Capacity planning and scaling in Operations Guide - cells information is out of date

[Matt Riedemann]

- [x] This doc is inaccurate in this way:

The cells-related contents of this page are referring to the deprecated cells v1 model, which used the nova-cells service. As can be seen here:

https://docs.openstack.org/nova/latest/user/cells.html

Cells v1 is deprecated and cells v2 is required since Ocata, doesn't require the nova-cells service, API routing/synchronization, two-level scheduling, etc.

So starting in Ocata, all nova deployments are at least a cell of one, and then they can become multi-cell by simply adding on more cells (new sets of compute hosts with a DB/MQ for the cell). With cells v2 there is no tree structure, it's all flat and the nova controller services (API, conductor, scheduler) are cells-aware.

As a quick fix, it would probably be easiest to simply describe cells v2 at a high level and then link to the more detail nova docs on cells v2:

https://docs.openstack.org/nova/latest/user/cells.html

https://docs.openstack.org/nova/latest/user/cellsv2-layout.html

-----------------------------------
Release: on 2018-11-16 05:52
SHA: da505828793ae12622f5845e930fae9b82fcd6f0
Source: https://git.openstack.org/cgit/openstack/operations-guide/tree/doc/source/ops-capacity-planning-scaling.rst
URL: https://docs.openstack.org/operations-guide/ops-capacity-planning-scaling.html

[Matt Riedemann (mriedem)]

Umm, was there a change posted for this? I'm not sure why it was marked as Fix Committed.

[Frank Kloeker (f-kloeker)]

mhmm, the trigger from Gerrit was missing: https://review.opendev.org/#/c/660372/
Maybe it's caused by the fact, that Ops Guide uses Storyboard meanwhile instead Launchpad.

I pointed a link to the Nova doc for Cells in the patch.