Provide guidance on managing Ceilometer data store.

[Stephen Gordon]

After running an "all in one" setup for ~ 10 days with minimal activity I found that /var/lib/mongodb/journal contained around 3 G of data.

Need to confirm that this is within expectations and provide guidance to administrators on managing the size of their Ceilometer data store - advice from the Ceilometer team is required on this point.

[Stephen Gordon (sgordon)]

Default journalling settings for Ceilometer will allocate around 3 G. Enabling the small-files option can be used to bring this down, but may not be recommended for production environments?

See also:

https://ask.openstack.org/en/question/7358/how-to-safely-clear-ceilometer-database/
http://docs.mongodb.org/manual/tutorial/manage-journaling/
http://docs.mongodb.org/manual/reference/configuration-options/#smallfiles

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/67676

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/67676
Committed: https://git.openstack.org/cgit/openstack/openstack-manuals/commit/?id=3f6acb07c292cdfeea31f02872d35ee8b65fc8c8
Submitter: Jenkins
Branch: master

commit 3f6acb07c292cdfeea31f02872d35ee8b65fc8c8
Author: Stephen Gordon <email address hidden>
Date: Sat Jan 18 14:17:33 2014 -0500

    Add a note highlighting MongoDB disk requirements

    Added a note to highlight the disk requirements of MongoDB
    when database journaling is enabled (default). Provided
    instructions for switching to smaller files and a link
    to instructions for disabling journaling entirely.

    Change-Id: Ie7410018ce664cddd66309df8d1b1bb17abdfcbb
    Closes-Bug: #1253214

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/openstack-manuals 15.0.0 release.