[Gluster-users] Failed on booting qcow2 image files on glusterfs

[Aaron Roberts]

> -----Original Message-----
> From: gluster-users-bounces at gluster.org [mailto:gluster-users-
> bounces at gluster.org] On Behalf Of Christoph Raible
> Sent: 11 May 2011 09:08
> To: gluster-users at gluster.org
> Subject: Re: [Gluster-users] Failed on booting qcow2 image files on glusterfs
> 
> Hi ,
> 
> I have the same issue. Is there any solution?
> 
> I have Scientific Linux 6 with glusterfs 3.2.0  and can't install a
> virtual Machine into a qcow2-Image file created on the gluster filesystem.
> 
> 
> Regards
> 
> Christoph
> 
> 

This is probably because your FUSE module is not allowing O_DIRECT system call to open the disk image file on the FUSE mounted filesystem.  What we did (and please someone let me know if it was the wrong thing to do!) was to download the FUSE module source from gluster.org and compile/install that.

I'm guessing you're using qemu-kvm?  If so, qemu-kvm will use O_SYNC (cache=writethough) to open a raw disk image and O_DIRECT (cache=none) to open a .qcow2 image. 

Aaron