[Sheepdog] Openstack: is sheepdog support limited to volumes?

[MORITA Kazutaka]

At Sat, 9 Jul 2011 00:44:29 +0200,
Giuseppe Civitella wrote:
> 
> Once I've read Morita Kazutaka's answer to my mail I've found the same 
> blueprint. 
> I realized that when Diablo will be released something very interesting will 
> happen in terms of distributed storage support.
> 
> May I ask for a comparison between Sheepdog, Ceph and Glusterfs ?

Ceph and GlusterFS are file systems, but Sheepdog provides only block
devices to virtual machines.  RBD, which is a part of Ceph, provides
block devices like Sheepdog, but there are some differences between two:
 - RBD can be accessed as a Linux block device
 - RBD seems to scale more than Sheepdog
 - Sheepdog has a fully symmetric architecture
 - Sheepdog supports dynamic membership management (zero configuration
   about the node membership)

You can use Sheepdog and RBD from OpenStack, but GlusterFS is not
supported yet.

Thanks,

Kazutaka

> 
> Thanks a lot
> Giuseppe
> 
> 
> 
> On Friday 08 July 2011 16:34:07 Dan Mihai Dumitriu wrote:
> > That is a limitation of Nova, not Sheepdog.  The boot from volume
> > support is the same for all types of block storage.
> > 
> > The work to make booting from volumes work is ongoing, please see
> > https://blueprints.launchpad.net/nova/+spec/boot-from-volume
> > 
> > Cheers,
> > Dan
> > 
> > 
> > On Wed, Jul 6, 2011 at 03:34, MORITA Kazutaka
> > 
> > <morita.kazutaka at lab.ntt.co.jp> wrote:
> > > At Mon, 4 Jul 2011 18:38:16 +0200,
> > > 
> > > Giuseppe Civitella wrote:
> > >> Hi all,
> > >> 
> > >> IFAIK libvirt and qemu both support the creation of virtual machines
> > >> which have boot disk stored on a sheepdog cluster.
> > >> I've beek checking openstack's wiki for sheepdog's related information.
> > >> I've found a configuration example:
> > >> http://docs.openstack.org/cactus/openstack-compute/admin/content/sample-
> > >> nova-configuration-files.html and this blueprint page:
> > >> http://wiki.openstack.org/SheepdogSupport
> > >> 
> > >> Both pages are just about volumes management.
> > >> It seems it's not possible to boot a vm on a nova-compute node while
> > >> storing it's disk on a sheepdog cluster: am I wrong?
> > > 
> > > Currently, OpenStack virtual machines cannot boot from Sheepdog
> > > volumes.  The work is still on going, and will be supported in the
> > > next release, Diablo.  What you can do with the current version is
> > > attaching/detaching Sheepdog volumes to the OpenStack virtual
> > > machines.
> > > 
> > > Thanks,
> > > 
> > > Kazutaka
> > > --
> > > sheepdog mailing list
> > > sheepdog at lists.wpkg.org
> > > http://lists.wpkg.org/mailman/listinfo/sheepdog
> -- 
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