From mboxrd@z Thu Jan 1 00:00:00 1970 From: maurice Subject: Odd booting problem Date: Fri, 07 Oct 2011 17:33:55 -0600 Message-ID: <4E8F8C63.1080600@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids Good day all, and Happy Thanksgiving for those in Canada! An odd problem, and hopefully someone reading this can tell me what to do differently: I am converting a machine from a single disk to one with 2 disks and 4 md RAIDs. I do not know how much detail people might like, so I will keep it as terse as possible to start: Original install CentOS 6.0, with all updates. XC86_64 kernel mdadm v3.2.2 I have added the second physical disk, and duplicated the partition table from the existing system disk created 4 md RAID1s, to be used for /boot, /, /var, and /home All were created with the second part missing: mdadm --create /dev/md0 --metadata=0.90 --level=1 --raid-disks=2 /dev/sda1 missing mdadm --create /dev/md1 --level=1 --raid-disks=2 /dev/sda2 missing mdadm --create /dev/md2 --level=1 --raid-disks=2 /dev/sda5 missing mdadm --create /dev/md3 --level=1 --raid-disks=2 /dev/sda6 missing System is booting on GRUB 0.97. Therefore I made the md0 ( /boot) with 0.90 And then made md1, md2 and md3 with 1.2 Everything looks good in /proc/mdstat I made file systems ( ext for boot and ext for others) , then copied over all data from original disk. Created the mdadm.conf file: mdadm --detail --scan > /etc/mdadm.conf I used dracut to rebuild the initramfs with the new mdadm.conf: dracut --mdadmconf --force /boot/initramfs-$(uname -r).img $(uname -r) This completed uneventfully. Edited /etc/fstab and rebooted. Now I have all my filesystems on the md devices with no complaints. Ran grub and installed on the new disk : root (hd0,0) setup (hd0) Completed successfully Next, rebooted again, and this time manually edited the grub command line to change from root=/dev/sdb2 to root=/dev/md1 And here it gets funny: Boots a bit, then I see: dracut Warning: No root device "block: /dev/md1" found. And a few seconds later we get a kernel panic. -- Cheers, Maurice Hilarius eMail: /mhilarius@gmail.com/