Monitoring object verification operations

The StorageGRID system can verify the integrity of object data on Storage Nodes, checking for both corrupt and missing objects.

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About this task

There are two verification processes: background verification and foreground verification. They work together to ensure data integrity. Background verification runs automatically, continuously checking the correctness of object data. Foreground verification can triggered by a user to more quickly verify the existence (although not the correctness) of object data.

Background verification automatically and continuously checks all Storage Nodes to determine if there are corrupt copies of replicated and erasure-coded object data. If problems are found, the StorageGRID system automatically attempts to replace the corrupt object data from copies stored elsewhere in the system. Background verification does not run on Archive Nodes.

The foreground verification process allows you to verify the existence of replicated and erasure-coded object data on a specific Storage Node, checking that each object that is expected to be present is there. You can run foreground verification on all or some of a Storage Node's object stores to help determine if there are integrity problems with a storage device. Large numbers of missing objects might indicate that there is an issue with storage.

You can look at the Nodes page for a Storage Node to review results from background and foreground verifications, such as corrupt or missing objects detected. You should investigate any instances of corrupt or missing object data immediately, to determine the root cause.

Steps

  1. Select Nodes.
  2. Select Storage Node > Objects.
  3. To check the verification results:
    • To check replicated object data verification, look at the attributes in the Verification section.
      Nodes > Storage Node > Object > Verification
      Note: Click an attribute's name in the table to display help text.
    • To check erasure-coded fragment verification, select Storage Node > ILM and look at the attributes in the Erasure Coding Verification table.
      Nodes > Storage Node > ILM > EC Verification
      Note: Click an attribute's name in the table to display help text.