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Raid solution

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NOTE: The title of this document is incorrect. FAT32 has a maximum file size of 4GB. I think that the author must have confused the 2GB limitation of vfat on Linux.

NOTE-II: the 2GB limit on Linux is no more, at least it has been fixed in the kernel 2.6.x in recent versions. There still may be troublemaker software.

Requirements: Edit

  • Debian root image with internet connectivity
  • 2gb blank image file for Gentoo
  • Up to 6 (maximum) blank image files as needed to make the install you want
  • 256MB+ of swap space (highly recommended)
  • 64MB ram assigned to coLinux

Debian Setup Edit

In this example:

  • /dev/cobd0 will be debian
  • /dev/cobd1 will be the image you choose for gentoo
  • /dev/cobd4 wil be swap

Boot debian. Install Gentoo to /dev/cobd1 In the Gentoo Installation guide you will be starting from creating the filesystem.

Gentoo setup specifics Edit

Kernel source Edit

Install vanilla-sources-2.4.24 (or whatever the latest colinux supported kernel is)

  • USE="-*" emerge /usr/portage/sys-kernal/vanilla-sources/vanilla-sources-2.4.24.ebuild

Editing fstab:

  • set swap to /dev/cobd7
  • set root to /dev/cobd6

Prepare for the Gentoo environment Edit

Backup the xml config file as debian.xml

Some naming conventions for this part. I named my array files cobd0,cobd1.... cobd5 (hence, I had 6 of them)

now edit the config file and set (as necessary)

device 0 -> cobd0
device 1 -> cobd1
........
device 5 -> cobd5
device 6 -> gentoo image (that's why we set gentoo to boot from cobd6)
device 7 -> swap

verify memory is 64 megs or more.

Boot Gentoo Edit

Your Gentoo image should boot ok. This is where you should complete your Gentoo setup. If you are having problems consult me (s0be) on irc and I can try to help you out.

NOW, we need to set up a environment conducive to configuring our real install.

You will need:

  1. samba
  2. mdadm
  3. appropriate filesystem tools (if you choose not to use ext3)
  4. colinux source (for the kernel patches)

so you should do: USE="-*" emerge samba mdadm

When that is finished, grab the colinux source and uncompress it into /usr/src go into /usr/src/linux-2.4.24 and patch the sources with the latest colinux patch.

Kernel Configuration Edit

patch -p1 --dry-run < ../colinux-<version>/patch/linux

if it all succeeds, (no patch fails), do it without --dry-run

now, copy the config file out of the colinux source

cp ../colinux-<version>/conf/linux-config ./.config

now, make oldconfig

make oldconfig

now, make menuconfig

make menuconfig

some key points to enable:

  • /dev filesystem support
    • mount/devfilesystematboot
  • raid support (compiled in, not mudles)
    • allraidlevels
  • ext3(or any filesystems you want to use, built in)
  • smbfs and nfs built in

now, make the kernel image.

make dep
make clean
make vmlinux

once that finishes, you need to getthekernelimageoutofcolinux.

reboot gentoo with that new kernel.

Creating a raid Edit

use mdadm to create the span of cobd0->cobd5

mdadm --create --verbose /dev/md0 --level=linear --raid-devices=6  /dev/cobd{0,1,2,3,4,5}

(using bash list scripting)

now, we need to create a /etc/mdadm.conf:

mdadm --detail --scan > /etc/mdadm.conf

which needs one more line added to list devices...

nano -w /etc/module.conf

add:

DEVICE	/dev/cobd0 /dev/cobd1 /dev/cobd2 /dev/cobd3 /dev/cobd4 /dev/cobd5

as the first line.

Using the raid Edit

Make the filesystem

mkfs.ext3 /dev/md0

mount the filesystem

mount /dev/md0 /mnt/gentoo

return to gentoooncoLinux and do your real install in this /mnt/gentoo system. make sure to emerge samba again and mdadm again. copy over mdadm.conf.

once the install is complete, you'll need to edit the config file one last time, to change the root= line to root=/dev/md0

it should 'just work now'

any problems/corrections, e-mail paterley@drunkencodepoets.com


MassTranslated on Sun Apr 23 17:36:43 UTC 2006
ManuallyAdjusted on 20 July 2008

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