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Date: Tue, 20 Aug 2013 16:43:48 +0200
From: Stefan Hajnoczi <stefanha@gmail.com>
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Subject: Re: [Qemu-devel] Fwd: [libvirt] virDomainAttachDevice error during
 disk hotplug
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To: Deepak C Shetty <deepakcs@linux.vnet.ibm.com>
Cc: qemu-devel@nongnu.org

On Fri, Aug 16, 2013 at 06:52:32PM +0530, Deepak C Shetty wrote:
> 2) qemu-img info /var/run/vdsm/3333017d-1278-4bfb-8129-62bded257399
> image: /var/run/vdsm/3333017d-1278-4bfb-8129-62bded257399
> file format: qcow2
> virtual size: 3.8G (4096000000 bytes)
> disk size: 196K
> cluster_size: 65536
> backing file:
> /rhev/data-center/000065de-04b8-42e2-986c-2de664708be7/11112d24-4cda-4200-8f6d-a1d8362c70fd/images/22224c45-6504-4ea1-bd24-12340017dd32/3333017d-1278-4bfb-8129-62bded257399
> backing file format: qcow2

Good, QEMU can parse and read the file.

> 3) ls -l
> /rhev/data-center/000065de-04b8-42e2-986c-2de664708be7/11112d24-4cda-4200-8f6d-a1d8362c70fd/images/22224c45-6504-4ea1-bd24-12340017dd32/3333017d-1278-4bfb-8129-62bded257399
> -r--r-----. 1 vdsm kvm 197120 Aug 10 11:59
> /rhev/data-center/000065de-04b8-42e2-986c-2de664708be7/11112d24-4cda-4200-8f6d-a1d8362c70fd/images/22224c45-6504-4ea1-bd24-12340017dd32/3333017d-1278-4bfb-8129-62bded257399

Read-only?

> 4) libvirtd.log snippets:
> 
> 2013-08-10 11:19:41.766+0000: 1103: debug : virDomainAttachDevice:9820 :
> dom=0x7f92f4003f20, (VM: name=dpk_BR_vm,
> uuid=9999017d-1278-4bfb-8129-62bded257399), xml=<disk device="disk"
> snapshot="no" type="file">
>         <source file="/var/run/vdsm/3333017d-1278-4bfb-8129-62bded257399"/>
>         <target bus="virtio" dev="vdb"/>
> <serial>22224c45-6504-4ea1-bd24-12340017dd32</serial>
>         <driver cache="none" error_policy="stop" io="threads"
> name="qemu" type="qcow2"/>
> </disk>

I see no read-only option.

Does it work if you make the file read-write instead?