From: Maarten van den Berg <maarten@vbvb.nl>
To: linux-raid@vger.kernel.org
Subject: Re: RAID 0 -> 1 possible?
Date: Fri, 12 Mar 2004 00:03:23 +0100 [thread overview]
Message-ID: <200403120003.23475.maarten@vbvb.nl> (raw)
In-Reply-To: <4050CF9C.6000704@microcenter.com>
On Thursday 11 March 2004 21:44, Jeff Hoffmann wrote:
> Hello list,
>
> Is it possible to convert from RAID 0 to 1 without data loss?
No, obviously. Raid 1 is mirrored, so your useable space is only half of your
total capacity at best. Raid 0 uses the full capacity of the disks, so until
you can solve how to put twice as many data onto the same space, one cannot
convert from raid0 -> raid1 without 'losing data'...
> Given a system with two disks, three partitions on each: boot, /, and swap.
>
> Convert / from RAID 0 to 1 without requiring a backup/reinstall/restore
> scenario
Even without the <total data size> problems as outlined above, you cannot
touch either disks of a raid 0 set without destroying data, that is the whole
point of raid 0. So, even an online-migration tool sounds implaudible.
> Any RAID-mojo-masters with the answer?
I'm not a RAID-mojo-master, but then again I don't believe one needs to be one
to answer this. It stems directly from the theory of operation of the levels.
Maarten
next prev parent reply other threads:[~2004-03-11 23:03 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-11 20:44 RAID 0 -> 1 possible? Jeff Hoffmann
2004-03-11 23:03 ` Maarten van den Berg [this message]
2004-03-12 5:53 ` Clemens Schwaighofer
2004-03-12 14:44 ` Jeff Hoffmann
2004-03-12 15:28 ` Paul Clements
2004-03-12 19:31 ` Jeff Hoffmann
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=200403120003.23475.maarten@vbvb.nl \
--to=maarten@vbvb.nl \
--cc=linux-raid@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.