From: Josh Durgin <josh.durgin@dreamhost.com>
To: Mandell Degerness <mandell@pistoncloud.com>
Cc: ceph-devel@vger.kernel.org
Subject: Re: Nova on RBD Device
Date: Tue, 07 Feb 2012 18:32:24 -0800 [thread overview]
Message-ID: <4F31DEB8.3070409@dreamhost.com> (raw)
In-Reply-To: <CA+jddaPFD5qVmUFVygW-HgWbCCvhM6A+_2BCann7NuZgmwgRJA@mail.gmail.com>
On 02/07/2012 11:01 AM, Mandell Degerness wrote:
> Can anyone point me in the right direction for setting up Nova so that
> it allocates disk space on RBD device(s) rather than on local disk as
> defined in the --instances_path flag?
You probably want to use the boot-from-volume api extension. I think
there's support in nova-client for this now.
> I've already got nova-volume working with RBD.
>
> I suspect that I need to modify _cache_image and _create_image in
> nova/virt/libvirt/connection.py.
Nova itself doesn't know how to do I/O to volumes - it just knows how to
configure a hypervisor to use one. You'll need to attach the volume to
an existing vm to write an image to it, or use a hack like:
rbd rm pool/image && qemu-img convert -f raw -O rbd /path/to/img
rbd:pool/image
In the future, once rbd layering is implemented, we'd like to be able to
store images in rbd via glance, and clone them into bootable nova volumes.
> Regards,
> Mandell Degerness
prev parent reply other threads:[~2012-02-08 2:32 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-07 19:01 Nova on RBD Device Mandell Degerness
2012-02-07 23:15 ` Florian Haas
2012-02-08 2:32 ` Josh Durgin [this message]
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