From: Bill Davidsen <davidsen@tmr.com>
To: Dirk Jagdmann <jagdmann@gmail.com>
Cc: linux-raid@vger.kernel.org
Subject: Re: split raid1 into to arrays
Date: Tue, 27 Mar 2007 11:57:12 -0400 [thread overview]
Message-ID: <46093ED8.8020201@tmr.com> (raw)
In-Reply-To: <5d0f60990703261954l2bb8c225ocbc3cf66e868723a@mail.gmail.com>
Dirk Jagdmann wrote:
> Hello experts,
>
> I have a raid1 array with two drives working. It /dev/md0 built from
> /dev/hda and /dev/hdb. Now I'd like to split it into two array with
> one drive each (and then later add spares to my two arrays again). I
> know that I can remove one drive from the array with: mdadm /dev/md0
> -f /dev/hdb -r /dev/hdb , however I'm not sure what the superblock of
> /dev/hdb now contains and how I could use the contents of /dev/hdb as
> the starting point for my new /dev/md1 array? I did not find anything
> in the manpage of mdadm which would provide me an automatic split.
>
> So what are your advises?
>
The fast way (not redundant):
You can mark hdb as failed, then remove it. Then you can create a new
array using hdb and a missing device.
The safe way:
get your additional drives, call then hdc and hdd just for discussion.
add hdc to the existing array and let it rebuild, then mark hdb as
failed and remove. Create a new array from hdb and hdd.
I'm sure someone will tell me if I left out a step.
--
bill davidsen <davidsen@tmr.com>
CTO TMR Associates, Inc
Doing interesting things with small computers since 1979
next prev parent reply other threads:[~2007-03-27 15:57 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-27 2:54 split raid1 into to arrays Dirk Jagdmann
2007-03-27 15:57 ` Bill Davidsen [this message]
2007-03-29 10:01 ` Dirk Jagdmann
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