Mike Leone on 29 Aug 2007 22:12:13 -0000


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Re: [PLUG] How to break a software RAID mirror?

Brian Stempin wrote:
Daniel,
Another way to see is to read the mdadm config file.
sudo vi /etc/mdadm/mdadm.conf

Better to do "sudo more /etc/mdadm/mdadm.conf", if all you're going to do is read. Less chance of inadvertently changing something.


Brian
On 8/29/07, * Daniel.G.Roberts@sanofi-aventis.com <mailto:Daniel.G.Roberts@sanofi-aventis.com>* <Daniel.G.Roberts@sanofi-aventis.com <mailto:Daniel.G.Roberts@sanofi-aventis.com>> wrote:

    I think I am running mirrored pair..RAID0..how can I tell for sure?
    Thanks
    Dan

    -----Original Message-----
    From: plug-bounces@lists.phillylinux.org
    <mailto:plug-bounces@lists.phillylinux.org>
    [mailto:plug-bounces@lists.phillylinux.org
    <mailto:plug-bounces@lists.phillylinux.org>] On Behalf Of David Coulson
    Sent: Wednesday, August 29, 2007 4:04 PM
    To: Philadelphia Linux User's Group Discussion List
    Subject: Re: [PLUG] How to break a software RAID mirror?

    What RAID level.

    You can break RAID-1, and it'll keep working. It'll complain it's
    missing part of the array, but it will still work.

    mdadm has a fail (mdadm -f /dev/md0 /dev/sdb1 or something) option that
    will allow you to fake a failed drive, then you can use mdadm to take it
    out of the array.

    Daniel.G.Roberts@sanofi-aventis.com
    <mailto:Daniel.G.Roberts@sanofi-aventis.com> wrote:
     > Hi All
     >
     > My system has two scsi disks that are software RAIDED together and
     > mounted.
     > I also have a third disk which has a bootable linux OS.
     > My question is..
     > Can I safely break the software mirror between the first two scsi
     > disks without losing data on the first disk so that I can use the
     > second disk for something brand new?
     > Thanks for any advice?!
     > Sincerely
     > DAn
     >
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