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xen-users
Re: [Xen-users] CoW works on Windows guest?
Finally, I've got the dscow_tool & cowd binary files. Yet, I have another question. Is there any limitation of the size of image that dscow_tool can create? Because I successfully created dscow image from 1GB image or smaller image but
2.1 GB. I've got the error "segmentation fault" for 2.1GB image.
Thank you.
On 9/28/06, Dan Smith <
danms@xxxxxxxxxx> wrote:OS> My current dom0 was compiled from xen-3.0.2-2 source + dm
OS> patches. I cannot find the cowd daemon. I wonder if it is
OS> something I need to compile separately.
If you applied the dm-userspace patches to your xen tree and either
rebuilt and installed the whole tree, or at least the tools part, you
should have "dscow_tool" and "cowd" binaries on your system. If you
don't see them, check in the tools/ directory of your tree
OS> Which device do you mean for the target device? Previously, my
OS> installation configuration file was like disk = ["file:/xenimages/
OS> windowsbase.img,ioemu:hda,w" ]. Then, I changed to disk =
OS> ["dmu:dscow:/tmp/
OS> windowsbase.dscow:/xenimages/windowsbase.img
,ioemu:hda,w" ]. Is
OS> the /tmp/ windowsbase.dscow what you meant?
Do this:
# dscow_tool -c /xenimages/windowsbase.dscow /xenimages/windowsbase.img
Which will create the cow file. Then do:
# cowd -p --sync=a dscow windowsbase /xenimages/windowsbase.dscow
Which will create a /dev/mapper/windowsbase device. Any writes to
this device will be stored in the .dscow file; the .img file will
remain untouched. Then, configure your domain to use the new device
with something like this:
disk = [ '/dev/mapper/windowsbase,ioemu:hda,w' ]
(I'm not all that familiar with HVM config files, so adjust the above
line as appropriate)
Note that all the above assumes you have the dm-user.ko module
loaded. If you built and installed Xen with the dm-userspace patches,
you should be able to just do:
# modprobe dm-user
--
Dan Smith
IBM Linux Technology Center
Open Hypervisor Team
email: danms@xxxxxxxxxx
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