From mboxrd@z Thu Jan 1 00:00:00 1970 From: Justin Piszcz Subject: Re: How do I get rid of old device? Date: Wed, 16 Jan 2008 19:35:41 -0500 (EST) Message-ID: References: <18318.36828.106749.497307@notabene.brown> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Return-path: In-Reply-To: <18318.36828.106749.497307@notabene.brown> Sender: linux-raid-owner@vger.kernel.org To: Neil Brown Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On Thu, 17 Jan 2008, Neil Brown wrote: > On Wednesday January 16, jpiszcz@lucidpixels.com wrote: >> p34:~# mdadm /dev/md3 --zero-superblock >> p34:~# mdadm --examine --scan >> ARRAY /dev/md0 level=raid1 num-devices=2 >> UUID=f463057c:9a696419:3bcb794a:7aaa12b2 >> ARRAY /dev/md1 level=raid1 num-devices=2 >> UUID=98e4948c:c6685f82:e082fd95:e7f45529 >> ARRAY /dev/md2 level=raid1 num-devices=2 >> UUID=330c9879:73af7d3e:57f4c139:f9191788 >> ARRAY /dev/md3 level=raid0 num-devices=10 >> UUID=6dc12c36:b3517ff9:083fb634:68e9eb49 >> p34:~# >> >> I cannot seem to get rid of /dev/md3, its almost as if there is a piece of >> it on the root (2) disks or reference to it? >> >> I also dd'd the other 10 disks (non-root) and /dev/md3 persists. > > You don't zero the superblock on the array device, because the array > device does not have a superblock. The component devices have the > superblock. > > So > mdadm --zero-superblock /dev/sd* > or whatever. > Maybe > mdadm --examine --scan -v > > then get the list of devices it found for the array you want to kill, > and --zero-superblock that list. > > NeilBrown > Thanks, will keep this in mind for the future-- I just checked and the dd's have finished and there is no longer a /dev/md3, but mdadm --zero-superblock /dev/sd[c-l] would have been much easier. Justin.