Open Stack

So the way I see it, the value here is a generic driver that can work with
any storage.  The downsides:
1. The admin has to manually provision a very big volume and attach it to
the Nova and Cinder hosts.  Every time a host is rebooted, or introduced,
the admin must do manual work. This is one of the things OpenStack should
be trying to avoid. This can't be automated without a driver, which is what
you're trying to avoid.
2. You lose on performance to volumes by adding another layer in the stack.
3. You lose performance with snapshots - appliances will almost certainly
have more efficient snapshots than LVM over network (consider that for
every COW operation, you are reading synchronously over the network).

(Basically, you turned your fully-capable storage appliance into a dumb
JBOD)

In short, I think the cons outweigh the pros.  Are there people deploying
OpenStack who would deploy their storage like this?

Thanks,
Avishay

On Tue, May 20, 2014 at 6:31 PM, Mitsuhiro Tanino
<mitsuhiro.tanino at hds.com>wrote:

>  Hello All,
>
>
>
> I’m proposing a feature of LVM driver to support LVM on a shared LU.
>
> The proposed LVM volume driver provides these benefits.
>   - Reduce hardware based storage workload by offloading the workload to
> software based volume operation.
>   - Provide quicker volume creation and snapshot creation without storage
> workloads.
>   - Enable cinder to any kinds of shared storage volumes without specific
> cinder storage driver.
>
>   - Better I/O performance using direct volume access via Fibre channel.
>
>
>
> In the attachment pdf, following contents are explained.
>
>   1. Detail of Proposed LVM volume driver
>
>   1-1. Big Picture
>
>   1-2. Administrator preparation
>
>   1-3. Work flow of volume creation and attachment
>
>   2. Target of Proposed LVM volume driver
>
>   3. Comparison of Proposed LVM volume driver
>
>
>
> Could you review the attachment?
>
> Any comments, questions, additional ideas would be appreciated.
>
>
>
>
>
> Also there are blueprints, wiki and patches related to the slide.
>
> https://blueprints.launchpad.net/cinder/+spec/lvm-driver-for-shared-storage
>
> https://blueprints.launchpad.net/nova/+spec/lvm-driver-for-shared-storage
>
>
> https://wiki.openstack.org/wiki/Cinder/NewLVMbasedDriverForSharedStorageInCinder
>
> https://review.openstack.org/#/c/92479/
>
> https://review.openstack.org/#/c/92443/
>
>
>
> Regards,
>
> Mitsuhiro Tanino <mitsuhiro.tanino at hds.com>
>
>      *HITACHI DATA SYSTEMS*
>
>      c/o Red Hat, 314 Littleton Road, Westford, MA 01886
>
> _______________________________________________
> OpenStack-dev mailing list
> OpenStack-dev at lists.openstack.org
> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstack.org/pipermail/openstack-dev/attachments/20140521/2c781643/attachment.html>