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
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