Date: Wed, 8 May 2013 15:21:44 +0400 From: misha shiposh <netsferato@...il.com> To: owl-users@...ts.openwall.com Subject: Re: software raid with device busy status Hi Bernhard! In my case, I change my root fs from raid to second disk. And the second disk is not any more in raid array. After reboot, os booted from second disk, but array, as I think, array monitor still holds /dev/hda1 and I cannot stop this array and do any action with first disk.... By the way, /dev/md0 (array dev) is not mounted. mdadm says that the status is clean and degraded. And the state of hda1 is still active sync.... mdadm --zero-superblock /dev/hda1 I did it on the second disk, and it's ok. But I cannot do this on the first disk (/dev/hda1). On Tue, May 7, 2013 at 6:29 PM, Bernhard Fischer <fischerb@...cher-ing.de>wrote: > Hi Misha, > > you can't stop /dev/md0 if it's your root filesystem. It's like cutting > the branch you are sitting on. > > If you remove a device from a raid set, you may also clear the > superblock for reusage. > > mdadm --zero-superblock /dev/hda1 > > or do it the hard way > > dd if=/dev/zero of=/dev/hda1 > > Check the other devices for proper bootloader installation. Otherwise > your machine will refuse booting afterwards. You have to install the > bootloader on every single device in the RAID set, to get it booting in > the case of a disaster. > > > -bernhard > > Am Di 07.05.2013 15:45 schrieb misha shiposh <netsferato@...il.com>: > > > Good day, guys! > > > > I was wander, if there are any faq or guides of how to totally destroy > > raid > > array? > > > > In my case I'll trying in a virtual sandbox to emulate this thing, > > without > > success... > > > > After I create software raid 1, I'll try to delete it with the > > following > > steps: > > > > Also this raid is root for my os, > > > > first delete one of disk > > mdadm --manage /dev/md0 --fail /dev/hda1 > > mdadm --manage /dev/md0 --remove /dev/hda1 > > > > then if I try to stop array md0 it says that it's busy.... no > > wonder... > > then I'll try to boot from removed disk and after that totally > > removing > > raid. > > > > and no success! > > > > stopping raid says it's busy, other way trying to delete the second > > disk > > without any result because of device is busy... > > > > is there any way to totally destroy raid ? > > > > > > Thanks! > > > Content of type "text/html" skipped
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