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

[David Coulson <david@davidcoulson.net>]

/proc/mdstat is a kernel provided method to access RAID information - 
Any distribution will have it, assuming it is using the software RAID 
driver in the kernel.

Cliff Pankonien wrote:
> cat /proc/mdstat should tell you, at least if it's debian/ubuntu, 
> although i assume other distros use mdadm as well...
>
> 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] 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 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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