Re: ANNOUNCE: mdadm 2.2 - A tool for managing Soft RAID under Linux

["David M. Strang" <dstrang@shellpower.net>]

On Dec 6, 2005, Andre Noll wrote:

> Don't we need /dev/console as well?
>
> About the example script:
>
> ==============================================
> #!/bin/sh
>
> echo 'Auto-assembling boot md array'
> mkdir /proc
> mount -t proc proc /proc
> if [ -n "$rootuuid" ]
> then arg=--uuid=$rootuuid
> elif [ -n "$mdminor" ]
> then arg=--super-minor=$mdminor
> else arg=--super-minor=0
> fi
> echo "Using $arg"
> mdadm -Acpartitions $arg --auto=part /dev/mda
> cd /
> mount /dev/mda1 /root ||  mount /dev/mda /root
> umount /proc
> cd /root
> exec chroot . /sbin/init < /dev/console > /dev/console 2>&1
> =============================================
>
> (a) mkdir, mount, umount won't be found. 'busybox mkdir /proc'
> etc. does the job though. Or, create symlinks.
>
> (b) Does mdadm --auto=/dev create the /dev directory?  If if does
> not, the script has to create it. Otherwise, the mdadm manpage should
> mention this ;)
>
> (c) Documentation/filesystems/ramfs-rootfs-initramfs.txt recommends to
> mount --move . /
> before the final chroot.
>

I'm not very initrd savvy; and I'm having a heck of a time making the 
initramfs instructions in mdadm work. Does anyone have a working example of 
them?

I'm attempting to use the following 'init' file -- based on some of the 
observations that Andre made.

#!/bin/sh

/bin/busybox echo "Auto-assembling boot md array..."
/bin/busybox mkdir /proc
/bin/busybox mount -t proc proc /proc
/bin/busybox echo "Using /dev/md_d0..."
/bin/mdadm -A /dev/md_d0  --auto=part /dev/sdb1
cd /
/bin/busybox mount /dev/md_d0p1 /root
/bin/busybox umount /proc
cd /root
exec /bin/busybox chroot . /sbin/init < /dev/console > /dev/console 2>&1

I've added a /dev directory to the init.cpio.gz as well. It seems like I may 
have some cart before the horse syndrome tho, as mdadm cannot find 
/dev/sdb1... which I'm assuming is because udev hasn't started.

Help!

-- David M. Strang