fuel-dev team mailing list archive

[Dmitry Borodaenko <dborodaenko@xxxxxxxxxxxx>]

On Dec 18, 2013 7:09 AM, "Mike Scherbakov" <mscherbakov@xxxxxxxxxxxx> wrote:
> Do I miss anything in the above?

No.

> Do we plan to have it documented anywhere so it is easy to understand for
the user, who might be not very well experienced with all cinder, lvm,
ephemeral, ceph, swift, rbd and other terms?

It is documented to some extent in settings descriptions and a bit more in
the Reference Architecture. Maybe it's worth adding more details to the
Storage Architecture section? Should there be a link to that section
somewhere in the UI?

> What does mean checkbox "Cinder LVM over iSCSI for volumes" - what are
the use cases for it?

It is the default Cinder option from your list. The primary use case is
where the cloud administrator doesn't need additional redundancy provided
by Ceph and needs to maximize data density for volumes.

> Do we need cinder role applied to any servers if we use Ceph everywhere?

No.

> Will RadosGW conflict with Swift in HA mode?

Yes. This is reflected in the RadosGW setting description.

> Did we create bugs about unneeded LVMs for Glance, /var/lib/nova if we
use Ceph? Or we still need LVMs?

Our discussionon this yesterday was a bit inconclusive. I'm in favor of
keeping the LVMs in 4.0 do as not to destabilize the release, and removing
them in 4.1. If there are no objections I will create bugs targeted for 4.1.

> Are there any other combinations which may lead to side effects? Can we
have all of them verified?

No, I don't think so.

> How many of the things above are covered by system tests, and how many
still need to be covered?
> Do we have multiple backend support in Cinder?

No. Andrew started this work but it was held back by the splinters bug.

> The whole UX with only checkboxes doesn't look like ideal solution to me.
What do you think folks, should we file a blueprint and implement better UX
for it in future versions?

TBH I would have a single checkbox in the wizard that would enable all Ceph
options. Not sure what we can do about the checkboxes in the settings tab
though.

-Dmitry