Re: [Xen-users] How was CoW implemented on the Demo LiveCD (3.0) ??

[Anand <xen.mails@xxxxxxxxx>]

On 1/27/06, Tim Deegan <Tim.Deegan@xxxxxxxxxxxx> wrote:

> device-mapper ioctl cmd 9 failed: Invalid argument
> Command failed

In that case I'm out of ideas.  You might try the device-manager mailing
lists.

I found something on the mailing lists

http://lists.xensource.com/archives/html/xen-users/2005-06/msg00440.html

This works for the flat files, however it doesn't work for the volumes. It gives the same error as i am getting with create_cow script for flat files.

The difference what i see by just glancing over it, 

create_cow script
+ dmsetup suspend cent01-master
+ echo '0 2050048 snapshot /dev/mapper/cent01-master /dev/loop1 p 50'
+ dmsetup create cent01

working lines from the above post
echo "0 $BLOCKSIZE snapshot /dev/mapper/rootfs_base /dev/loop1 p 8" \
    | dmsetup create rootfs1
A difference of 50 and 8. What does this stand for any ideas ?

Thanks for all the help.

-- 

regards,

Anand
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