projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 3efd9988 FG |
1 | Local pool plugin |
| 2 | ================= | |
| 3 | ||
| 4 | The *localpool* plugin can automatically create RADOS pools that are | |
| 5 | localized to a subset of the overall cluster. For example, by default, it will | |
| 6 | create a pool for each distinct rack in the cluster. This can be useful for some | |
| 7 | deployments that want to distribute some data locally as well as globally across the cluster . | |
| 8 | ||
| 9 | Enabling | |
| 10 | -------- | |
| 11 | ||
| 12 | The *localpool* module is enabled with:: | |
| 13 | ||
| 14 | ceph mgr module enable localpool | |
| 15 | ||
| 16 | Configuring | |
| 17 | ----------- | |
| 18 | ||
| 19 | The *localpool* module understands the following options: | |
| 20 | ||
| 21 | * **subtree** (default: `rack`): which CRUSH subtree type the module | |
| 22 | should create a pool for. | |
| 23 | * **failure_domain** (default: `host`): what failure domain we should | |
| 24 | separate data replicas across. | |
| 25 | * **pg_num** (default: `128`): number of PGs to create for each pool | |
| 26 | * **num_rep** (default: `3`): number of replicas for each pool. | |
| 27 | (Currently, pools are always replicated.) | |
| 28 | * **min_size** (default: none): value to set min_size to (unchanged from Ceph's default if this option is not set) | |
| 29 | * **prefix** (default: `by-$subtreetype-`): prefix for the pool name. | |
| 30 | ||
| 31 | These options are set via the config-key interface. For example, to | |
| 32 | change the replication level to 2x with only 64 PGs, :: | |
| 33 | ||
| 34 | ceph config-key set mgr/localpool/num_rep 2 | |
| 35 | ceph config-key set mgr/localpool/pg_num 64 |