Re: [Xen-users] Getting frustrated with Xen

[Jonathan Dill <jonathan@xxxxxxxxx>]

Art Fore wrote:
> > > title Xen 3.0 / XenLinux 2.6
> > >        kernel /boot/xen-3.0.gz console=vga
> > >        module /boot/vmlinuz-2.6-xen root=/dev/sda2 ro console=tty0
> > >        module /boot/initrd-2.6-xen.img
> > >       
If "/boot" is on a separate partition from "/" you may need to take out 
the "/boot" from the path, at least that was a problem that I ran into 
at some point.  I think it's because the path is relative to the top of 
the partition that the files are on, and if /boot is a separate 
partition, then the files are at the top level of that filesystem, if 
that's not too confusing.
Some of the automatic scripts that are out there for setting up xen, 
like xenify.sh, seem to assume that /boot is not on a separate partition 
but part of /.  I also ran into problems with "/" fs other than ext3 due 
to assumption of scripts, I am sure there is a way to fix it, but I 
don't think the extra effort is really going to buy all that much extra 
performance.
And of course as always, KNOPPIX is your friend :) or sometimes I used 
Ubuntu Desktop CD, then you can boot into the CD, mount your root 
partition and chroot to it.  Also handy you can use the "--bind" or "-o 
bind" option to mount to make /proc and /dev (if you are using udev or 
devfs) available when you chroot to the root partition, for example:
mkdir /mnt/sda1
mount /dev/sda1 /mnt/sda1
mount --bind /proc /mnt/sda1/proc
mount --bind /dev /mnt/sda1/dev
chroot /mnt/sda1
mount -a
# do stuff, edit / run grub etc
umount -a
exit

So far, I have had the best results with:

1. "/" of dom0 is a "real" partition and not LVM
2. /boot is a subdir in / and not on a separate partition
3. / is formatted with ext3 filesystem (not reiserfs)
4. allow 6.5 GB for /

Luckily, I do not have to be frugal with disk space, in fact my 
partition layout really looks like this:
sda1 /media/sda1 32 MB Dell Utility partition FAT32
sda2 / 6.5 GB ext3
sda3 /media/sda3 6.5 GB ext3 (2nd root partition for future upgrade)
sda4 extended partition
sda5 swap 512 MB
sda6 LVM VolGroup0 remainder of space

Jonathan

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