I am trying to detach an ISO from a KVM machine and I've tried both attach-disk using " " in the file path as well as the update-device option but am getting this error

error: Failed to update device from /var/run/libvirt/qemu/kvmtest1.xml

error: XML description for unknown device type is not well formed or invalid.

I tried doing a virsh edit on the xml file to remove the source file path to the ISO, as I assume is the correct method, and then running the virsh update-device but it's not working. 

Can anyone advise the correct steps to detach a device from a running and/or offline domain?

Additionally - anyone have any guidance on how to attach a CD device to a domain that is currently shutdown, for example, if I wanted to boot the domain to a rescue CD image?

Thanks

Jeff

于 2011年03月31日 15:17, Masanari Iida 写道:

Somebody sent me a tips.
Following command do what I wanted to do.
Thanks.

attach-disk guest01 " " hdc --driver file --type cdrom
--mode readonly

Also using "update-device" with an xml which doesn't specify
the source file path will work.

On Thu, Mar 31, 2011 at 3:29 PM, Masanari Iida<standby24x7 gmail com>  wrote:

Hello,

I can attach disc ISO image to cd-rom from virsh.
And I can replace the ISO image from disc1 to disc2 using the 2nd example.

(example)
attach-disk guest01 /root/disc1.iso hdc --driver file --type cdrom
--mode readonly
attach-disk guest01 /root/disc2.iso hdc --driver file --type cdrom
--mode readonly

My question is, how can I disconnect the image from the cdrom drive using virsh.
Because, if I try to detach-disk hdc, I got following errors.

virsh # detach-disk guest01 hdc
error: Failed to detach disk
error: this function is not supported by the connection driver:
This type of device cannot be hot unplugged

What I can do is possible from virt-manager's "Disconnect" button,
(next to source path: line)  from Hardware's TAB, Disk hdc screen.
I want to do this from virsh.

OS: RHEL5.6
libvirt-0.8.2-15.el5_6.1 is used.

Regards,
Masanari Iida

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