mirror of https://github.com/ceph/ceph
36 lines
1.3 KiB
ReStructuredText
36 lines
1.3 KiB
ReStructuredText
Local Pool Module
|
|
=================
|
|
|
|
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 some
|
|
deployments that want to distribute some data locally as well as globally across the cluster .
|
|
|
|
Enabling
|
|
--------
|
|
|
|
The *localpool* module is enabled with::
|
|
|
|
ceph mgr module enable localpool
|
|
|
|
Configuring
|
|
-----------
|
|
|
|
The *localpool* module understands the following options:
|
|
|
|
* **subtree** (default: `rack`): which CRUSH subtree type the module
|
|
should create a pool for.
|
|
* **failure_domain** (default: `host`): what failure domain we should
|
|
separate data replicas across.
|
|
* **pg_num** (default: `128`): number of PGs to create for each pool
|
|
* **num_rep** (default: `3`): number of replicas for each pool.
|
|
(Currently, pools are always replicated.)
|
|
* **min_size** (default: none): value to set min_size to (unchanged from Ceph's default if this option is not set)
|
|
* **prefix** (default: `by-$subtreetype-`): prefix for the pool name.
|
|
|
|
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
|