Am 25.08.2012 13:13, schrieb Florian Philipp:
> Hi list!
>
> I've just completed migrating my system from one hard disk to another.
> Although the new disk reports 512 byte blocks just like the old one, I
> thought it would be a good idea to re-align the partitions anyway. I've
> done it this way:
>
> 1. Create new partitions with gparted, at least as large as the old ones
> (rounded up to full MiB).
>
> 2. `dd` from the old to the new disk.
>
> 3. `resize2fs` to match the new sizes.
>
> 4. Install grub ("root (hd1,4); setup (hd1); setup (hd1,4)")
>
> 4. Swap disks and reboot.
>
> Unfortunately, the system failed to find the boot loader. There was no
> grub error. The disk was simply skipped, as if it was unformatted.
>
> The following steps were taken:
>
> 1. Verified that the `dd`ed partitions were sane.
>
> 2. Reinstalled grub from live-CD chroots several times.
>
> 3. Installed grub on a memory stick and booted from that.
>
> At this point, my partition table looked like this:
>
> Number Start End Size Type File system Flags
> 1 1049kB 316MB 315MB primary ntfs
> 2 316MB 750GB 750GB extended
> 5 317MB 424MB 107MB logical ext2 boot
> 6 425MB 22.4GB 22.0GB logical ext3
> 7 22.4GB 28.9GB 6441MB logical linux-swap(v1)
> 8 28.9GB 750GB 721GB logical
>
> The first logical partition was the boot partition. The first primary
> partition was a laptop-specific recovery partition. This setup was
> identical to the old one except that I removed a primary partition which
> resided /after/ the end of the extended partition.
>
> At this point, I've reformatted the first primary partition as ext2 and
> moved boot to this partition. This solved my problem.
>
> Now, my question is: Why does this work and the old solution doesn't?
> Why can't grub boot from a logical partition when it's MiB-aligned? I've
> changed nothing that should affect the MBR. Then why wasn't at least the
> stage 1 detected?
>
> Thanks in advance!
> Florian PhilippTurns out, I was wrong in thinking the immediate problem was solved. In fact, the system just booted of the memory stick without me noticing. I've now finally solved by re-creating the boot partition without MiB-alignment, just good old cfdisk. So, the working partition scheme looks like this: Number Start End Size Type File system Flags 1 32.3kB 316MB 316MB primary ext2 boot 2 316MB 750GB 750GB extended 5 317MB 424MB 107MB logical ext2 6 425MB 22.4GB 22.0GB logical ext3 7 22.4GB 28.9GB 6441MB logical linux-swap(v1) 8 28.9GB 750GB 721GB logical Is there an explanation for this? Regards, Florian Philipp
signature.asc
Description: OpenPGP digital signature
