[Xen-users] Exporting Dom0 disks to DomU as SCSI disks does not work

["Christian Hertel" <c.hertel@xxxxxxxxxxxx>]

Hello allz,

I'm using Xen 3.0.1 on an x86_64 and tried to export 2 logical volumes
from Dom0 to DomU as sda1 and sdb1, but DomU can't mount it.
If I change it to hda1/hdb1, it works very well. Does someone have an
idea what I could be missing?

Here's my DomU Xen Startup file:

--- snip ---

kernel = "/etc/xen/kernel/linux-2.6.12.6-xenU"
memory = 512
cpus = ""         # leave to Xen to pick
name = "test1"
disk = [ 'phy:xen-volumes/test1-swap,sda1,w',
'phy:xen-volumes/test1,sdb1,w' ]
vif = [ 'bridge=xenbr0' ]
root = "/dev/sdb1 ro"

--- snap ---


Here are the kernel messages shown when trying to start my DomU:

--- snip ---

Using config file "/etc/xen/test1".
Started domain test1
Linux version 2.6.12.6-xenU (root@sarge64) (gcc-Version 3.3.5 (Debian
1:3.3.5-13)) #2 SMP Fri Feb 10 17:02:40 CET 2006
kernel direct mapping tables upto 20800000 @ 4ac000-5b2000
Built 1 zonelists
Kernel command line:  root=/dev/sdb1 ro
Initializing CPU#0
PID hash table entries: 4096 (order: 12, 131072 bytes)
Xen reported: 2992.692 MHz processor.
Dentry cache hash table entries: 131072 (order: 8, 1048576 bytes)
Inode-cache hash table entries: 65536 (order: 7, 524288 bytes)
Software IO TLB disabled
Memory: 509184k/532480k available (1564k kernel code, 22552k reserved,
587k data, 136k init)
Mount-cache hash table entries: 256
CPU: Trace cache: 12K uops, L1 D cache: 16K
CPU: L2 cache: 2048K
CPU: Physical Processor ID: 0
Brought up 1 CPUs
Grant table initialized
NET: Registered protocol family 16
xen_mem: Initialising balloon driver.
SCSI subsystem initialized
PCI: System does not support PCI
PCI: System does not support PCI
IA32 emulation $Id: sys_ia32.c,v 1.32 2002/03/24 13:02:28 ak Exp $
VFS: Disk quotas dquot_6.5.1
Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
Initializing Cryptographic API
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
Xen virtual console successfully installed as tty1
Event-channel device installed.
netfront: Initialising virtual ethernet driver.
NET: Registered protocol family 2
Registering block device major 8
register_blkdev: cannot get major 8 for sd
xen_blk: can't get major 8 with name sd
Registering block device major 8
register_blkdev: cannot get major 8 for sd
xen_blk: can't get major 8 with name sd
IP: routing cache hash table of 2048 buckets, 32Kbytes
TCP established hash table entries: 131072 (order: 9, 2097152 bytes)
TCP bind hash table entries: 65536 (order: 8, 1048576 bytes)
TCP: Hash tables configured (established 131072 bind 65536)
VFS: Cannot open root device "sdb1" or unknown-block(0,0)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on
unknown-block(0,0)

--- snap --- 


My DomU kernel has SCSI and SCSI disk support compiled in, so this
should not be the problem.


Cheers,

--
Christian Hertel
Netzwerk-Sicherheit/Netzwerk-Applikationen

infoServe GmbH
Nell-Breuning-Allee 6
D-66115 Saarbruecken

T: (0681) 8 80 08 - 59
F: (0681) 8 80 08 - 33
www.infos.de
mailto: c.hertel@xxxxxxxx 

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