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55 lines
2.3 KiB
Markdown
55 lines
2.3 KiB
Markdown
---
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title: /boot to own partition
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layout: default
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created: 2008-09-12 21:53:07 +0200
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updated: 2009-03-31 11:48:44 +0200
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toc: false
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tags:
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- know-how
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- software
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- linux
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- software
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- bootup
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---
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Using an emulated SCSI-adapter in VMware with a very large root disk may give you either
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Error 18: Selected Cylinder exceeds maximum supported by BIOS
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or
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Error 16: Inconsistent Filesystem Structure
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This is because the *initrd* image is created (maybe only partially) outside the 1024-cylinder boundary accessible by
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the VMware BIOS. The only stress-free solution is to move `/boot` to its own partition directly at the beginning of the
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virtual disk. There is a nice how-to from [Tek Guru](http://tekguru.wordpress.com/2007/09/04/howto-moving-boot-to-its-own-partition/).
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So use your favourite partitioner (I prefer GPartEd from the [SysRescCD](http://www.sysresccd.org/).) and move the
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beginning of the first partition about 100 MiB to the right to add a new *ext3* partition in front of it. 100 MiB
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should be enough for most people. You may need to use `fdisk`'s expert menu to fix the partition ordering if you can't
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live with a `/dev/sda3` at the beginning of the disk.
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Afterwards mount both partitions, the future `/boot` and the system partition and copy the contents of `/boot` to the
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new and empty partition. Rename the old boot-folder and create a new empty one. Edit the `fstab` and add following line:
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/dev/sda3 /boot ext3 rw 0 1
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(Tek Guru used `ro` here to mount the partition read-only. As Ubuntu often updates the initrd, `rw` is the better way.)
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Now open the `grub/menu.lst` and remove the `/boot` in front of the entries. Since grub sees the plain partition,
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everything is in the root directory at this point. Maybe you also have to change the `root hd(0,X)` if your `X` is
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not `0` (= the first partition).
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Using the rescuecd, you can now boot your system using the `rescuecd boothd=/dev/sda2` (`root=/dev/sda2` in recent
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versions) parameter. If the system is up, run
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grub-install /dev/sda
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to finally install grub correctly. You should now be able to boot.
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<p><div class="noteclassic" markdown="1">
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You can use the same technique to get around the 137 GB / 128 GiB limit of some
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older mainboards. Just create a `/boot` partition at the beginning and after the kernel has loaded the controller
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module, the (BIOS-)limit is gone.
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</div></p>
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