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What happens when StorageGRID becomes full?

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Applies to

StorageGRID

Answer

  • If the grid's object data storage is at or near 100% used, StorageGRID will reject PUT requests until enough nodes come back to a writable state. 
  • It is important to have enough writable nodes at the site of ingest to satisfy ILM rules.  
    • If we do not have enough nodes to satisfy ILM rules, then grid could either:
      • Default to dual commit ingest behavior (2 copy) if there are 2 writable nodes at site of ingest, which results in quicker consumption of object space
        OR
      • Fail the write if there are less than 2 writable nodes at site of ingest OR ILM rule has strict ingest behavior that cannot be satisfied
        • Unless there is a 1-copy ILM rule
  • Impact is typically seen before the grid becomes 100% full because we have threshold values set to put nodes in read-only mode which is known as watermarks.

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