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Diffstat (limited to 'src/ceph/doc/mgr/localpool.rst')
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diff --git a/src/ceph/doc/mgr/localpool.rst b/src/ceph/doc/mgr/localpool.rst new file mode 100644 index 0000000..5779b7c --- /dev/null +++ b/src/ceph/doc/mgr/localpool.rst @@ -0,0 +1,35 @@ +Local pool plugin +================= + +The *localpool* plugin 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-key set mgr/localpool/num_rep 2 + ceph config-key set mgr/localpool/pg_num 64 |