Messages in this thread | | | Date | Wed, 14 Jan 2004 00:09:26 +0100 | From | Andreas Steinmetz <> | Subject | Re: Proposed enhancements to MD |
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Wakko Warner wrote: > > As I've understood it, the configuration for DM is userspace and the kernel > can't do any auto detection. This would be a "put off" for me to use as a > root filesystem. Configurations like this (and lvm too last I looked at it) > require an initrd or some other way of setting up the device. Unfortunately > this means that there's configs in 2 locations (one not easily available, if > using initrd. easily != mounting via loop!) >
You can always do the following: use a mini root fs on the partition where the kernel is located that does nothing but vgscan and friends and then calls pivot_root. '/sbin/init' of the mini root fs looks like:
#!/bin/sh case "$1" in -s|S|single|-a|auto) opt=$1 ;; -b|emergency) export PATH=/bin:/sbin /bin/mount /proc /bin/loadkeys \ /keymaps/i386/qwertz/de-latin1-nodeadkeys.map.gz exec /bin/sh < /dev/console > /dev/console 2>&1 ;; esac cd / /bin/mount /proc /bin/mount -o remount,rw,notail,noatime,nodiratime / /sbin/vgscan > /dev/null /sbin/vgchange -a y > /dev/null /bin/mount -o remount,ro,notail,noatime,nodiratime / /bin/mount /mnt /bin/umount /proc cd /mnt /sbin/pivot_root . boot exec /bin/chroot . /bin/sh -c \ "/bin/umount /boot ; exec /sbin/init $opt" \ < dev/console > dev/console 2>&1
And if you have partitions of the same size on other disks and fiddle a bit with dd you have perfect working backups including the boot loader code of the master boot record on the other disks. No initrd required. As an add-on you have an on-disk rescue system. -- Andreas Steinmetz
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