This page has instructions on deleting a raid device. Have you tried it?

http://wiki.randompage.org/index.php/DistOS:Linux:RAID#Delete_a_Virtual_Device



On Tuesday 31 July 2007 17:09:35 Raphael Borg Ellul Vincenti wrote:
> Ramon... I am the culprit for that commenting out. I commented out the
> md1 as well as the entry in the fstab. I fdisked the drives and
> remarked the type of the partition as swap instead of raid. I then
> rebooted the server in the hope that nobody tries to keep the devices
> for md1 in use. I still couldn't delete the old raid device. You can
> mark the drives as failed, but you can't remove them.
>
> I am still at a loss. Oh and btw... yes you do not mount your swap
> partitions. You do swapon and swapoff. mkswap creates the appropriate
> space correctly. Its just the md1 device that gets in the way it
> seems.
>
> On 7/30/07, James Attard <[EMAIL PROTECTED]> wrote:
> > you can also create a swap file with dd, if you are really in a
> > precarious state.
> >
> > On 7/30/07, Ramon Casha < [EMAIL PROTECTED]> wrote:
> > > Hmm, I just noticed that the md1 device was commented out in
> >
> > /etc/mdadm/mdadm.conf, but I don't know if that file is auto-generated by
> > the process of assembling the devices.
> >
> > > Anyway, since this is a swap partition we don't need its previous
> >
> > contents. Can we delete and re-create it?
> >
> > > On Mon, 2007-07-30 at 08:12 +0200, Anton Xuereb wrote:
> > >
> > > On behalf of Dino Conti (He has some problems with the Mailing list
> > > right
> >
> > now)
> >
> > > Hi guys,
> > >
> > > Although the SWAP device is listed in FSTAB, it does not get mounted.
> > >
> > > After formatting the partition as SWAP, use the SWAPON command to
> > > activate
> >
> > it.
> >
> > > Please find following output from my running server
> > >
> > >
> > >
> > > [EMAIL PROTECTED] ~]# fdisk -l
> > >
> > >
> > >
> > > Disk /dev/hdg: 20.0 GB, 20020396032 bytes
> > >
> > > 255 heads, 63 sectors/track, 2434 cylinders
> > >
> > > Units = cylinders of 16065 * 512 = 8225280 bytes
> > >
> > >
> > >
> > >    Device Boot      Start         End      Blocks   Id  System
> > >
> > > /dev/hdg1   *           1        2332    18731758+  83  Linux
> > >
> > > /dev/hdg2            2333        2434      819315   82  Linux swap
> > >
> > > [EMAIL PROTECTED] ~]# mount
> > >
> > > /dev/hdg1 on / type ext3 (rw)
> > >
> > > none on /proc type proc (rw)
> > >
> > > none on /sys type sysfs (rw)
> > >
> > > none on /dev/pts type devpts (rw,gid=5,mode=620)
> > >
> > > usbfs on /proc/bus/usb type usbfs (rw)
> > >
> > > none on /dev/shm type tmpfs (rw)
> > >
> > > none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
> > >
> > > /proc on /var/named/chroot/proc type none (rw,bind)
> > >
> > > sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
> > >
> > > [EMAIL PROTECTED] ~]# cat /etc/fstab
> > >
> > > # This file is edited by fstab-sync - see 'man fstab-sync' for details
> > >
> > > LABEL=/                 /                       ext3    defaults       
> > > 1
> >
> > 1
> >
> > > none                    /dev/pts                devpts  gid=5,mode=620 
> > > 0
> >
> > 0
> >
> > > none                    /dev/shm                tmpfs   defaults       
> > > 0
> >
> > 0
> >
> > > none                    /proc                   proc    defaults       
> > > 0
> >
> > 0
> >
> > > none                    /sys                    sysfs   defaults       
> > > 0
> >
> > 0
> >
> > > LABEL=SWAP-hdg2         swap                    swap    defaults       
> > > 0
> >
> > 0
> >
> > > /dev/hdc                /media/cdrecorder       auto
> >
> > pamconsole,exec,noauto,managed 0 0
> >
> > > /dev/fd0                /media/floppy           auto
> >
> > pamconsole,exec,noauto,managed 0 0
> >
> > > dino
> > >
> > >
> > > On 7/29/07, Mario Xerri < [EMAIL PROTECTED]> wrote:
> > >
> > > Hi Raphael,
> > >
> > > Let's assess your setup from the ground up.  First of all, post the
> > > contents of /proc/mdstat (the md1 stanza is enough) and the output of:
> > >   mdadm --detail /dev/md1
> > >
> > > Your raid device might not be configured correctly.
> > >
> > > On Sun, 29 Jul 2007 01:27:11 +0200
> > >
> > > "Raphael Borg Ellul Vincenti" <[EMAIL PROTECTED]> wrote:
> > > > Yes... mkswap /dev/md1 returns that the device needs to be at least
> > > > 40K or bigger.
> > > >
> > > > That is probably because since the md1 device is still not started
> > > > (its only active) then the device is still zero.
> > > >
> > > > starting the raid device says that md1 is still in use
> > > >
> > > > Tracing the output of lsof shows that nobody is using md1 yet. My
> > > > suspicion is that the system is still thinking that md1 should be the
> > > > swap device and that is the reason why its still in use.
> > >
> > > <snip>
> > >
> > > --
> > > Mario Xerri
> > > [holo]
> > > _______________________________________________
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> > >
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> > --
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