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charm-nova-compute
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Add blurb about Ceph BlueStore compression 

Change-Id: Ide04a2aab6ac55b114eb27a256c523e57bb9558a
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Frode Nordahl 2020-10-19 11:02:27 +02:00
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README.md
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@ -84,6 +84,19 @@ Erasure coded pools can be configured via options whose names begin with the
See [Ceph Erasure Coding][cdg-ceph-erasure-coding] in the [OpenStack Charms
Deployment Guide][cdg] for more information.
## Ceph BlueStore compression
This charm supports [BlueStore inline compression][ceph-bluestore-compression]
for its associated Ceph storage pool(s). The feature is enabled by assigning a
compression mode via the `bluestore-compression-mode` configuration option. The
default behaviour is to disable compression.
The efficiency of compression depends heavily on what type of data is stored
in the pool and the charm provides a set of configuration options to fine tune
the compression behaviour.
> **Note**: BlueStore compression is supported starting with Ceph Mimic.
## Database
Nova compute only requires database access if using nova-network. If using
@ -283,3 +296,4 @@ For general charm questions refer to the OpenStack [Charm Guide][cg].
[cloud-archive-ceph]: https://wiki.ubuntu.com/OpenStack/CloudArchive#Ceph_and_the_UCA
[wiki-uca]: https://wiki.ubuntu.com/OpenStack/CloudArchive
[cdg-ceph-erasure-coding]: https://docs.openstack.org/project-deploy-guide/charm-deployment-guide/latest/app-erasure-coding.html
[ceph-bluestore-compression]: https://docs.ceph.com/en/latest/rados/configuration/bluestore-config-ref/#inline-compression