The volume recovery tool is designed for an archive that is missing one or more studies due to an archive problem. The source of the problem could be that an entire piece of the archive has been lost or irreparably damaged.
The archive is missing some studies and the volume recovery tool is used to retrieve these studies back to the archive from other locations, such as hard disk caches or other archives. Studies that have no other locations in the system are not recoverable by the volume recovery tool.
For a non-clustered archive, the only location to recover studies from is the local image cache.
The volume recovery tool is independent of the type of problem archive media.
 | Note: Throughout the remainder of the document, the term recovered volume refers to the copy of the original damaged media provided by the data recovery service. |
How the volume recovery tool works
For studies that are unrecoverable or only partially recoverable, the volume recovery tool deletes those entries in the osr_location table that correspond to the unrecoverable objects on the volume, effectively erasing those archive locations. You are prompted with a warning message when the mark_affected_locations, recovery_attempt, and clean_up modes are run.
After the entries are deleted, the details of what was lost are available in the post-recovery assessment. This report provides information about all the studies that were fully recovered, partially recovered, and unrecoverable including the study_ref, study_uid, accession_number, patient_name, patient_id, modality, and station_name.
The recovery procedure consists of several tasks:
mark_affected_locations
The user specifies the locations or regions of the recovered volume that contain no data due to incomplete data recovery. The volume recovery tool determines which objects (images) were in these regions and marks them as in recovery.
pre_recovery_assessment
This step generates a report that lists the studies that were stored in the regions specified in the previous step and lists alternate locations for those studies, if any.
recovery_attempt
This step retrieves to the Archive Server the studies that have other locations in the system.
post_recovery_assessment
This step generates a report of recovered and unrecovered studies. The report includes study information such as the recovery status, accession number, patient name, modality, and number of objects.
clean_up
This step performs final database cleanup and triggers re-archiving of studies recovered by the volume recovery tool.
Running times
The time required for the volume recovery tool to execute the appropriate steps depends on the amount of study data to be recovered or deregistered and the speed of the database server.
Ensure you plan time during non-peak hours to use the volume recovery tool. It is database intensive and may adversely affect system performance and responsiveness if run during peak hours.