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How to investigate StorageGRID lost objects (LSTOBJ)

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Applies to

  • NetApp StorageGRID 11.4
  • NetApp StorageGRID 11.3

Description

This KB will help you begin investigation into:

  • LSTOBJ AutoSupport incident
    • StorageGRID 11.4 and above report Object Lost Alert
    • StorageGRID 11.3 reports LOST (Lost Objects alarm)
  • Failure of the StorageGRID system to retrieve a copy of a requested object from anywhere in the system. Data might be permanently lost.

 

When do lost objects get reported and how does it work?

  • StorageGRID uses the location information in an object’s metadata to determine the location from which to retrieve the object.
  • If a copy of the object is not found in the expected location, the system attempts to retrieve another copy of the object from elsewhere in the system, assuming that the ILM policy contains a rule to make two or more copies of the object.
  • If this retrieval is successful, the StorageGRID system replaces the missing copy of the object.
  • Otherwise, the Objects lost alert and the LOST (Lost Objects) alarm are triggered, as follows:
    • For replicated copies, if another copy cannot be retrieved, the object is considered lost, and the alert and alarm are triggered.
    • For erasure-coded copies, if a copy cannot be retrieved from the expected location, the Corrupt Copies Detected (ECOR) attribute is incremented by one before an attempt is made to retrieve a copy from another location.
      • If no other copy is found, the alert and alarm are triggered.
  • Investigate all Objects lost alerts or LOST alarms immediately to determine the root cause of the loss and to determine if the object might still exist in an offline, or otherwise currently unavailable, Storage Node or Archive Node.
  • In the case, where object data without copies is lost, there is no recovery solution.
    • However, reset the Lost Object counter to prevent known lost objects from masking any new lost objects.

 

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