Re: [Xen-devel] xen and reiserfs

[Robin Green <greenrd@xxxxxxxxxxxxx>]

On Mon, 21 Feb 2005, Jim Martin wrote:

> Thanks Robin !
> This got me a lot further on..but now I'm seeing this..
Woops! My mistake. Do this instead:

 mkdir /mnt/suse
 mount -t reiserfs -o ro /dev/hdb2 /mnt/suse
 rm -f /boot/initrd-2.6.10-1.1148_FC4xenU.img

 # all on one line
 mkinitrd --fstab=/mnt/suse/etc/fstab /boot/initrd-2.6.10-1.1148_FC4xenU.img 
2.6.10-1.1148_FC4xenU

 umount /mnt/suse  # DO NOT OMIT THIS STEP!

That should detect the root filesystem type correctly. Then try
xm create again.

--
Robin

> [root@groucho xen]# xm create -c suse
> Using config file "suse".
> Started domain suse, console on port 9607
> ************ REMOTE CONSOLE: CTRL-] TO QUIT ********
> Linux version 2.6.10-1.1148_FC4xenU (bhcompile@xxxxxxxxxxxxxxxxxxxxx) (gcc 
> version 3.4.3 20050209 (Red Hat 3.4.3-19)) #1 SMP Sat Feb 19 15:28:44 EST 
> 2005
> BIOS-provided physical RAM map:
> Xen: 0000000000000000 - 0000000004000000 (usable)
> 64MB LOWMEM available.
> Using x86 segment limits to approximate NX protection
> DMI not present.
> IRQ lockup detection disabled
> Built 1 zonelists
> Kernel command line:  root=/dev/hdb2 ro
> Initializing CPU#0
> > > > snip<<<<
> Creating root device
> Mounting root filesystem
> VFS: Can't find ext3 filesystem on dev hdb2.
> mount: error 22 mounting ext3
> mount: error 2 mounting none
> Switching to new root
> switchroot: mount failed: 22
> umount /initrd/dev failed: 2
> Kernel panic - not syncing: Attempted to kill init!
> <0>Rebooting in 1 seconds..
>
> [root@groucho ~]# xm list
> Name              Id  Mem(MB)  CPU  State  Time(s)  Console
> Domain-0           0      121    0  r----   5515.8
> suse               7       64    0  ---s-      1.0    9607
>
> SO CLOSE.....
>
> Jim
> ---------------------------------------------------------------
>
>
>
>
> Robin Green wrote:
>
> > On Mon, 21 Feb 2005, Jim Martin wrote:
> >
> > > Hi
> > > I'm running Xen on Fedora core 3...
> > > uname -a
> > > Linux groucho 2.6.10-1.1148_FC4xen0 #1 SMP Sat Feb 19 15:15:24 EST 2005 
> > > i686 i686 i386 GNU/Linux
> > > # xm list
> > > Name              Id  Mem(MB)  CPU  State  Time(s)  Console
> > > Domain-0           0      121    0  r----    140.9
> > >
> > > What I'm trying to do is get SuSE 9.2 to come up in it's own domain..
> > > /dev/hda2 = root for FC-3
> > > /dev/hdb2 = root for SuSE 9.2
> > >
> > > My config file in /etc/xen (suse)
> > > # cat suse
> > > kernel ="/boot/vmlinuz-2.6.10-1.1148_FC4xenU"
> > > memory = 64
> > > name = "suse"
> > > nics = 1
> > > disk = ['phy:hdb2,hdb2,w']
> > > root = "/dev/hdb2 ro"
> > >
> > > My problem...
> > > When I run 'xm create -c suse' everything seems fine right up to the point 
> > > of
> > > mounting root and I get this error:
> > > md: ... autorun DONE.
> > > Kernel panic - not syncing: VFS: Unable to mount root fs on 
> > > unknown-block(3,66)
> > > <0>Rebooting in 1 seconds..
> > >
> > > This is a reiserfs /dev/hdb2 - does this xen kernel support reiserfs ?
> > > Or is my config file wrong ?
> >
> > Xen kernels have no problem with reiserfs (indeed, they should work with 
> > any filesystem). Your problem is due to the fact that you are booting with
> > a Fedora kernel, which unlike (IIRC) the suse kernels, has reiserfs as a
> > module, not compiled in.
> >
> > Not to worry, all you have to do is add an initrd line. Unfortunately,
> > the kernel-xenU package from Fedora does not currently ship with an initrd, 
> > so I think you'll have to build one yourself. Try this command
> > (I haven't tested it, but it should work):
> >
> >  mkinitrd /boot/initrd-2.6.10-1.1148_FC4xenU.img 2.6.10-1.1148_FC4xenU
> >
> > Then add
> >
> >  ramdisk=/boot/initrd-2.6.10-1.1148_FC4xenU.img
> >
> > to your config file in /etc/xen.
> >
> > The kernel will load the necessary module(s) automatically so it should
> > not be necessary to modify the initrd produced by mkinitrd.
> >
> > Hope this helps,

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