You can track ILM evaluation attributes to determine the recovery point objective (RPO) of the StorageGRID Webscale system as defined by the ILM policy. The RPO defines the maximum tolerable period in which data might be lost because of a site failure, a Storage Node failure, or both.
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About this task
The StorageGRID Webscale system manages objects by applying the defined ILM policy. The ILM policy and associated ILM rules determine how many copies are made, how those copies are made, the appropriate placement, and the length of time each copy is retained.
- Repair of replicated copies with only one copy remaining.
- Awaiting - Background: excludes repair of replicated copies with only one copy remaining.
- Awaiting - Client: includes new ingests and metadata updates; excludes deletions.
- Deletions.
Ingest or other activity can exceed the rate at which the system can process ILM. When this scenario occurs, the system will begin to queue objects whose ILM can no longer be fulfilled in near real time. In the example shown, the chart of the Awaiting—Client indicates that the number of objects awaiting ILM evaluation temporarily increases in an unsustainable manner, then eventually decreases. Such a trend indicates that ILM was temporarily not fulfilled in near real time.
