Hi I am trying to use qcow2 disks. Environment is SLES 10 SP2 dom0 and tried Ubuntu and CentOS domUs. Initially used qemu-img to create disks .. but did not work. The installer did not recognize any disks. Then ran in to the following article that suggested to use qcow-create and the PV VM started. But is very... slow. It took more than 30 min to format 5G. And installation is going over 10 hrs. now.! For HVM vm, The partitioning dialog does not show any disks! The disk entry is as follows. disk=[''tap:qcow:/mnt/storage/vm_disks/hvm_qcow.qcow,xvda,w'', ''file:/mnt/storage/iso/CentOS-5.4-x86_64-bin-DVD.iso,hdc:cdrom,r''] Tried tap:qcow, file as protocol and xvda, hda as disks but nothing seem to work. Any ideas ? Is anyone using qcow2 format their daily use ? or in production ? I am trying to standardize on this so I can take snapshots. Any help is appreciated. -nb _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On Mon, Jan 4, 2010 at 8:58 AM, J Nb <j_nwb@yahoo.com> wrote:> Any ideas ? > Is anyone using qcow2 format their daily use ? or in production ?Short answer: most likely no. There were problems with Xen and qcow/qcow2, and so far I haven''t seen anyone reports their success on this list.> I am trying to standardize on this so I can take snapshots. > Any help is appreciated.It''s easier to use LVM. Be careful when using LVM snapshot though, make ABSOLUTELY sure you don''t run out of space on the snapshot. -- Fajar _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Thanks..> It''s easier to use LVM. Be careful when using LVM snapshot > though, > make ABSOLUTELY sure you don''t run out of space on the > snapshot. >You mean the snapshot volume should have enough size.. for heavily running VM ( i.e. when a large number of blocks are getting written.. while the snapshot is being copied.). Right ? -nb --- On Sun, 1/3/10, Fajar A. Nugraha <fajar@fajar.net> wrote:> From: Fajar A. Nugraha <fajar@fajar.net> > Subject: Re: [Xen-users] Xen and QCOW problems > To: "J Nb" <j_nwb@yahoo.com> > Cc: "xen-users" <xen-users@lists.xensource.com> > Date: Sunday, January 3, 2010, 6:09 PM > On Mon, Jan 4, 2010 at 8:58 AM, J Nb > <j_nwb@yahoo.com> > wrote: > > Any ideas ? > > Is anyone using qcow2 format their daily use ? or in > production ? > > Short answer: most likely no. > There were problems with Xen and qcow/qcow2, and so far I > haven''t seen > anyone reports their success on this list. > > > I am trying to standardize on this so I can take > snapshots. > > Any help is appreciated. > > It''s easier to use LVM. Be careful when using LVM snapshot > though, > make ABSOLUTELY sure you don''t run out of space on the > snapshot. > > -- > Fajar > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On Mon, Jan 4, 2010 at 9:28 AM, J Nb <j_nwb@yahoo.com> wrote:>> It''s easier to use LVM. Be careful when using LVM snapshot >> though, >> make ABSOLUTELY sure you don''t run out of space on the >> snapshot. >> > > You mean the snapshot volume should have enough size.. for heavily running VM ( i.e. when a large number of blocks are getting written.. while the snapshot is being copied.). Right ?Yes. Last time I play around with LVM snapshot, one of the snapshot got 100% full, and I ended up losing data :P Good thing this was on dev server. Nowadays I use LVM snapshot only for backup purposes, and delete them afterwards. -- Fajar _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On Sun, Jan 3, 2010 at 5:58 PM, J Nb <j_nwb@yahoo.com> wrote:> Hi > I am trying to use qcow2 disks. Environment is SLES 10 SP2 dom0 and tried > Ubuntu and CentOS domUs. > > Initially used qemu-img to create disks .. but did not work. The installer > did not recognize any disks. > > Then ran in to the following article that suggested to use qcow-create and > the PV VM started. But is very... slow. It took more than 30 min to format > 5G. And installation is going over 10 hrs. now.! > > For HVM vm, The partitioning dialog does not show any disks! The disk entry > is as follows. > > > disk=[''tap:qcow:/mnt/storage/vm_disks/hvm_qcow.qcow,xvda,w'', > ''file:/mnt/storage/iso/CentOS-5.4-x86_64-bin-DVD.iso,hdc:cdrom,r''] > > > Tried tap:qcow, file as protocol and xvda, hda as disks but nothing seem to > work. > > Any ideas ? > Is anyone using qcow2 format their daily use ? or in production ? > I am trying to standardize on this so I can take snapshots. > Any help is appreciated. > > -nb > > >No matter what the documentation says Qcow/Qcow2 doesn''t really work in Xen. Even if you manage to get it to boot of an image there''s no backing store support so why use it? I wish they''d either fix it or remove any reference to tap:qcow so some of us don''t waste weeks googleing and testing to try to get it functional. Grant McWilliams Some people, when confronted with a problem, think "I know, I''ll use Windows." Now they have two problems. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users