On Tue, Aug 20, 2013 at 04:43:48PM +0200, Stefan Hajnoczi wrote: > 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?
FYI this was solved in libvir-list. The image file was on tmpfs, which does not support cache=none. We hit this so often it would be a huge help if QEMU reported a clearer error message then "Invalid Argument" when trying cache=none on tmpfs. Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|
