Thank you to all who helped. I actually didnt need to do anything. It
was just Slackware, and devfs that was the issue. You need it turned on,
and I had it off.
Derek R. Meiresonne
eTecc Communications, Inc.
www.eTecc.com
Anthony Brock wrote:
Derek,
First, you don't need the ubd* devices on the host. They're useless in this
context. Second, you need to boot the UML instance by specifying the ubd
devices. For example, the following might be an acceptable permutation of
your command:
/root/uml/linux-2.6.12.3/linux ubd0=/backup/Slackware-10.1.ext2-795
eth0=tuntap,,,207.230.28.10 mem=64M umid=795
This should get you pointed in the right direction. Additional "drives" can
be specified with additional "ubd" devices (i.e., "ubd0=/root_filesystem
ubd1=/data_file_1 ubd2=/data_file_2"). The file you reference for device
"ubd0" will automatically become your "root". This can be accessed with
major 98 minor 0. So, you'll need devices similar to the following on your
UML filesystem:
brw-rw---- 1 root disk 98, 0 Oct 1 08:23 /dev/ubda
brw-rw---- 1 root disk 98, 1 Oct 1 08:23 /dev/ubda1
brw-rw---- 1 root disk 98, 2 Oct 1 08:23 /dev/ubda2
brw-rw---- 1 root disk 98, 3 Oct 1 08:23 /dev/ubda3
brw-rw---- 1 root disk 98, 4 Oct 1 08:23 /dev/ubda4
brw-rw---- 1 root disk 98, 16 Oct 1 08:23 /dev/ubdb
brw-rw---- 1 root disk 98, 17 Oct 1 08:23 /dev/ubdb1
brw-rw---- 1 root disk 98, 18 Oct 1 08:23 /dev/ubdb2
brw-rw---- 1 root disk 98, 19 Oct 1 08:23 /dev/ubdb3
brw-rw---- 1 root disk 98, 20 Oct 1 08:23 /dev/ubdb4
Note that I specified "ubd0" on the command line when launching the UML.
However, I will need to refer to this device inside the UML as '/dev/ubda'
since I created the block device with the 'ubda' name. Also, should you
choose to create a partition table on the image (when building your own
filesystem), you may then need to use the '/dev/ubda[1-15]' devices.
Otherwise, you will need to refer to your file systems (inside the UML) with
the '/dev/ubd[a-h]' devices.
Good luck!
Tony
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of
Derek R. Meiresonne
Sent: Friday, October 07, 2005 11:38 AM
To: Brock, Anthony - NET
Cc: user-mode-linux-user@lists.sourceforge.net; [EMAIL PROTECTED]
Subject: Re: [uml-user] Over 16 UBD devices...
OK guys; I am trying to concat both of what you guys have said...
1) On Host: brw-r--r-- 1 root root 98, 1 Oct 7 12:52 /dev/ubd0p1
2) On UML: brw-r--r-- 1 root root 98, 1 Oct 7 12:52 /dev/ubd0p1
3) /root/uml/linux-2.6.12.3/linux root=98:1
98:1=/backup/Slackware-10.1.ext2-795 eth0=tuntap,,,207.230.28.10 mem=64M
umid=795
It dies with:
Failed to open 'root_fs', errno = 2
VFS: Cannot open root device "98:1" or unknown-block(98,1)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on
unknown-block(98,1)
<6>Stopping all CPUs...done
What am I doing wrong?
Derek R. Meiresonne
eTecc Communications, Inc.
www.eTecc.com
Brock, Anthony - NET wrote:
Okay, just noticed a BIG mistake. The "mknod -m 0660 /dev/ubd1p1 b 98 1"
should be "mknod -m 0660 /dev/ubd1p1 b 98 17". I hope this is vaguely
related to what you're asking...
Tony
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On
Behalf Of Brock, Anthony - NET
Sent: Friday, October 07, 2005 11:19 AM
To: user-mode-linux-user@lists.sourceforge.net
Subject: RE: [uml-user] Over 16 UBD devices...
Derek,
I haven't done this with the actual root filesystem. I have done this
with "data" filesystems. However, I would suspect something like the
following (typing from memory, so take with a grain of salt):
./linux ubd0s=/path/to/currentimage ubd1s=/path/to/partitioned/image
[other options] -s
[boot into single-user mode]
# fdisk /dev/ubd1
[create your partition table and save it]
# mount -o remount,rw /
# mknod -m 0660 /dev/ubd1p1 b 98 1
# mount /dev/ubd1p1 /mnt
# for dir in `ls |egrep -v 'lost+found|mnt'` do cp -a $dir /mnt/; done
# umount /mnt
# shutdown -h now
Then give it a try with something like:
./linux ubd0s=/path/to/partitioned/image [other options]
The key is creating an image with a partition table. This should also
eliminate the following warnings at boot:
ubda: unknown partition table
ubdb: unknown partition table
Let us know how it goes!
Tony
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On
Behalf Of Derek R. Meiresonne
Sent: Friday, October 07, 2005 11:05 AM
To: user-mode-linux-user@lists.sourceforge.net
Subject: [uml-user] Over 16 UBD devices...
How can I use over 16 UBD devices? I have read in the mailing
lists that
you can create partitions:
brw-r--r-- 1 root root 98, 1 Oct 7 12:52 /dev/ubd0p1
However; I cannot mount the above device while UML is booting. Can
someone provide me with some direction?
--
Derek R. Meiresonne
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