Data Migration

Services

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OFF-LINE STORAGE

At times migration projects require dealing with off-line media - disks or tapes in shelf storage - and the appropriate approaches are varied. Offline media include:

In many cases, the legacy PACS hardware can be used to read of-line media. Most straightforward is when an HSM manages the media, in which case there is usually a robotic library that can be loaded with batches of data and read under control of staging and extraction scripts run on the HSM. The HSM, which is designed to support multiple users sharing storage resources, usually manages resources contention with relative ease.

When the PACS application controls the drives and robotics directly, Rapid Migration tools must carefully manage the sharing of drive and robot resources without disturbing the running PACS. For some systems this cannot be done effectively, in which case a separate media reader must be used to read the disks or tapes. This is normally in the form of a drive or a small robotic library attached directly to the migration server. For reading collections of CD or DVD disk media, LAITEK uses a device that reads disks in stacks of 50, and can input 100 disks or more per day.

Media managed by the legacy PACS, whether through an HSM or direct-attached, contain information indexed by the PACS database, and usually do not significantly complicate the data reconciliation and cleanup processes, other than adding the labor of media handling. Manually-managed collections, on the other hand, typically have many discrepancies complicating RIS-PACS reconciliation. When manually-managed collections are to be brought on line in the new PACS, it is common to place them in a separate partition where needed individual cases can be found when needed, rather than investing a large effort to reconcile all of them up front.

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