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======  Debian or Ubuntu  ======



===== Preparing an existing installation for AoE =====

You can either work with an installation on
   - a physical disk on a client machine or
   - a ''chroot(8)'' environment operating on a loopback-mounted disk image

Install the ''aoetools'' package. For Ubuntu, you need to put the
''universe'' part of the distribution into ''/etc/apt/sources.list'',
for example:

   deb http://archive.ubuntu.com/ubuntu feisty main universe

Install a kernel image that includes the ''aoe'' driver, i.e. the
stock ''linux-image-2.6.18-*'' images included with Debian 4.0 and the
''linux-image-2.6.20-*'' images included with Ubuntu "Feisty Fawn".

Create two scripts shown below. These scripts have to be executable.
   * ''/etc/initramfs-tools/hooks/aoetools'' will copy the ''aoe'' kernel module and ''/sbin/aoe-discover'' to the initial ramdisk.
   * ''/etc/initramfs-tools/scripts/local-top/aoetools'' is copied to the ram disk and run at boot-time, just before the root filesystem is mounted. If the root device string looks like an AoE target, it brings up all recognized Ethernet interfaces and activates the AoE driver.

After you have made sure that ''/etc/initramfs-tools/initramfs.conf''
contains the line
   BUSYBOX=y
you can update the initial ramdisk:
   # update-initramfs -u -k all

Update your ''/etc/fstab'' (or create a new one) as shown in the
example below. The Linux AoE driver puts all device files into
''/etc/etherd/''. Entire virtual disks are assigned names ''eX.Y''
where **(X Y)** is a unique AoE shelf:slot number within the local
network. Individual partitions on those disks are assigned names
''eX.YpZ''
<code>
# file system      mount point   type    options                  dump pass
/dev/etherd/e0.0p1 /             ext3    defaults                 0    1
/dev/etherd/e0.0p2 none          swap    sw                       0    0
proc               /proc         proc    defaults                 0    0
</code>

Update ''/boot/grub/menu.lst'' (or create a new one) so that the root
device is passed to the kernel (in this example via the parameter
''root=/dev/etherd/e0.0p1'').

If the modifications were applied to a physical disk on the client
machine, you can now [[sanboot:transfer|transfer the contents of your
physical disk to the SAN target]].

If the image you wish to export to client systems was modified directly,,
you can now [[sanboot:aoe|make the contents of that image available
via AoE]].

FIXME Test booting from chroot-generated image

==== Hint ====
   * If the system hangs before the root device has been mounted, passing ''break=mount'' on the command line will spawn a shell before ''scripts/local-top/aoetools'' is run. This should allow for further debugging.



==== Scripts ====
=== /etc/initramfs-tools/hooks/aoetools ===
<code bash>
#!/bin/sh

set  -e

PREREQ=""

prereqs()
{
	echo "$PREREQ"
}

case $1 in
prereqs)
	prereqs
	exit 0
	;;
esac

. /usr/share/initramfs-tools/hook-functions

[ -x /sbin/aoe-discover ] && copy_exec /sbin/aoe-discover /sbin
manual_add_modules aoe
</code>

=== /etc/initramfs-tools/scripts/local-top/aoetools ===
<code bash>
#!/bin/sh

set -e

PREREQ="udev"

prereqs()
{
	echo "$PREREQ"
}

case $1 in
prereqs)
	prereqs
	exit 0
	;;
esac

case $ROOT in
/dev/etherd/e*)
	# INTERFACES=`awk -F: '/eth[0-9]*:/ { print $1 }' < /proc/net/dev`
	INTERFACES=`sed -ne '/eth.*:/{s/:.*$//;p;}' < /proc/net/dev`
	for i in $INTERFACES; do
		echo Bringing up interface $i for AoE
		ifconfig $i up
	done
	sleep 5
	modprobe aoe
	aoe-discover
	;;
esac
</code>

===== Preparing an existing installation for iSCSI =====
TBD

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