On 06/21/2012 04:11 AM, Arun Khan wrote: > On Wed, Jun 20, 2012 at 10:06 AM, Arun Khan<knura9 at gmail.com> wrote: >> On Wed, Jun 20, 2012 at 1:00 AM,<m.roth at 5-cent.us> wrote: >> >> .... snip .... >> >>> For one thing, edit grub.conf and get *rid* of that idiot rhgb and quiet, >>> so you can actually see what's happening. Sounds to me as though it's >>> trying to switch root to a real drive from the virtual drive of the ramfs, >>> and it's not working. One thing you *might* also try is before you boot, >>> edit the kernel line in grub, and add rdshell at the end, so you boot into >>> grub's rudimentary shell if/when it fails, and you can look around and >>> find what it's seeing. >> >> Will try your suggestion and report back. > As mentioned already there are no issues with both disks connected. > In this scenario, I have changed the "Partition ID" of the > partitionable RAID1 partitions /dev/md_d0p1 and /dev/md_d0p2 to 'fd' > and then rebooted the system (recall earlier these partitions had > Id=83). > > I also made the suggested changes to /boot/grub/grub.conf by Mark > > Rebooted the system with both disks connected - system boots fine. > Messages are displayed including the md driver binding /dev/sda and > /dev/sdb. The "root" device /dev/md_d0p1 is detected and it is > mounted on / and life is hunky dory. > > Reboot the system with disk1 removed, the kernel boots, the 'md' > driver tries to bind sda. At this point the systems seems to hang > for a few seconds and then 'dracut' reports that it cannot find > /dev/md_dop1 (the root partition) > > dracut Warning: No root device "block:/dev/md_d0p1" found sounds like the mirror is not in synch - when it is running with both drives, what does >cat /proc/mdstat show?? > > Console image pasted here<http://imagebin.org/217229> > > In the "rdshell" environment I can see that /etc/mdadm.conf is defined > but beyond this I don't know what to look for. > > Changing the Partition Id for the RAID1 partitions to 'fd' does not help. > > Any further suggestions and/or comments? > > -- Arun Khan > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos