[openstack-dev] [nova] Request Spec Freeze Exception (DRBD for Nova)
duncan.thomas at gmail.com
Fri Jan 30 09:54:33 UTC 2015
Very excited to see this in and usable
On Jan 30, 2015 2:56 AM, "Philipp Marek" <philipp.marek at linbit.com> wrote:
> Hi all,
> > in Paris (and later on, on IRC and the mailing list) I began to ask
> > about providing a DRBD storage driver for Nova.
> > This is an alternative to using iSCSI for block storage access, and would
> > be especially helpful for backends already using DRBD for replicated
> > storage.
> any news about this?
> To reiterate:
> * Spec was submitted in time (Nov 13)
> * Spec wasn't approved, because the Cinder implementation
> (https://review.openstack.org/#/c/140451/) merge got delayed,
> because its prerequisite (https://review.openstack.org/#/c/135139/,
> Transition LVM Driver to use Target Objects) wasn't merged in time,
> because on "deadline day" (Dec. 17) Gerrit was so much used that
> this devstack run got timeouts against some python site during
> * "Spec Freeze Exception" was submitted in time
> * Having DRBD for Cinder is good, but using the *same* protocol
> to the Nova nodes should really help performance (and reliability);
> for example, the transitions
> Network -> Kernel -> iSCSI daemon -> Kernel -> Block Device
> wouldn't be needed anymore; the Kernel could directly respond to the
> queries, and in the near future even using RDMA (where available).
> Reliability should be improved as the Nova node can access multiple
> storage nodes _at the same time_, so it wouldn't matter if one of them
> crashes for whatever reason.
> Please help us *now* to get the change in. It's only a few lines in
> a separate driver, so until it gets configured it won't even be
> And yes, of course we're planning to do CI for that Nova driver, too.
> : Ing. Philipp Marek
> : LINBIT | Your Way to High Availability
> : DRBD/HA support and consulting http://www.linbit.com :
> DRBD® and LINBIT® are registered trademarks of LINBIT, Austria.
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