Re: mdadm - two questions

From	Jens Sauer <jsauer65@gmail.com>
Newsgroups	linux.debian.user
Subject	Re: mdadm - two questions
Date	2016-11-22 22:10 +0100
Message-ID	<sGque-45L-21@gated-at.bofh.it> (permalink)
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> Unfortunately I cannot see how from raid1 of 2*1TB disks migrate to
> raid1(raid10?)  of 4*1TB disks

I don't think you can reshape a RAID 1 to a RAID 10.

mdadm can reshape RAID 1/5/6. You can move from RAID 5 to 6 or the other
way around.
*Maybe* you can even reshape from 1 to RAID 5/6.

I see these options:

* create a second RAID 1 with the new devices, make this a pv and add it to
your vg
* backup all data, create a RAID 10/5/6 with all four devices
* Test if you can reshape from RAID 1 to 5/6

The last option only if RAID 5/6 serves your needs.

Regards,
Jens

Thread

mdadm - two questions   kjonca@poczta.onet.pl (Kamil Jońca) - 2016-11-22 18:40 +0100
  Re: mdadm - two questions Dan Ritter <dsr@randomstring.org> - 2016-11-22 19:10 +0100
    Re: mdadm - two questions kjonca@poczta.onet.pl (Kamil Jońca) - 2016-11-22 21:40 +0100
      Re: mdadm - two questions Dan Ritter <dsr@randomstring.org> - 2016-11-22 22:00 +0100
        Re: mdadm - two questions kjonca@poczta.onet.pl (Kamil Jońca) - 2016-11-23 06:40 +0100
      Re: mdadm - two questions Jens Sauer <jsauer65@gmail.com> - 2016-11-22 22:10 +0100
  Re: mdadm - two questions Frédéric Marchal <frederic.marchal@wowtechnology.com> - 2016-11-23 14:10 +0100
  Re: mdadm - two questions kjonca@poczta.onet.pl (Kamil Jońca) - 2016-11-29 01:50 +0100
    Re: mdadm - two questions Andy Smith <andy@strugglers.net> - 2016-11-30 06:10 +0100
      Re: mdadm - two questions   Rick Thomas <rbthomas@pobox.com> - 2016-11-30 10:50 +0100
        Re: mdadm - two questions kjonca@poczta.onet.pl (Kamil Jońca) - 2016-11-30 13:10 +0100
          Re: mdadm - two questions   Rick Thomas <rbthomas@pobox.com> - 2016-11-30 14:20 +0100
      Re: mdadm - two questions kjonca@poczta.onet.pl (Kamil Jońca) - 2016-11-30 13:00 +0100
  mdadm - Progress mails of checkarray now missing Hans Kraus <hans@hanswkraus.com> - 2016-12-10 21:10 +0100

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