Object permanently unavailable

When the Archive Node requests an object from the Tivoli Storage Manager (TSM) server and the retrieval fails, the Archive Node retries the request after an interval of 10 seconds. If the object is permanently unavailable (for example, because the object is corrupted on tape) the TSM API has no way to indicate this to the Archive Node, so the Archive Node continues to retry the request.

When this situation occurs, an alarm is triggered in the StorageGRID Webscale system at Grid > ARC > Retrieve > Request Failures and the value continues to increase.

In some cases a retrieval fails because the object is temporarily unavailable. In this case, subsequent retrieval requests eventually succeed. If the object is permanently unavailable, perform the procedure Determining if objects are permanently unavailable to identify the object and manually cancel the Archive Node’s request. If the StorageGRID Webscale system is configured to use an ILM rule with only one active content placement instruction, copies of an object are not made. If an object is lost, it cannot be recovered; however, you must still perform the procedure Determining if objects are permanently unavailable to “clean up” the StorageGRID Webscale system, to cancel the Archive Node’s request, and purge metadata for the lost object. For more information about ILM rules, see the Administrator Guide.