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https://github.com/ceph/ceph
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62 lines
1.7 KiB
ReStructuredText
62 lines
1.7 KiB
ReStructuredText
OSD Support Module
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==================
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The OSD Support module holds osd specific functionality that
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is needed by different components like the orchestrators.
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In current scope:
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* osd draining
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Enabling
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--------
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When an orchestrator is used this should be enabled as a dependency.
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(*currently only valid for the cephadm orchestrator*)
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The *osd_support* module is manually enabled with::
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ceph mgr module enable osd_support
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Commands
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--------
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Draining
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########
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This mode is for draining OSDs gracefully. `Draining` in this context means gracefully emptying out OSDs by setting their
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weight to zero. An OSD is considered to be drained when no PGs are left.
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::
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ceph osd drain $osd_id
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Takes a $osd_id and schedules it for draining. Since that process can take
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quite some time, the operation will be executed in the background. To query the status
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of the operation you can use:
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::
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ceph osd drain status
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This gives you the status of all running operations in this format::
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[{'osd_id': 0, 'pgs': 1234}, ..]
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If you wish to stop an OSD from being drained::
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ceph osd drain stop [$osd_id]
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Stops all **scheduled** osd drain operations (not the operations that have been started already)
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if no $osd_ids are given. If $osd_ids are present it only operates on them.
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To stop and reset the weight of already started operations we need to save the initial weight
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(see 'Ideas for improvement')
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Ideas for improvement
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----------------------
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- add health checks set_health_checks
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- use objects to represent OSDs
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- allows timestamps, trending information etc
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- save osd drain state (at least the osd_ids in the mon store)
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- resume after a mgr crash
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- save the initial weight of a osd i.e. (set to initial weight on abort)
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