Re: Attempt to Move Root
On Monday 21 December 2015 14:53:16 Stephen Powell wrote:
> On Mon, 21 Dec 2015 10:36:48 -0500 (EST), David Baron wrote:
> > On Monday 21 December 2015 10:25:15 Stephen Powell wrote:
> >> Obviously, the LILO map file is on the IDE drive. Is your /boot
> >> partition
> >> on the IDE drive? If so, you cannot remove it. The /boot partition must
> >> be a partition on a physical drive, but obviously it cannot be on the
> >> drive
> >> that you want to remove.
> >
> > The boot is not a separate partition but is a directory on the root so
> > travels with it. Copy on both old and new directories.
>
> No, that won't work. If the root filesystem is an LVM2 logical volume, then
> /boot *cannot* be part of the root filesystem. To be more rigorous, there
> will be a /boot directory in the / filesystem, but it must be an *empty*
> directory, so that another filesystem can be mounted on that directory.
> Another filesystem must get mounted on the /boot directory in the root
> filesystem, and that filesystem must be made on a partition of a *real*
> disk which is accessible via the BIOS. It cannot be an LVM2 logical
> volume. The boot partition contains the LILO map file (by default,
> /boot/map) as well as the kernel image file and the initial RAM filesystem
> image file. LILO reads these files at boot time via BIOS calls, and the
> BIOS does not support LVM2 logical volumes. You can have a physical disk
> with two partitions on it, one partition of which is an LVM2 physical
> volume which is part of an LVM2 logical volume, and the other one of which
> is a stand-alone partition which is mounted on /boot. But the filesystem
> which gets mounted on /boot must *not* be an LVM2 logical volume. I
> thought I made that clear before. Also, the LILO boot sector must be
> either on the MBR of a *real* disk, or the first sector of a partition on a
> *real* disk.
>
> > The loop that I get is something more problematic.
>
> Agreed. As I said before, there is probably something missing from the
> initial RAM file system that needs to be there for the kernel to mount an
> LVM2 logical volume.
> ===========================
>
> Could he not dd them onto another drive?
> ...
>He can copy the /boot data to another drive, not necessarily
>with dd. In fact, if he wants to be able to remove the
>existing IDE drive, he must. But he cannot copy it to an
>LVM2 logical volume. The data in /boot (after copying)
>must be on a partition on a physical disk which is accessible
>via the BIOS and not on the old IDE drive which he wishes
>to remove. The / filesystem can be an LVM2 logical volume,
>provided the initial RAM filesystem contains sufficient files
>to mount an LVM2 logical volume, but the filesystem which
>gets mounted on /boot must be made on a partition of a *real*
>disk which is not scheduled to be removed from the system.
Repeat: NO LV's
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