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By default, this will create a pool per rack, 3x replication, with a host failure domain. Those parameters can be customized via mgr config-key options. Signed-off-by: Sage Weil <sage@redhat.com>
35 lines
1.2 KiB
ReStructuredText
35 lines
1.2 KiB
ReStructuredText
Local pool plugin
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=================
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The *localpool* plugin can automatically create RADOS pools that are
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localized to a subset of the overall cluster. For example, by default, it will
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create a pool for each distinct rack in the cluster. This can be useful for some
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deployments that want to distribute some data locally as well as globally across the cluster .
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Enabling
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--------
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The *localpool* module is enabled with::
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ceph mgr module enable localpool
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Configuring
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-----------
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The *localpool* module understands the following options:
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* **subtree** (default: `rack`): which CRUSH subtree type the module
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should create a pool for.
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* **failure_domain** (default: `host`): what failure domain we should
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separate data replicas across.
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* **pg_num** (default: `128`): number of PGs to create for each pool
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* **num_rep** (default: `3`): number of replicas for each pool.
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(Currently, pools are always replicated.)
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* **prefix** (default: `by-$subtreetype-`): prefix for the pool name.
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These options are set via the config-key interface. For example, to
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change the replication level to 2x with only 64 PGs, ::
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ceph config-key set mgr/localpool/num_rep 2
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ceph config-key set mgr/localpool/pg_num 64
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