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Local Pool Module
=================
.. mgr_module:: localpool
The *localpool* module can automatically create RADOS pools that are
localized to a subset of the overall cluster. For example, by default, it will
create a pool for each distinct ``rack`` in the cluster. This can be useful for
deployments where it is desirable to distribute some data locally and other data
globally across the cluster. One use-case is measuring performance and testing
behavior of specific drive, NIC, or chassis models in isolation.
Enabling
--------
The *localpool* module is enabled with::
ceph mgr module enable localpool
Configuring
-----------
The *localpool* module understands the following options:
.. confval:: subtree
.. confval:: failure_domain
.. confval:: pg_num
.. confval:: num_rep
.. confval:: min_size
.. confval:: prefix
:default: by-$subtreetype-
These options are set via the config-key interface. For example, to
change the replication level to 2x with only 64 PGs, ::
ceph config set mgr mgr/localpool/num_rep 2
ceph config set mgr mgr/localpool/pg_num 64
.. mgr_module:: None
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