Xen users - Feb 2006 - AW: Exporting Dom0 disks to DomU as SCSI disks doesnot work

Hello Digvijoy,
> Does your kernel have inbuilt support for Logical Volumes 
> ,because your ouptut shows VFS is unable to mount root ,which 
> means dm-mod and multidevice modules  wasnt compiled into the kernel.
Multi-device support is compiled into my DomU kernel, device-mapper is
built as a module.
But I don''t think this has something to do with my problem because
I''m
exporting 2 logical volumes, not the LVM physical disk, so my DomU
kernel shouldn''t care about it. As I mentioned, it works if I export
the
volumes as hda1 / hdb1.

I can provide my Dom0 and/or DomU kernel .config file if needed.

Cheers,
Christian

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Christian , 
I am not able to understand this problem right away ,but SCSI major
number is 8 and i can see your kernel cribbing about registering block
device with  major number 8 when its booting up,..just before it
panics ....below , i have separated it with equal to marks

can you paste the output for the successfull hda bootup ??

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)




On Mon, 2006-02-13 at 11:06 +0100, Christian Hertel
wrote:
> Hello Digvijoy,
> 
> > Does your kernel have inbuilt support for Logical Volumes 
> > ,because your ouptut shows VFS is unable to mount root ,which 
> > means dm-mod and multidevice modules  wasnt compiled into the kernel.
> 
> Multi-device support is compiled into my DomU kernel, device-mapper is
> built as a module.
> But I don''t think this has something to do with my problem because
I''m
> exporting 2 logical volumes, not the LVM physical disk, so my DomU
> kernel shouldn''t care about it. As I mentioned, it works if I
export the
> volumes as hda1 / hdb1.
> 
> I can provide my Dom0 and/or DomU kernel .config file if needed.
> 
> Cheers,
> Christian

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> > 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
> 
> Vs 
> 
> NET: Registered protocol family 2
> Registering block device major 3
> 
> I feel its a compliation issue of DomU  ,attach .config for 
> DomU , ill be able to tell which one is missing in SCSI,my 
> DomU  boots with SCSI and IDE equally well...lets see
Ok, I attached it to this mail.
Meanwhile, I''ll try to make mrproper and recompile it, perhaps there
really was a compilation issue last time.

Thank you for your help!

Christian



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This is my 2.6.11-1.1360FC$4xenU as different from yours and it boots
when physical devices are exported as SCSI, I am not a SCSI expert so
wont be able to tell you why , try this and mail the result...I have
also attached the file 

May be other people on the list can tell ???
#
# SCSI device support
#
CONFIG_SCSI=m
CONFIG_SCSI_PROC_FS=y

#
# SCSI support type (disk, tape, CD-ROM)
#
CONFIG_BLK_DEV_SD=m
CONFIG_CHR_DEV_ST=m
CONFIG_CHR_DEV_OSST=m
CONFIG_BLK_DEV_SR=m
CONFIG_BLK_DEV_SR_VENDOR=y
CONFIG_CHR_DEV_SG=m

#
# Some SCSI devices (e.g. CD jukebox) support multiple LUNs
#
CONFIG_SCSI_MULTI_LUN=y
CONFIG_SCSI_CONSTANTS=y
CONFIG_SCSI_LOGGING=y

#
# SCSI Transport Attributes
#
CONFIG_SCSI_SPI_ATTRS=m
CONFIG_SCSI_FC_ATTRS=m
CONFIG_SCSI_ISCSI_ATTRS=m

#
# SCSI low-level drivers
#
CONFIG_SCSI_SATA=y
# CONFIG_SCSI_DEBUG is not set































On Mon, 2006-02-13 at 11:49 +0100, Christian Hertel
wrote:
> > > 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
> > 
> > Vs 
> > 
> > NET: Registered protocol family 2
> > Registering block device major 3
> > 
> > I feel its a compliation issue of DomU  ,attach .config for 
> > DomU , ill be able to tell which one is missing in SCSI,my 
> > DomU  boots with SCSI and IDE equally well...lets see
> 
> Ok, I attached it to this mail.
> Meanwhile, I''ll try to make mrproper and recompile it, perhaps
there
> really was a compilation issue last time.
> 
> Thank you for your help!
> 
> Christian
> 

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