Bug#328698: When root is installed on raid1 md0 starts in degaraded mode

[lsorense@csclub.uwaterloo.ca (Lennart Sorensen)]

On Fri, Sep 16, 2005 at 11:25:22PM +0300, Markus Bjorklof wrote:
> Package: install
> Severity: normal
> 
> 
> If you make clean install with root on raid1 (mirror) md0 (root) starts in
> degraded mode. You can mdadm "/dev/md0 --add /dev/other_disk_partition" to
> add other disk to array but it gets kicked out after reboot.
> 
> Problem lies in mkinitrd, info from "man mdadm":
> "If both mdadm(8) and raidtools2 are installed, the former is preferred.  At
> the moment, mkinitrd uses the -D option of  mdadm(8)  to  discover  the
> constituent devices.  This means that only devices that are part of the
> array at the time that mkinitrd is run will be used later on.  This problem
> does not exist when raidtools2 is used."
> 
> Quick and dirty solution:
> mdadm /dev/md0 --add /dev/other_disk_partition
> Wait for resync to complete
> apt-get --purge remove kernel-image-version
> apt-get install kernel-image-version

Or slightly quicker: mkinitrd -o /boot/initrd-.... (whatever it is)

No need to uninstall/reinstall the kernel to do that.

Len Sorensen