject	Re: Where do I find the definitive man page for mdadm?
Date	2021-11-12 18:20 +0100
Message-ID	<DiInv-84S-7@gated-at.bofh.it> (permalink)
References	<DiEtz-5Mf-3@gated-at.bofh.it> <DiHUu-7FI-17@gated-at.bofh.it> <DiHUu-7FI-23@gated-at.bofh.it>
Organization	none,nada,zip

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On Friday 12 November 2021 11:49:29 The Wanderer wrote:

> On 2021-11-12 at 11:42, Gene Heskett wrote:
> > On Friday 12 November 2021 10:18:07 Dan Ritter wrote:
> >> Gene Heskett wrote:
> >> > Not in the stretch man page.  And its sounding as if I should do
> >> > that during the bullseye install to get the more capable mdadm,
> >> > but will the devices have the same names? With the reputation for
> >> > volatility of device names a mistake there could destroy 23 years
> >> > of data.
> >>
> >> After you have set them up, mdadm.conf has things like this:
> >>
> >> ARRAY /dev/md/0 metadata=1.2 name=debian:0
> >> UUID=aeac6271:676b1852:04f077d6:fcd285d6 ARRAY /dev/md/1
> >> metadata=1.2 name=debian:1 UUID=d74ff881:2e966c37:ec6ef1ec:75b8cdce
> >> ARRAY /dev/md/2 metadata=1.2 name=debian:2
> >> UUID=7c56166b:0d5aed8b:a9d03c45:e9b8080c
> >
> > That doesn't appear to be true. I have run the create which seemed
> > to be ok, then mkfs -text4 /dev/md0, then mounted it at /home2.
> >
> > But /etc/mdadm/mdadm.conf doesn't yet have any of that, only this:
>
> <snip>
>
> > Which from your descriptions is not complete. No ARRAY statements at
> > all. What did I do wrong?
>
> Not sure if you did anything wrong, but now that you've done the
> --create operation, you might try running
>
> # mdadm --detail --scan
>
> again. You might see that it now outputs definition lines like the
> ones Dan presented as examples; if so, you can append those lines to
> mdadm.conf, and if I'm not mistaken the result should (in theory) be
> valid.
>
> > And again, I don't trust UUID's as moving a drive cable to a
> > different socket has invalidated the whole lot of them once before.
>
> Eh? That doesn't make any sense at all. The UUID is supposed to be
> stored *on* the drive, so that it is independent of connection. I can
> testify that this has been the case in my experience with mdadm
> RAID-array UUIDs.

Does re-running blockid rewrite those?

I recall I did that when the moved cable didn't mount on reboot.

Cheers, Gene Heskett.
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/gene>

Thread

Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-12 14:10 +0100
  Re: Where do I find the definitive man page for mdadm? Dan Ritter <dsr@randomstring.org> - 2021-11-12 15:10 +0100
    Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-12 15:30 +0100
    Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-12 15:50 +0100
      Re: Where do I find the definitive man page for mdadm? Dan Ritter <dsr@randomstring.org> - 2021-11-12 16:40 +0100
        Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-12 17:50 +0100
          Re: Where do I find the definitive man page for mdadm? The Wanderer <wanderer@fastmail.fm> - 2021-11-12 17:50 +0100
            Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-12 18:20 +0100
          Re: Where do I find the definitive man page for mdadm? Andy Smith <andy@strugglers.net> - 2021-11-13 13:40 +0100
            Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-13 14:10 +0100
            Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-13 14:40 +0100
              Re: Where do I find the definitive man page for mdadm? Andy Smith <andy@strugglers.net> - 2021-11-13 15:00 +0100
                Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-13 15:30 +0100
                Re: Where do I find the definitive man page for mdadm? Andy Smith <andy@strugglers.net> - 2021-11-13 16:00 +0100
                Re: Where do I find the definitive man page for mdadm? David Wright <deblis@lionunicorn.co.uk> - 2021-11-13 17:40 +0100
                Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-13 19:20 +0100
                Re: Where do I find the definitive man page for mdadm? Andy Smith <andy@strugglers.net> - 2021-11-13 21:50 +0100
                Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-13 23:00 +0100
                Re: Where do I find the definitive man page for mdadm? Charles Curley <charlescurley@charlescurley.com> - 2021-11-14 00:10 +0100
                Re: Where do I find the definitive man page for mdadm? Greg Wooledge <greg@wooledge.org> - 2021-11-14 00:40 +0100
                Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-14 01:30 +0100
                Re: Where do I find the definitive man page for mdadm? Andy Smith <andy@strugglers.net> - 2021-11-14 09:10 +0100
                Re: Where do I find the definitive man page for mdadm? David Wright <deblis@lionunicorn.co.uk> - 2021-11-14 18:00 +0100
                Re: Where do I find the definitive man page for mdadm? "Thomas Schmitt" <scdbackup@gmx.net> - 2021-11-14 19:40 +0100
                Re: Where do I find the definitive man page for mdadm? David Wright <deblis@lionunicorn.co.uk> - 2021-11-15 02:40 +0100
                Re: Where do I find the definitive man page for mdadm? "Thomas Schmitt" <scdbackup@gmx.net> - 2021-11-15 09:10 +0100
                Re: Where do I find the definitive man page for mdadm? David Wright <deblis@lionunicorn.co.uk> - 2021-11-16 05:30 +0100
                Re: Where do I find the definitive man page for mdadm? Tom Dial <tddial@comcast.net> - 2021-11-14 05:00 +0100
                Re: Where do I find the definitive man page for mdadm? Greg Wooledge <greg@wooledge.org> - 2021-11-14 05:10 +0100
                Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-14 05:40 +0100
      Re: Where do I find the definitive man page for mdadm? Charles Curley <charlescurley@charlescurley.com> - 2021-11-12 18:10 +0100
        Re: Where do I find the definitive man page for mdadm? Charles Curley <charlescurley@charlescurley.com> - 2021-11-12 19:00 +0100
      Re: Where do I find the definitive man page for mdadm? "Andrew M.A. Cater" <amacater@einval.com> - 2021-11-12 18:10 +0100
        Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-12 20:10 +0100
          Re: Where do I find the definitive man page for mdadm? Dan Ritter <dsr@randomstring.org> - 2021-11-12 21:40 +0100
            Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-12 23:00 +0100
              Re: Where do I find the definitive man page for mdadm? The Wanderer <wanderer@fastmail.fm> - 2021-11-12 23:10 +0100
                Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-13 01:00 +0100
    Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-12 22:30 +0100
      Re: Where do I find the definitive man page for mdadm? Dan Ritter <dsr@randomstring.org> - 2021-11-13 12:30 +0100
        Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-13 13:30 +0100
          Re: Where do I find the definitive man page for mdadm? The Wanderer <wanderer@fastmail.fm> - 2021-11-13 13:50 +0100
            Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-13 15:00 +0100
          Re: Where do I find the definitive man page for mdadm? David Wright <deblis@lionunicorn.co.uk> - 2021-11-13 17:50 +0100
            Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-13 19:40 +0100
  Re: Where do I find the definitive man page for mdadm? Charles Curley <charlescurley@charlescurley.com> - 2021-11-12 15:10 +0100
    Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-12 15:30 +0100
      Re: Where do I find the definitive man page for mdadm? Andy Smith <andy@strugglers.net> - 2021-11-12 16:40 +0100
        Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-12 18:10 +0100
          Re: Where do I find the definitive man page for mdadm? Charles Curley <charlescurley@charlescurley.com> - 2021-11-12 19:20 +0100
            Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-12 20:20 +0100
              Re: Where do I find the definitive man page for mdadm? Charles Curley <charlescurley@charlescurley.com> - 2021-11-13 00:10 +0100
                Re: Where do I find the definitive man page for mdadm? Andy Smith <andy@strugglers.net> - 2021-11-13 12:40 +0100
        Re: Where do I find the definitive man page for mdadm? Dan Ritter <dsr@randomstring.org> - 2021-11-12 18:20 +0100
          Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-12 19:50 +0100
            Re: Where do I find the definitive man page for mdadm? Charles Curley <charlescurley@charlescurley.com> - 2021-11-12 23:50 +0100
              Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-13 01:10 +0100
          Re: Where do I find the definitive man page for mdadm? Andy Smith <andy@strugglers.net> - 2021-11-13 12:50 +0100
      Re: Where do I find the definitive man page for mdadm? Charles Curley <charlescurley@charlescurley.com> - 2021-11-12 17:50 +0100
        Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-12 18:10 +0100
          Re: Where do I find the definitive man page for mdadm? Charles Curley <charlescurley@charlescurley.com> - 2021-11-12 19:00 +0100
            Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-12 20:30 +0100
              Re: Where do I find the definitive man page for mdadm? Charles Curley <charlescurley@charlescurley.com> - 2021-11-13 00:20 +0100
  Re: Where do I find the definitive man page for mdadm? David Wright <deblis@lionunicorn.co.uk> - 2021-11-12 15:30 +0100
    Re: Where do I find the definitive man page for mdadm? Gene Heskett <gheskett@shentel.net> - 2021-11-12 16:10 +0100

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