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https://github.com/ceph/ceph
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67 lines
2.2 KiB
ReStructuredText
67 lines
2.2 KiB
ReStructuredText
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Placement Group States
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========================
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When checking a cluster's status (e.g., running ``ceph -w`` or ``ceph -s``),
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Ceph will report on the status of the placement groups. A placement group has
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one or more states. The optimum state for placement groups in the placement group
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map is ``active + clean``.
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*Creating*
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Ceph is still creating the placement group.
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*Active*
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Ceph will process requests to the placement group.
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*Clean*
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Ceph replicated all objects in the placement group the correct number of times.
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*Down*
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A replica with necessary data is down, so the placement group is offline.
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*Replay*
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The placement group is waiting for clients to replay operations after an OSD crashed.
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*Splitting*
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Ceph is splitting the placment group into multiple placement groups. (functional?)
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*Scrubbing*
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Ceph is checking the placement group for inconsistencies.
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*Degraded*
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Ceph has not replicated some objects in the placement group the correct number of times yet.
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*Inconsistent*
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Ceph detects inconsistencies in the one or more replicas of an object in the placement group
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(e.g. objects are the wrong size, objects are missing from one replica *after* recovery finished, etc.).
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*Peering*
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The placement group is undergoing the peering process
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*Repair*
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Ceph is checking the placement group and repairing any inconsistencies it finds (if possible).
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*Recovering*
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Ceph is migrating/synchronizing objects and their replicas.
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*Backfill*
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Ceph is scanning and synchronizing the entire contents of a placement group
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instead of inferring what contents need to be synchronized from the logs of
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recent operations. *Backfill* is a special case of recovery.
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*Wait-backfill*
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The placement group is waiting in line to start backfill.
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*Incomplete*
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Ceph detects that a placement group is missing a necessary period of history
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from its log. If you see this state, report a bug, and try to start any
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failed OSDs that may contain the needed information.
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*Stale*
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The placement group is in an unknown state - the monitors have not received
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an update for it since the placement group mapping changed.
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*Remapped*
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The placement group is temporarily mapped to a different set of OSDs from what
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CRUSH specified.
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