Object Recovery Basics
Explains object recovery modes.
HPE Ezmeral Data Fabric Object Store
features the ability to recover objects. Recovery operations include cleaning partially
written objects, purging non-current versions of unversioned objects, and cleaning incomplete
multi-part objects. Recovery also claims space by deleting dangling delete markers and objects
marked for purge. In addition, recovery aggregates bucket statistics.
NOTE
Recovery can run
only on the node where the master copy of OLT table's first tablet is hosted. Recovery must
be triggered using the alias of the node to which the bucket is assigned. Triggering
recovery using a wrong node alias leads to a failure.There are two recovery modes: mini and full.
- Mini recovery mode
- In a mini recovery, the system scans for buckets to recover every hour. The system picks up buckets that were created or modified in the last hour and examines them for any recovery to perform. The recovery deletes dangling delete markers.
- Full recovery mode
- In a full recovery, the system scans ALL buckets every week and examines them for any recovery to perform. Similar to the mini recovery, the system deletes all incomplete multipart uploads and dangling delete markers.
See mc admin recovery start and mc admin recovery stop to start and stop recovery.