[libvirt-users] RBD images locking
Hi, One short question : Is there any chance to see locks on rbd/images in the next release ? Thank you :)
On 11/07/2013 07:56 AM, NEVEU Stephane wrote:
Hi,
One short question : Is there any chance to see locks on rbd/images in the next release ?
What exactly are you looking for? Are you willing to contribute the patches? -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
Eric, Well, in case where several servers may start the same virtual machines after a reboot for exemple. http://lists.ceph.com/pipermail/ceph-users-ceph.com/2013-August/003887.html I've seen this hook here : http://www.wogri.at/en/linux/ceph-libvirt-locking/ But it's a hook... Yes, I may try to write a patch. My coding skills are surely not as good as yours but I 'd be glad to make a try :) -----Message d'origine----- De : Eric Blake [mailto:eblake@redhat.com] Envoyé : jeudi 7 novembre 2013 16:40 À : NEVEU Stephane; libvirt-users@redhat.com Objet : Re: [libvirt-users] RBD images locking On 11/07/2013 07:56 AM, NEVEU Stephane wrote:
Hi,
One short question : Is there any chance to see locks on rbd/images in the next release ?
What exactly are you looking for? Are you willing to contribute the patches? -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
On 11/07/2013 09:04 AM, NEVEU Stephane wrote:
Eric,
[please don't top-post on technical lists]
Well, in case where several servers may start the same virtual machines after a reboot for exemple. http://lists.ceph.com/pipermail/ceph-users-ceph.com/2013-August/003887.html
Isn't the existing virtlockd support already sufficient for this? If not, what is preventing the virtlock framework from interacting with rbd disks? http://libvirt.org/locking.html -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
De : Eric Blake [mailto:eblake@redhat.com] Envoyé : jeudi 7 novembre 2013 17:09 À : NEVEU Stephane; libvirt-users@redhat.com Objet : Re: [libvirt-users] RBD images locking On 11/07/2013 09:04 AM, NEVEU Stephane wrote:
Eric,
[please don't top-post on technical lists] Sorry !
Well, in case where several servers may start the same virtual machines after a reboot for exemple. http://lists.ceph.com/pipermail/ceph-users-ceph.com/2013-August/003887 .html
Isn't the existing virtlockd support already sufficient for this? If not, what is preventing the virtlock framework from interacting with rbd disks? Ok, I'll take a look. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
On Thu, Nov 07, 2013 at 09:08:58AM -0700, Eric Blake wrote:
On 11/07/2013 09:04 AM, NEVEU Stephane wrote:
Eric,
[please don't top-post on technical lists]
Well, in case where several servers may start the same virtual machines after a reboot for exemple. http://lists.ceph.com/pipermail/ceph-users-ceph.com/2013-August/003887.html
Isn't the existing virtlockd support already sufficient for this? If not, what is preventing the virtlock framework from interacting with rbd disks?
Nothing really. The current impl only deals with disks with type=file or type=block, ignoring type=network. We could extend it to cope with the latter though - either using a URI to uniquely identify the network storage, or better yet using some unique volume ID if available. 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 :|
De : Daniel P. Berrange [mailto:berrange@redhat.com] Envoyé : vendredi 8 novembre 2013 06:32 À : Eric Blake Cc : NEVEU Stephane; libvirt-users@redhat.com Objet : Re: [libvirt-users] RBD images locking On Thu, Nov 07, 2013 at 09:08:58AM -0700, Eric Blake wrote:
On 11/07/2013 09:04 AM, NEVEU Stephane wrote:
Eric,
[please don't top-post on technical lists]
Well, in case where several servers may start the same virtual machines after a reboot for exemple. http://lists.ceph.com/pipermail/ceph-users-ceph.com/2013-August/0038 87.html
Isn't the existing virtlockd support already sufficient for this? If not, what is preventing the virtlock framework from interacting with rbd disks?
Nothing really. The current impl only deals with disks with type=file or type=block, ignoring type=network. We could extend it to cope with the latter though - either using a URI to uniquely identify the >network storage, or better yet using some unique volume ID if available.
Yes it might be useful when not using an orchestrator. Can't we use the "block_name_prefix" of a volume to do so ? It seems to be unique and to be the entry point to identify an image (via objects) across a pool : rbd -p mypool info myvm rbd image 'myvm' Size 10240 MB in 2560 objects Order 22 (4096 kB objects) block_name_prefix: rb.0.11a6.238e1f29 format: 1 rados -p mypool ls | grep ^rb.0.11a6.238e1f29 | wc -l 630 objects
Hello, On Thu, Nov 7, 2013 at 8:04 PM, NEVEU Stephane <stephane.neveu@thalesgroup.com> wrote:
Eric,
Well, in case where several servers may start the same virtual machines after a reboot for exemple. http://lists.ceph.com/pipermail/ceph-users-ceph.com/2013-August/003887.html
I've seen this hook here : http://www.wogri.at/en/linux/ceph-libvirt-locking/ But it's a hook... Yes, I may try to write a patch. My coding skills are surely not as good as yours but I 'd be glad to make a try :)
That`s an orchestrator issue and should be fixed using orchestrator capabilities IMO.
-----Message d'origine----- De : Eric Blake [mailto:eblake@redhat.com] Envoyé : jeudi 7 novembre 2013 16:40 À : NEVEU Stephane; libvirt-users@redhat.com Objet : Re: [libvirt-users] RBD images locking
On 11/07/2013 07:56 AM, NEVEU Stephane wrote:
Hi,
One short question : Is there any chance to see locks on rbd/images in the next release ?
What exactly are you looking for? Are you willing to contribute the patches?
-- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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participants (4)
-
Andrey Korolyov -
Daniel P. Berrange -
Eric Blake -
NEVEU Stephane